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Old 09-16-2010, 07:22 PM   Thread Starter #1
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Default Heater Problem

I have an 05 with 103k miles.

Having a problem with my heater recently. I can not get any heat out regardless of where I set me temperature at. Have tried it with and without the AC on.

Watching the temp gauge and seeing it also fluctuate to be at the top of the range and then drop down.

Looking to see where I should start the investigation.

thanks
kjh
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Old 09-16-2010, 07:29 PM   #2
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Default Re: Heater Problem

Try with the AC Self-Check:


As promised here is a simplified version of the A/C self-diagnostics that
is much easier to understand than what I posted earlier.

A. Enter HVAC Self-Diagnostics Mode
1. Turn ignition switch to “ON”.
2. Within 10 seconds after starting engine
press “OFF” switch for at least 5 seconds.

B. Step B Does code #20 appear on the display 25 seconds after 2 appears
in the right side of screen?
IF Yes GO TO Step C.
IF No GO TO Step M.

C. Check operation of temp switch
1. Press top of driver side temperature switch
2. Does the temperature switch advance to self-diagnosis Step C?
IF Yes GO TO Step D.
IF No you have a malfunctioning temperature switch.
Replace A/C switch.

D. Check to return to self-diag Step B
1.Press bottom of driver side temperature switch.
2.Does the temperature switch return to self-diagnosis Step B?
If Yes GO TO Step E.
If No you have a malfunctioning temperature switch.
Replace A/C switch.

E: Mode Door And Intake Door Positions Checked
1. Press top of driver side temperature switch.
2. Does code #30 appear on the display 50 seconds after 3 is displayed in
right side of screen?
If Yes GO TO Step F.
If No GO TO Step N.

F. Check Operation of Actuators
1. Press top of driver side temperature switch.
2. Press DEF switch. Code Numbers. 41-46 will be displayed as each
actuator test is being conducted.
Checks must be made by listening to noise and feeling air flow from
outlets with your hand,.

G. Check Actuators
IF OK GO TO Step H.
If not OK Air outlet does not change.
Then Go to Mode Door Motor Circuit .
Intake door does not change.
Go to Intake Door Motor Circuit
Blower motor operation is malfunctioning.
Then Go to Blower Motor Circuit
Magnet clutch does not engage.
Go to Magnet Clutch Circuit
Discharge air temperature does not change.
Then Go to Air Mix Door Motor Circuit

H. Temperature of Each Sensor Checked
1. Press top of the driver side temperature switch.
2. IF Code No. 51 appears on the display Go To Step I.

I. Check Ambient Temperature Sensor
Press “DEF” switch one time. Temperature detected by ambient temperature
sensor is shown on the display
If temperature on display differs greatly from actual temperature, check
sensor circuit first and then inspect sensor.
If OK GO TO Step J.
If Not OK Check ambient sensor circuit

J. Check In Vehicle Sensor
Press “DEF” switch a second time. Temperature detected by in vehicle
sensor is shown on the display.
If temperature shown on display differs greatly from actual temperature,
check sensor circuit first and then inspect sensor.
If OK GO TO Step K.
If not OK Check In vehicle sensor circuit

K. Check Intake Temperature Sensor
Press “DEF” switch a third time. Temperature detected by intake sensor is
shown on the display
If temperature shown on display differs greatly from actual temperature,
check sensor circuit first and then inspect sensor.
If OK GO TO Step L.
If not OK Go to intake sensor circuit .

L. Check CAN Communications
1. Press “REC” switch.
2. CAN communication error between unified meter and A/C amp.
and Display Unit or Display Control Unit is detected.
If OK Turn ignition switch “OFF” or “AUTO” switch to “ON”.
The diagnostic procedure is complete.

M. Malfunctioning Sensor Codes
If two or more sensors are bad the corresponding codes blink respectively
twice.
Conduct Step B during daylight outside or have a bright light shine on
windshield or Code 25 will be indicated even though the sunload sensor is
good..

Code No. Sensor Malfunctioning
21 Ambient Temperature Sensor
22 In Vehicle Temperature Sensor
24 Intake Temperature Sensor
25 Sunload Sensor
26 Air Mix Door Motor PBR on driver side
27 Air Mix Door Motor PBR on passenger side

PLEASE DON'T TRY THIS IF YOU ARE NOT SURE HOW TO USE IT. I WILL NOT BE
RESPONSIBLE FOR ANY DAMAGE CAUSED BY USING THIS OR ANY ERRORS I MADE IN
DOCUMENTING THE PROCEDURE.
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Old 09-16-2010, 07:29 PM   #3
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Default Re: Heater Problem

Sounds like the thermostat
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Old 09-16-2010, 08:23 PM   #4
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Default Re: Heater Problem

Cant get heat because you might have low coolant, check you coolant level in your radiator and reservoir. Add more turn your car on and let it run. The coolant is what provides heat for the car via heater core. With low coolant you will have no heat and will also overheat the engine which is what you're experiencing now.
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Old 09-16-2010, 09:10 PM   #5
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Default Re: Heater Problem

Heater core could be plugged.
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Old 09-16-2010, 09:28 PM   #6
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Default Re: Heater Problem

had the same problem. go get your coolant flushed. most car washes have the machine to do it and it'll probably cost you $100.00. heres a question do you hear a swooshing or bubbling sound on you passenger side?
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Old 09-16-2010, 10:12 PM   #7
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Default Re: Heater Problem

Also check for air in the system which can also prevent the heat from working.
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Old 09-17-2010, 02:07 PM   #8
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Default Re: Heater Problem

flushing your system using the machine will remove all air bubbles
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Old 09-17-2010, 05:34 PM   #9
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Default Re: Heater Problem

Originally Posted by coryxavier View Post
flushing your system using the machine will remove all air bubbles
When you refill the system, get the front end jacked up...the air in the system will want to go to the highest point.
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Old 09-17-2010, 06:10 PM   Thread Starter #10
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Default Re: Heater Problem

thanks for the quick responses.
Did a flush and fill and back up and running. Heat is back.
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Old 09-17-2010, 06:19 PM   #11
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Default Re: Heater Problem

look at that!
Dont need no stinkin' mechanic/dealership, just ask the forum.
Great diagnosis guys!
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