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The temperature on hvac unit isn't going up to target temperature

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Change thermostat on engine .

Posted on Jan 23, 2013

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1 Answer

My heater is not getting hot


Hello! There are only a few reasons for this awful event to occur in early December...Either Hot water isn't circulating through the heater core, the thermostat isn't opening or the door that directs heat is faulty...Is the temperature gauge showing normal? Next, is the upper radiator hose hot and hard? If the last two answers are yes then hot water is circulating...The unit that controls the doors ...ie...heat or defrost is called an Actuator...Also the lever that opens the heater may be at fault....LETS ELIMINATE...
Is there defroster heat? If no the heater core isn't opening ..If yes then the actuator is the culprit...You can check the heater by feeling of each of the two hoses that come through the firewall into the inside...If they are both hot then the heater core is open and functioning...If one is cold the heater isn't being opened by the temperature control..Or it is simply blocked with gunk....It's a 99 and getting old...I would suspect that IF the upper radiator hose is hot and hard and the temperature gauge is normal all is well with with most components and the next step is; Are both heater hoses hot...Your going to have to narrow this down for me to pinpoint the cause...See diagram below of the door actuator allowing defrost heat to be sent to the heater floor duct...
Send a comment with results and or observations...Remember"your my eyes and my hands"...Guru ...Saailer



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Dec 02, 2011 | 1999 Dodge Durango

1 Answer

Ac/and heater fan does not work . No lights on instruments


Hi, since the whole panel is dead, I would check the 40 amp HVAC BLOWER fuse under the hood. Please get back to me if either that isn't the problem or the fuse blows again.

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Jul 24, 2011 | 2002 Saturn L-Series

1 Answer

Where is the vacuum hose located in a 2004 Chevy trailblazer..it will go on feet an defrost..but wont come out of the front ones


If you're looking for vacuum hoses for the HVAC system, there are none. The HVAC air/temperature is controlled by doors and electric actuators. You may have a stuck door or bad actuator.

Jul 21, 2011 | 2004 Chevrolet TrailBlazer

1 Answer

I turned on the ac and the light does not work, the vents are not blowing and the car is running hot. I have a saturn SL 1996


First check the 15 amp HVAC fuse located in the main fuse block inside the car on the passenger side of the center console, under a cover. If the fuse is good, then the problem may either be the HVAC blower switch (which is the fan blower selector switch), the fan blower motor resistor, or the fan blower motor. An auto repair manual will explain and illustrate for you the steps on how to check each of these components.

Even after pushing the ac light switch on, the fan blower selector switch has to be turned on as well (working) because it provides an electrical path to the positive side of the battery to complete the circuit and turn the ac light on. What the ac light switch does is provide the electrical path for the ac compressor clutch to come on through the ac control relay which is controlled by the car's PCM(computer) when you want ac, but the ac light switch still needs to run through the fan blower selector switch to receive its power. You can turn on the fan without the ac light switch because it gets its ground path(negative) from the blower motor. So the blower motor has to work in order to provide a ground path for the fan blower selector switch to be functional. You could have a faulty blower motor which is why no air blows through the vents. The fan blower motor is located inside the car on the passenger side underneath the dash at the bottom end of the glove compartment box. You'll see it. It's right above where a person rests their feet on the floor. Therefore, if your 15 amp HVAC fuse is good, check to see if you have voltage at the blower motor connector. Unclip the connector and with the ignition on and the fan blower switch moved to any one of the first 3 selections, check for voltage using a multimeter. The voltage will vary because there is a blower motor resistor. Voltage should be higher on setting 3 than 1. If you do have voltage at the blower motor connector, check for a faulty blower motor. The auto repair manual will tell you how to do it using jumper wires.

It's normal that your car is running hot because the radiator fan works in conjunction with your ac compressor. If the ac is on, the radiator fan will be on and therefore the engine coolant temperature will stay in it's normal operating range. If the ac is off, the radiator fan will stay off as well and the engine coolant temperature gauge will begin to rise and show pretty hot (especially at idle). It will do this up until a certain degree then the radiator fan should turn on thermostatically and stabilize the temperature. It's scary and I know what your saying because it does that to my car if my ac isn't on. Don't worry it won't overheat.

May 29, 2011 | 1996 Saturn SL

1 Answer

A/c blows cold on one side an hot on the other


To figure out anything at all on a Lincoln LS,because it is
one of Fords most complicated and all electronic vehicles,
(I own One) you need a professional scan tool and the factory
diagnostic manuals or a similiar data base, to do anything at all,
when something doesn't work correctly.

