Question about 1998 GMC Jimmy

2 Answers

Heater or A/C only blows hot air....no temperature control.

I believe the problem is with the damper control motor or actuator located on the passenger side behind the glove box. However, it has been tampered with by someone else and I cannot determine what it should look like in its original condition. Where can I get pictures or drawings?

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  • Anonymous Apr 25, 2009

    I HAVE NO A/C THE HEATER BLOWS CONSTANTLY BECAUSE I WAS TOLD THAT THE TEMP. ACTUATER NEEDS TO BE REPLACED. THE DEALER HAS THEM FOR ABOUT $300 I WAS TOLD I COULD GET IT FOR LESS ON LINE. ANY SUGGESTIONS.

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You can get it from autozone or oriellys for $59 I just replaced mine and the air is blowinf fine. The actuator is keeping your compressor from coming on.

Posted on Jun 15, 2010

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Heat control motor behind glove box you have to take dash apart to replace or you can check fuse

Posted on Feb 01, 2009

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1 Answer

What caused heat to stop working?


same answer on all cars. nice photo, so rare here, shocking that.
in order,......
1: sure the blower must blow.
2: the engine must get to min. 180F , if not, thermostat bad in engine.
3: ok, engine is hot, so the heater core must get hot next. it has 2 hoses, we feel them with hands, are both hot?, yes, then the core is most-likely hot. (inside) (if not core is packed in gunk inside)
ever do 2year cooling flushes< (oops. zero service lands you here)
4: the controls must open the dampers, if not? bad controls
5: if the controls work and dampers fail, then the dampers are bad.


all answers assumes , cooling system full to top of RAD.
your car uses 3 damper motors. (electric)
that operate them by controls
the motor for temp is called temperature actuator motor.
the controller is called HVAC controller
did you scan the PLC to see if HVAC controller has errors.
the controller needs fuse 15 good. Cab fuse box ."hvac-rfa"
the controller use a network, data comm .
if you scan the PCM and it tells you the HVac comms are dead
what do you know? (means you cant fix it)
its not just a simple switch like in 1990 (gone)
its all computer controlled now.


26094348-k5quzreiqde4k1egefe3gt0o-2-0.jpg
check fuse first
scan 2nd.
like we do on all modern cars, or , its all just a guessing game.

Feb 14, 2016 | 2008 Suzuki XL7

3 Answers

1999 ford expedition , runs good doesn't overheat , but puts out no heat ?


heater core might need replaced . check the hoses going to it under the hood after it gets to operating temperature .One should be hot and the other not so much

Nov 19, 2015 | Ford Cars & Trucks

4 Answers

2004 Cadillac DeVille hot air blows out of passenger and rear vents when air condition is running


Does adjusting the passenger side temperature control on the dash have any effect?

Mar 29, 2015 | 2004 Cadillac Deville

1 Answer

2002 Jeep Liberty heater works, but defroster blows cold air


on all cars made
(you can read the FSM at any time and see exact way and tests)
1: damper stuck or its actuator bad. ( 3 kinds uses on all cars)
2 ;controls to damper actuator bad.
3: wires between both faulty.

3 types are motor, vacuum servo and cable.
you have 2 of the 3.
the blend is a motor actuator
the recric is vacuum servo
the motor types are very hard to test, read the FSM.

ill post the calibration

quote

Use this procedure to ensure that the A/C-heater control is correctly calibrated to the blend door actuator. If the calibration is not correct, the heating-A/C system may experience a condition where full heating or cooling capabilities cannot be obtained.
Manual calibration of the A/C-heater control should be performed if the blend door actuator is not functioning properly, or if the temperature of the conditioned air is too warm with the temperature control in the full cold position or too cool with the temperature control in the full hot position.
NOTE This calibration procedure can only be started within the first ten seconds after the ignition switch has been turned from the OFF position to the ON position. Make sure that the battery is fully charged prior to beginning the calibration procedure. NOTE The length of the pause made at each end of the temperature control rotation (sweep) is important. 5 seconds) or too long (greater than 1.5 seconds).
  1. With the ignition switch in the OFF position, move the temperature control to its middle (12 o'clock) position.
  2. Turn the ignition switch to the ON position (do not start the engine).
  3. Within 10 seconds of turning the ignition switch from the OFF to the ON position, perform the following rotations (sweeps) of the temperature control.
    • From the 12 o'clock position, rotate the temperature control counter-clockwise to the full cold position. Pause one second.
    • Rotate the control clockwise to the full hot position. Pause one second.
    • Rotate the control counter-clockwise to the full cold position. Pause one second.
    • Rotate the control clockwise to the full hot position. Pause one second.
    • Rotate the control counter-clockwise to the full cold position.

Oct 05, 2014 | 2002 Jeep Liberty

1 Answer

Air conditioner


sure.

what is your goal hot air, you never said,

got full fan speed? on high>? sure.
got full engine coolant heat 180F or more holding??? if not all is lost.
if car has a heater core water valve is it open>?
are the 2 heater core water tubes both fully hot,(hand test)
yes> good.
now you need air flow through the core (heater)
that means the damper most be open,, is it?

in that order. (heat)
the dampers on hondas can be complex. (10x on electric damper motors , aka, damper actuators)
see part 5 and 6 here
http://www.hondaautomotiveparts.com/auto/jsp/mws/prddisplay.jsp?inputstate=5&catcgry1=ACCORD&catcgry2=2002&catcgry3=2DR+EX&catcgry4=KA4AT&catcgry5=HEATER+UNIT

the fSM covers the complex tests of dampers, and not having
a real FSM makes this near impossible.
why , because your dampers are no like anyothers on earth.
other cars use different types. and are all unique .
unlike CABLES
unlike vacuum servos.
see>?

