Question about 2004 Toyota Corolla

2 Answers

2004 Corolla LE, no heat, fan, a/c and ventilation is fine... the dash board control for heat and cold maybe malfunctioning... what's involved with fixing this ??

Posted by on

  • georgeil325 Nov 11, 2010

    well, what's involved with that ?? how much ??

    George

×

2 Answers

  • Level 3:

    An expert who has achieved level 3 by getting 1000 points

    Superstar:

    An expert that got 20 achievements.

    All-Star:

    An expert that got 10 achievements.

    MVP:

    An expert that got 5 achievements.

  • Toyota Master
  • 6,826 Answers

Maybe the vacuum motor is bad for switching to hot from cold.
If the heater core is not getting hot, then the heater core has to be either flushed out or replaced.

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.
Insufficient Defrosting CAUTION
Check all fluid levels and adjust as needed, before operating vehicle for extended periods at idle.
  1. Start the engine, select the DEFROST mode, and select the maximum blower speed. Does sufficient air flow from the defroster outlets? If yes, go to the next step. If there is insufficient airflow, go to step 9.
  2. Measure the engine operating temperature. Does the engine reach normal operating temperature (approx. 200° F)? If yes, go to the next step. If the engine does not reach normal operating temperature, go to step 7.
  3. Select the minimum blower speed. Select the warmest temperature setting. 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 10. If the hose temperature feels approx. the same, go to the next step.
  4. Test the operation of the A/C compressor clutch. Does the A/C compressor clutch engage? If yes, go to step 6. If the compressor clutch does not engage, go to step 5.
  5. Inspect A/C compressor clutch and controls. Repair or replace as needed, go to step 13.
  6. Determine if the A/C system is operating within specifications. If yes, go to step 8. If no, go to step 11.
  7. Check the low engine temperature problem. Repair any problems found, go to step 13.
  8. Inspect for correct operation of the recirculation door. If the door is operating correctly, go to step 13. If the door is not operating properly, go to step 12.
  9. Check air delivery system. Repair any problems found, go to step 13.
  10. Check the heater core for blockage. Repair or replace as needed, go to step 13.
  11. Check A/C performance. Repair or replace as needed, go to step 13.
  12. Repair the recirculation door concern. When the repair is complete, go to step 13.
  13. Operate the system in order to verify the repair. If the system is operating properly, the procedure is complete. If the system is still not providing proper defrosting, repeat the entire test.
---
HVAC Housing Components Removal & Installation Refer to the exploded view of the HVAC housing for removal and installation of the following components:
  • Blower Motor
  • Blower Motor Resistor
  • Cabin Air Filter
  • Damper Servo
  • Evaporator
  • Evaporator Thermistor
  • Expansion Valve
  • Heater Core
HVAC components 2004 Corolla LE, no heat, - toy_cor-10-00-1392.gif

Posted on Nov 12, 2010

  • Duane Wong
    Duane Wong Nov 12, 2010

    Try autozone.com for more information regarding your heater core diagnosing and replacement.

×

  • Level 3:

    An expert who has achieved level 3 by getting 1000 points

    Superstar:

    An expert that got 20 achievements.

    All-Star:

    An expert that got 10 achievements.

    MVP:

    An expert that got 5 achievements.

  • Master
  • 2,299 Answers

If it is the control in the dash the whole thing has to be replaced.

Posted on Nov 11, 2010

1 Suggested Answer

6ya6ya
  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

Hi,
a 6ya expert can help you resolve that issue over the phone in a minute or two.
best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
the service is completely free and covers almost anything you can think of (from cars to computers, handyman, and even drones).
click here to download the app (for users in the US for now) and get all the help you need.
goodluck!

Posted on Jan 02, 2017

Add Your Answer

Uploading: 0%

my-video-file.mp4

Complete. Click "Add" to insert your video. Add

×

Loading...
Loading...

Related Questions:

1 Answer

My corolla 2004 heat stucks in cold while starting


what sucks.? are you inside car or outside ,where?
is this a HVAC question, Heater ventilation and air conditioning>
or is this an engine question?

Dec 25, 2014 | 2004 Toyota Corolla

1 Answer

The Explorer starts fine, drives fine, but I have no power to the air fans, windows, odometer or any dash board lights or guages. Let's try again.


Given the number of circuits involved, I would start at the key switch to see if those circuits have power.

Feb 04, 2014 | 2004 Ford Explorer

1 Answer

I have a 2004 chevrolet trailblazer. It has dual heat select controls. The passenger side is blowing cold air when set to 'hot'. The driver's side seems to be responding normally. The dealer...


most likely the actuator is sticking which still can involve dash coming out but this should be around 700 dollars. try unhooking battery for a few minutes this will cause actuators to relearn positions and can free a sticking one

Sep 22, 2011 | 2004 Chevrolet TrailBlazer

1 Answer

Heater problem, 2 left front vents on dash board are blowing ice cold air + right 2 vents are blowing hot air. is this a possible dial setting/button problem or actual haeater problem. heat was set @...


Most likly this van has seperate controls for driver and passenger heat and ac controls.If its blowing hot air your heat is working.These controls operate differant dampers that are electonicly controlled.If the dials arent working they would cause this problem.

Feb 12, 2011 | 2004 Ford Freestar

2 Answers

When u turn temperature control knob theres a clicking sound in dash. we had heat and when we turned it to cold and back to heat with no heat and still clicking sound. what to do?


An actuator for the blend door may have popped off or broken. Involves tearing into the dash, usally around the passenger side of the dash board.

Mar 06, 2010 | 2002 Ford Explorer

3 Answers

Would the heater control valve malfunctioning make the engine overheat blowing hot air out the heater one moment,then not blowing the hot air, temp gage spikes 225 plus. The motor takes awhile to heat up...


Heater control valve malfunction will not cause engine to overheat unless coolant is leaking externally...Overheating going down the road can be the result of a few different things...Partly clogged radiator...Insufficient air flow due to possible fan problem...External coolant leak...Make sure fans are operting properly and have cooling system pressure tested for leaks...Gaining and losing heat on the inside of the vehicle usually means system is low on coolant but you must find out where coolant is going

Jan 06, 2010 | 2004 Chevrolet Impala

1 Answer

2004 sienna heating system problem. With the from heat control set to hot it sometimes blows hot and the cold air back and forth on its own with the heat set to hot?


try turning the blower down, if you have the fan on full you will feel cooler air from time to time. as the thermostat only measures the ambient tempreture inside the car when this level is met then it will turn off the heat so it will only blow the air from the car which will feel cooler.
if the car is still cold suspect the tempreture control in the car maybe faulty or the water level in the system maybe low.

Dec 02, 2009 | 2004 Toyota Sienna

1 Answer

No heat or air in 2004 Saab 9-3


Hi,
can you listen the ventilation fan working?
check fuse/ventilation fan engine

Dec 07, 2008 | 2004 Saab 9-3

1 Answer

Fan/AC


first check if the blower motor is going out. might be in the wiring as well as the control head.

Jul 11, 2008 | 1998 Dodge Ram 1500 4WD

Not finding what you are looking for?
2004 Toyota Corolla Logo

Related Topics:

785 people viewed this question

Ask a Question

Usually answered in minutes!

Top Toyota Experts

yadayada
yadayada

Level 3 Expert

75197 Answers

Colin Stickland
Colin Stickland

Level 3 Expert

22095 Answers

Jeff Turcotte
Jeff Turcotte

Level 3 Expert

7782 Answers

Are you a Toyota Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides

Loading...