I would NEVER recommend a dealer for any vehicle ever

If you have thousands to spend,your call

That leaves the local repair shops & they don't all care
for Ford Products.
I don't know about the LS & newer Lincolns,but it won't
be a quick fix,as it will be extremely time consumming
just to find the issues at the repair shop you choose

Then your going to get told it is okey or they couldn't find
anything or did do something, that won't last

I could have painted a very positive picture,but I want you
to know todays vehicles are very difficult to diagnose &
mainly there isn't too many mechanics or shops that are
going to do the difficult job of training & self study

You may get a better more technical answer in a couple
days by a tech who know more about the HVAC System
and your issue

Apr 26, 2011 | 2002 Lincoln LS

1 Answer

The heat in my 2006 grand prix will not get hot. We replaced the thermostat and got nothing. So I got the radiator flush and force filled again. Still nothing. Temp of the motor still gets to the middle,...


Are the 2 tubes that go to the heater core getting hot? If so, then the blend door is not opening to allow heat to get to the cabin.

Possible vacuum motor problem, either disconnected, or the controller for the blend door is broken is likely problem.

Troubleshooting by Symptom Poor Heater System Performance CAUTION
Check all fluid levels and adjust as needed, before operating vehicle for extended periods at idle.
  1. Start the engine.
  2. Idle the engine until the thermostat opens (upper radiator hose will be hot) Is the engine at normal operating temperature (approx. 200° F)? If yes, go to the next step. If no, go to step 16.
  3. Set the mode selector to FLOOR mode.
  4. Set the heater control selector to the warmest temperature setting.
  5. Set the blower speed the lowest setting.
  6. Carefully feel the inlet and outlet heater hoses at the heater core. Is the inlet heater hose significantly hotter than the outlet heater hose? If yes, go to step 14. If no, go to the next step.
  7. Set the mode selector to PANEL mode.
  8. Select the maximum blower speed.
  9. Select the warmest temperature setting.
  10. Place a thermometer into the center I/P PANEL air outlet and affix a second thermometer to the heater core outlet heater hose.
  11. Record the temperature at the center I/P PANEL air outlet and at the heater core outlet heater hose. Are the two temperature readings about equal? If yes, go to the next step. If no, go to step 13.
  12. Inspect and repair the cowl, cowl area, recirculation door, and the HVAC evaporator/heater core case for cold air leaks. Repair any problems found, go to step 17.
  13. Inspect the temperature door operation. Repair any problems found, go to step 17.
  14. Turn OFF the engine. Back-flush the heater core. Start the engine. Select the FLOOR mode and the lowest blower speed. Select the warmest temperature setting. Feel the temperature of the inlet and outlet heater hoses at the heater core. Is the inlet heater hose feel significantly hotter than the outlet heater hose? If yes, go to the next step. If no, go to step 17.
  15. Replace the heater core. When the repair is completed, go to step 17.
  16. Check for low engine temperature problems, Repair or replace as needed, go to step 17.
  17. Operate the system in order to verify the repair. If the system operates properly, the repair is complete. If the heater still does not work properly, repeat the entire procedure.
Air Door Actuators/Motors Removal & Installation Recirculation Actuator To Remove:
  1. Remove the right lower instrument panel (I/P) insulator.
  2. Remove the glove box assembly. Recirculation actuator (Typical) gm-10-00-3695.gif

  3. Remove the mounting screws and recirculation actuator from the HVAC module assembly.
  4. Disconnect the recirculation actuator harness connector.
To Install:
  1. Align the recirculation actuator slots with the flats on the actuator door shaft.
  2. Install and secure the recirculation actuator on the HVAC module assembly with the mounting screws.
  3. Connect the recirculation actuator harness connector.
  4. Install the glove box assembly.
  5. Install the right lower I/P insulator.
  6. Calibrate the recirculation actuator.
Mode Actuator To Remove:
  1. Remove the right lower instrument panel (I/P) insulator.
  2. Remove the glove box assembly. Mode actuator gm-10-00-4356.gif

  3. Remove the mounting screws and mode actuator from the HVAC module assembly.
  4. Disconnect the mode actuator harness connector.
To Install:
  1. Align the mode actuator slots with the flats on the actuator door shaft.
  2. Install and secure the mode actuator on the HVAC module assembly with the mounting screws.
  3. Connect the mode actuator harness connector.
  4. Install the glove box assembly.
  5. Install the right lower I/P insulator.
  6. Calibrate the mode actuator.
Air Temperature Actuator Right Side To Remove:
  1. Remove the right lower instrument panel (I/P) insulator.
  2. Remove the glove box assembly. Air temperature actuator (right side) gm-10-00-4356.gif