here are the basics for heat.
http://www.fixkick.com/AirCond/heater.html


Jun 04, 2013 | 2002 Honda Accord

5 Answers

My 1997 ford f150 heater will not blow hot air. i have replace the switch that controls the hot and cold air. i do not know what else to do. i do not heat any vacuum noise when i switch it to the heater or...


first, check under te hood to see if the heater core water hoses are hot going in and coming out. If hot going in but cold coming out, water valve (if you have one) may not be working.
------------------------------------------------------------------------------------------------
Control System Outputs
The air management doors are controlled by vacuum control motors (18A318) and an A/C electronic door actuator motor (19E616). The air inlet and distribution doors are controlled by vacuum control motors. The temperature blend door is controlled by the A/C electronic door actuator motor.
The A/C electronic door actuator motor provides a variable number of temperature blend door positions. Temperature control position energizes the A/C electronic door actuator motor moving the temperature blend door.
Vacuum control motors are used on both air distribution and air inlet doors. The air inlet and panel/defrost doors use a two position vacuum control motor. The floor duct/panel door uses a three position vacuum control motor. Vacuum control motors are controlled by engine vacuum through the climate control head.
For more information on the control components Section 412-04 .
-------------------------------------------------------------------------------------------------------------------------------------
Air Management Doors
The air management doors are controlled by vacuum control motors (18A318) and an A/C electronic door actuator motor (19E616). The air inlet and distribution doors are controlled by a vacuum control motor. The temperature blend door is controlled by the A/C electronic door actuator motor.
The A/C electronic door actuator motor provides a variable number of temperature blend door positions. Temperature control position energizes the A/C electronic door actuator motor moving the temperature blend door.
Vacuum control motors are used on both air distribution and air inlet doors. The air inlet and panel/defrost doors use a two position vacuum control motor. The floor duct/panel door uses a three position vacuum control motor. Vacuum control motors are controlled by engine vacuum through the climate control head.
-------------------------------------------------------------------------------------------------------------------
Section 412-04: Control Components - Climate Control 1997 F-150, F-250 Workshop Manual
REMOVAL AND INSTALLATION A/C Electronic Actuator
Removal
  1. Remove the floor duct panel.
    • Remove the two plastic push pins (one each side) and release the expander clip.
  1. Remove the RH instrument panel brace.
    1. Remove the lower nut.
    1. Remove the upper bolt.
    1. Remove the brace.
  1. Remove the LH instrument panel lower nut and position brace out of the way.
  1. Disconnect the vacuum harness from the vacuum actuator.
  1. Remove the floor duct.
    1. Remove the two screws (one each side).
    1. Remove the floor duct.
  1. Remove the panel/floor door vacuum control motor.
    1. Disconnect the vacuum line connector.
    1. Remove the two panel/floor door vacuum control motor screws.
    1. Slide the rod out of the door and remove the panel/floor door vacuum control motor.
  1. Remove the electronic actuator.
    1. Disconnect the electrical connector.
    1. Remove the three screws.
    1. Pull down to release the actuator shaft and remove the electronic actuator.

Jan 24, 2011 | 1997 Ford F150 Regular Cab

1 Answer

I have a 2005 Grand Cherokee Larado with manual temperature control of the heater output temperature. Regardless of the position of the heater temperature control, the heater discharge air temperature is...


Sounds like its the mixing door actuator motor. I believe its located behind your glove box, so if you remove your glove box you should be able to see it. Its a motor that actuates the mixing door to allow only hot, only cool, or a combination of the two into the vehicle. If you can get at it and the door seems to be able to move freely, you may want to check the heater control switch for voltage change using a multimeter. Im 99% sure it is one of these two culprits. Either the actuator motor or the switch. Good luck!

Mar 10, 2010 | 2005 Jeep Grand Cherokee

4 Answers

Climate controls


Car manufacturers use the defrost mode as a default for safety reasons. Being they want you to be able to defrost the windshield no matter what. So when something goes wrong the system automatically goes to the defrost mode. You most likely don't have the vacuum hose connected under the dash at the climate control assy. Or if this vehicle doesn't use the vacuum hose style you may have not plugged in one of the connectors under the dash or behind the climate control assy. Good luck.

May 21, 2009 | 1997 Lincoln Continental

1 Answer

1995 lincoln town car heater


the door opening & closing on Max a/c is the inside/outside air intake door.
The temp blend door is the one you are concernd about. It says you have to remove instrument panel for access. ouch!!!

-------------------------------------
A/C Electronic Door Actuator Motor
The A/C electronic door actuator motor (19E616) is located on top of the A/C evaporator core housing assembly.
  • Its function is to move the A/C air temperature control door on command from the control assembly.
  • The A/C electronic door actuator motor contains a reversible electric motor and a potentiometer. The potentiometer wiper is connected to the actuator output shaft and moves with the output shaft to indicate the position of the A/C air temperature control door.
  • Battery voltage is applied to the ends of the potentiometer. The voltage available at the wiper indicates the position of the potentiometer. The actuator wiper voltage is sent to the control module and matched with the wiper voltage of the module potentiometer. The printed circuit board then drives the actuator motor in the direction necessary to make the actuator wiper voltage agree with the control module wiper voltage.
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Dec 27, 2008 | 1995 Lincoln Town Car

1 Answer

2004 Pontiac Montana blows cold air in defrost


There is a mix damper inside your duct that controls the heat over heater core and ac evaporator that to your floor and one to your defrost. it is probable an electric actuator, that is not functioning properly. If yu can locate it and manually move it, you might have to remove the actuator motor first, you should be able to figure out your problem, I hope this helps! merry Christmas!

Dec 22, 2008 | 2004 Pontiac Montana

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