  3. Remove the mounting screws and right air temperature actuator from the HVAC module assembly.
  4. Disconnect the right air temperature actuator harness connector.
To Install:
  1. Align the right air temperature actuator slots with the flats on the actuator door shaft.
  2. Install and secure the right air temperature actuator on the HVAC module assembly with the mounting screws.
  3. Connect the right air temperature actuator harness connector.
  4. Install the glove box assembly.
  5. Install the right lower I/P insulator.
  6. Calibrate the mode actuator.
Left Side To Remove:
  1. Remove the left lower instrument panel (I/P) insulator. Air temperature actuator (left side) gm-10-00-4357.gif

  2. Remove the mounting screws and left air temperature actuator from the HVAC module assembly.
  3. Disconnect the left air temperature actuator harness connector.
To Install:
  1. Align the left air temperature actuator slots with the flats on the actuator door shaft.
  2. Install and secure the left air temperature actuator on the HVAC module assembly with the mounting screws.
  3. Connect the left air temperature actuator harness connector.
  4. Install the left lower I/P insulator.
  5. Calibrate the mode actuator.

Oct 18, 2010 | 2006 Pontiac Grand Prix

1 Answer

Ac blowing heat on side and air on the other side.


Air Door Actuators Removal & Installation Console Mode To Remove:
  1. Remove the center console from the vehicle.
  2. Detach the air outlet duct from the center console.
  3. Disconnect the console mode actuator connector.
  4. Detach the console mode actuator from the center console.
To Install:
  1. Attach the console mode actuator to the center console. Torque the screws to 17 in-lb (1.9 Nm).
  2. Connect the console mode actuator connector.
  3. Attach the air outlet duct to the center console. Torque the screw to 17 in-lb (1.9 Nm).
  4. Install the center console into the vehicle.
Left Side Air Temperature To Remove:
  1. Remove the instrument panel carrier from the instrument panel.
  2. Disconnect the left side air temperature actuator connector. HVAC control module - left side gm-10-00-1844.gif

  3. Detach the left side air temperature actuator from the HVAC module.
To Install:
  1. Attach the left side air temperature actuator to the HVAC module. Torque the screw to 17 in-lb (1.9 Nm).
  2. Connect the left side air temperature actuator connector.
  3. Install the instrument panel carrier onto the instrument panel.
  4. Recalibrate the left side air temperature actuator.
Right Side Air Temperature To Remove:
  1. Remove the instrument panel carrier from the instrument panel.
  2. Disconnect the right side air temperature actuator connector.
  3. Detach the right side air temperature actuator from the HVAC module.
To Install:
  1. Attach the right side air temperature actuator to the HVAC module. Torque the screw to 17 in-lb (1.9 Nm).
  2. Connect the left side air temperature actuator connector.
  3. Install the instrument panel carrier onto the instrument panel.
  4. Recalibrate the right side air temperature actuator.
Mode To Remove:
  1. Remove the left floor duct from under the instrument panel (I/P).
  2. Disconnect the mode actuator connector. HVAC control module - left side gm-10-00-1844.gif

  3. Detach the mode actuator from the HVAC module.
To Install:
  1. If installing a new mode actuator, move the mode door to the middle position.
  2. Attach the mode actuator to the HVAC module. Torque the screw to 17 in-lb (1.9 Nm).
  3. Connect the mode actuator connector.
  4. Install the left floor duct under the instrument panel (I/P).
  5. Recalibrate the mode actuator.
Defrost Valve To Remove:
  1. Remove the instrument panel carrier from the instrument panel.
  2. Disconnect the defrost valve actuator connector. HVAC control module - left side gm-10-00-1844.gif

  3. Detach the defrost valve actuator from the HVAC module.
To Install:
  1. Attach the defrost valve actuator to the HVAC module. Torque the screw to 17 in-lb (1.9 Nm).
  2. Connect the defrost valve actuator connector.
  3. Install the instrument panel carrier onto the instrument panel.
Recirculation To Remove:
  1. Remove the HVAC module from the instrument panel.
  2. Detach the air inlet assembly from the HVAC module. Recirculation actuator removal and installation gm-10-00-1845.gif

  3. Disconnect the recirculation actuator connector.
  4. Detach the recirculation actuator from the HVAC module.
To Install:
  1. Attach the recirculation actuator to the HVAC module. Torque the screw to 17 in-lb (1.9 Nm).
  2. Attach the air inlet assembly to the HVAC module. Torque the screw to 17 in-lb (1.9 Nm).
  3. Connect the recirculation actuator connector.
  4. Install the HVAC module into the instrument panel.
  5. Recalibrate the recirculation actuator.
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Aug 17, 2010 | 2004 GMC Envoy

2 Answers

I changed the battery on 2006 Trailblazer SS. Now I can only get AC from my windshield and floor vents. Nothing from the dash vents. Also the temp control only gives coldest temp. I have checked fuses...


once you disconnect the battery your body control module loses power and memory you have to get some one with a scanner with reprogramming capabilities and have the computers reset ,dealer?

Aug 05, 2010 | Chevrolet TrailBlazer Cars & Trucks

1 Answer

I have a 1999 Chevy Malibu and the AC turns from inside air output to outside output on it's own. You can push the inside air button and it will go back and then in a second or two it will go back to the...


Yes , the Refrigerant level is good , I would say the control panel is bad , or there is a problem with HVAC Air Delivery/Temperature Control Circuit Description
The vacuum actuators move the air valves in the HVAC system (except the temperature valve). Vacuum is applied to the actuators through the mode selector in the heater A/C control assembly. The mode selector consists of a rotary vacuum switch. The rotary vacuum switch supplies vacuum to the vacuum actuators according to the operating mode selected by the driver. A small servo motor moves the air temperature actuator. The small servo motor positions the door according to the voltage level from the temperature selector in the heater A/C control assembly. The temperature selector is a potentiometer positioned by the temperature control knob on the front of the heater A/C control assembly.
Air Temperature Actuator
When the ignition switch is in the RUN position, battery voltage is applied to the air temperature actuator. The actuator receives ground at all times through the following components:
• CKT 251
• Ground G204
The temperature selector is a potentiometer with a wiper arm. The wiper arm is electrically tied to the air temperature input through CKT 733.
When the temperature selector is moved between COLD and HOT, voltage to the control input varies between 1 and 12 volts. The temperature valve motor solid state circuitry performs the following tasks:
• Looks at the control input voltage
• Moves the motor to correspond to the control input voltage
The temperature valve moves for the following reasons:
• In order to allow the air to pass through the heater core
• In order to allow the air to pass around the heater core
This control achieves the desired passenger compartment temperature.

HVAC Air Delivery System Check
Step
Action
Yes
No
1
Start the engine.
Turn the blower motor fan ON and select an air outlet mode.
Does air flow out of the selected HVAC outlet ducts?
Go to Step 3
Go to Step 2
2
Did the customer concern mention that the air discharges out the correct ducts at first, but then changes during higher engine RPM?
Go to Step 7
Go to Step 3
3
With the engine running, cycle the HVAC controls through all the modes.
Does the air come out of the selected outlet ducts?
Go to Step 18
Go to Step 4
4
With the engine running, take a vacuum reading at the manifold vacuum port that supplies vacuum to the HVAC vacuum control assembly.
Is there engine vacuum?
Go to Step 6
Go to Step 5
5
Repair the no vacuum condition.
Is the repair complete?
Go to Step 18
--
6
Take a vacuum reading at the vacuum supply line at the HVAC vacuum control assembly.
Is the vacuum reading the same as the engine vacuum?
Go to Step 11
Go to Step 8
7
Disconnect the vacuum supply line from the HVAC vacuum control assembly.
With the vacuum gauge connected to the vacuum supply line, re-start the engine and turn the engine OFF.
Does the system lose vacuum after turning OFF the engine?
Go to Step 8
Go to Step 11
8
Inspect for leaking or collapsed vacuum lines between the engine manifold vacuum port and the HVAC vacuum control assembly.
Are the vacuum lines leaking?
Go to Step 9
Go to Step 10
9
Repair or replace the collapsed or leaking vacuum line.
Is the repair complete?
Go to Step 18
--
10
Replace the vacuum reservoir tank.
Is the repair complete?
Go to Step 18
--
11
Using an external vacuum source, apply vacuum to the appropriate vacuum line at the connector to the HVAC vacuum control assembly.
Does the actuator retract?
Go to Step 17
Go to Step 12
12
Inspect for leaking or collapsed vacuum lines between the actuator and the connector to the HVAC vacuum control assembly.
Are the vacuum lines leaking?
Go to Step 9
Go to Step 13
13
Disconnect the vacuum line from the actuator.
Apply an external vacuum source to the actuator.
Did the actuator retract?
Go to Step 14
Go to Step 16
14
With the actuator disconnected, inspect the door for binding.
Does the door move freely?
Go to Step 16
Go to Step 15
15
Repair the appropriate binding door.
Is the repair complete?
Go to Step 18
--
16
Replace the appropriate vacuum actuator.
Is the repair complete?
Go to Step 18
--
17
Replace the HVAC vacuum control assembly.
Is the repair complete?
Go to Step 18
--
18
Cycle the HVAC controls through all modes to verify proper operation.
Did you correct the condition?
System OK
--

Apr 05, 2017 | 1999 Chevrolet Malibu

1 Answer

How to install ac mode actuator on 2003 gmc sierra


prev.gif next.gif Air Door Actuators Removal & Installation Air Temperature Actuator Air Temperature Actuator Replacement gm-10-00-559.gif

To Remove:
CAUTION
Do not apply power to the actuator when it is removed from the HVAC module.
  1. Remove the instrument panel hush panel.
  2. Disconnect the connector from the air temperature actuator.
  3. Remove the air temperature actuator mounting screws.
  4. Remove the actuator from the HVAC assembly.
To Install:
  1. Position the air temperature actuator on the HVAC assembly.
  2. Install the actuator mounting screws.
  3. Install the electrical connect to the air temperature actuator.
  4. Install the instrument panel hush panel.
Right Side Air Temperature Actuator (2003-2007) Right Air Temperature Actuator Replacement gm-10-00-560.gif

To Remove:
CAUTION
Do not apply power to the actuator when it is removed from the HVAC module.
  1. Remove the instrument panel carrier.
  2. Disconnect the connector from the right air temperature actuator.
  3. Remove the actuator mounting screws.
  4. Remove the right air temperature actuator.
To Install:
  1. Position the right air temperature actuator on the HVAC assembly.
  2. Install the actuator mounting screws.
  3. Connect the electrical connector to the actuator.
  4. Install the I/P carrier.
  5. Calibrate the actuator.
Left Side Air Temperature Actuator (2003-2007) Left Air Temperature Actuator Replacement gm-10-00-561.gif

To Remove:
CAUTION
Do not apply power to the actuator when it is removed from the HVAC module.
  1. Remove the I/P insulator panel.
  2. Disconnect the connector from the left air temperature actuator.
  3. Remove the actuator mounting screws.
  4. Remove the left air temperature actuator.
To Install:
  1. Position the left air temperature actuator on the HVAC assembly.
  2. Install the actuator mounting screws.
  3. Connect the electrical connector to the actuator.
  4. Install the I/P insulator panel.
  5. Calibrate the actuator.
Mode Actuator Mode Actuator Replacement gm-10-00-562.gif

To Remove:
CAUTION
Do not apply power to the actuator when it is removed from the HVAC module.
  1. Remove the floor air outlet from the floor duct.
  2. Remove the center console and center console duct (if equipped).
  3. Disconnect the electrical connection at the mode actuator.
  4. Remove the mode actuator mounting screws from the HVAC module.
  5. Remove the mode actuator with the actuator cam attached.
To Install:
  1. Position the mode actuator with the actuator cam to the HVAC module.
    • Align the heater/defroster valve lever with the cam slot
    • Align the A/C valve lever with the cam
  2. Install the mode actuator mounting screws.
  3. Connect the mode actuator electrical connection.
  4. Install the center console duct and the center console (if equipped).
  5. Install the floor air outlet duct extension to the floor air duct.
  6. Calibrate the actuator.
Air Inlet Actuator/Recirculation Actuator Delphi Recirculation Actuator Replacement (Delphi) gm-10-00-564.gif

To Remove:
CAUTION
Do not apply power to the actuator when it is removed from the HVAC module.
  1. Remove the instrument panel upper trim panel.
  2. Remove the instrument panel lower trim panel and glove box assembly.
  3. Remove the passenger side air bag.
  4. Disconnect the connector from the recirculation actuator.
  5. Remove the recirculation actuator mounting screws.
  6. Remove the recirculation actuator from the HVAC assembly.
To Install:
  1. Position the recirculation actuator on the HVAC assembly.
  2. Install the recirculation actuator mounting screws.
  3. Connect the electrical connector to the recirculation actuator.
  4. Install the passenger side air bag.
  5. Install the instrument panel lower trim panel and the glove box assembly.
  6. Install the instrument panel upper trim panel.
  7. Calibrate the actuator.
Visteon Recirculation Actuator Replacement (Visteon) gm-10-00-566.gif

To Remove:
CAUTION
Do not apply power to the actuator when it is removed from the HVAC module.
  1. Remove the HVAC module assembly.
  2. Remove the evaporator core cover from the HVAC module.
  3. Remove the recirculation actuator from the HVAC module assembly.
To Install:
  1. Position the recirculation actuator on the HVAC assembly.
  2. Install the recirculation actuator mounting screws.
  3. Install the evaporator core cover to the HVAC module.
  4. Install the HVAC module assembly.
  5. Calibrate the actuator.
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Jul 09, 2010 | 2000 GMC New Sierra 1500

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