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ATC tempature sticking - 300M Chrysler Cars & Trucks

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  • ralph409 Nov 18, 2008

    99 300M heater sticks at desired temps above 75

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  • Chrysler Master
  • 21,949 Answers

Sounds like a new unit is required ,dealer only with you laying the golden egg ,could be sensor but i think more like the clima control computer.try running it in centigrade setting instead of obsolete farenheit ,it might confuse the computer and use a different circuit and work

Posted on Nov 18, 2008

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1 Answer

What is the difference between a ATC fuse and a ATM fuse ?


ATC Fuse
  • ATC fuses were created before ATM fuses. An ATC fuse will be larger than an ATM fuse in physical size. This is considered to be the regular size. An ATC fuse will be found in late-model electronic devices.
ATM Fuse
  • An ATM fuse is considered to be a mini fuse and it came out in the early 1990s. The only difference is it is smaller than an ATC fuse in actual size. It generally cannot be used in a fuse block that is made for an ATC fuse, as it will not fit in properly.

Apr 24, 2015 | 2002 Mazda Protege

1 Answer

2001 chrysler town and country. A\C heat Blowers will not work when controlled my front main pannel. It is a auto temp controlled system. The rear blower will work but no heat when controlled by the rear...


Hi,
This may be similar to what I just fixed on an '00 dodge:
http://www.dodgeintrepid.net/showthread.php?t=89711

Accessing the Integrated Diagnostic System:

Procedure for Automatic Temp Control (ATC) equipped vehicles:

With the engine ON and the vehicle stopped set the temp to 75*F. Next hold down the Floor, Mix and Defrost buttons until the ATC display begins to flash. While the display is flashing, the system will run it's tests and calibrations.

When the display stops flashing, the tests and calibrations are complete.

The ATC display can only display one error code at a time. Any stored codes can be scrolled through by pressing the Panel mode button once for each code. DO NOT press any other button or you will have to start the test over. Note the codes and refer to the list below to determine what system is malfunctioning.

List of Climate Control DTCs:
23: Blend door actuator feedback failure (bad servo)
24: Mode door actuator feedback failure (bad servo)
25: Ambient temp sensor failure
26: ATC In Car thermister failure (ATC only, bad ATC head or ATC head disconnected while battery is connected)
27: ATC in car sensor failure (ATC only)
31: Recirculation door actuator stalled (stuck door or bad servo)
32: Blend door actuator stall failure (stuck door or bad servo)
33: Mode door actuator stall failure (stuck door or bad servo)
34: Engine temperature message not received (ATC only, bad ATC head or bus failure)
35: Evaporator sensor failure
36: ATC control communication failure (bad ATC head or bus failure)
37: Blend door actuator output shorted to battery (bad servo or wiring fault)
38: Blend door actuator output shorted to ground (bad servo or wiring fault)
39: Mode door actuator output shorted to battery (bad servo or wiring fault)
40: Mode door actuator output shorted to ground (bad servo or wiring fault)
41: Recirculation door actuator output shorted to battery (bad servo or wiring fault)
42: Recirculation door actuator output shorted to ground (bad servo or wiring fault)
43: Common door shorted to battery (probable wiring fault, could be a servo that failed in an odd manner)
44: Common door shorted to ground (probable wiring fault, could be a servo that failed in an odd manner)
45: A/C control blend door input open or shorted with respect to ground (MTC only, wiring fault or bad servo)
46: A/C control blend door shorted to battery (MTC only, wiring fault or bad servo)
47: A/C switch failure (MTC only)
48: A/C control mode door input shorted to ground (MTC only, wiring fault or bad servo)
49: A/C control mode door input shorted to battery (MTC only, wiring fault or bad servo)
50: A/C control electric backlite (EBL) switch fails (MTC only)

51: System voltage too low for calibration!!! (check battery cables, battery and alternator!)

Dec 10, 2014 | 2001 Chrysler Town & Country

1 Answer

What tempature does the cooling fans come on


normally around 100deg C. buy a small hi-lo thermometer and sit it or stick it on the top of the radiator or top hose using a cable tie. it will record the highest temp achieved before the electric fan turns on

Sep 24, 2013 | 1998 Cadillac DeVille

1 Answer

My tempature gauge will register normal tempature after engine runs and heats up but will drop back to no tempature.


ZI suggest you have the engine thermostat replaced, it is likely sticking open and allowing the engine to cool down. The thermostat is under the cover that the upper radiator hose connects to on most GM engines.

Jul 24, 2012 | 2005 Chevrolet Silverado

1 Answer

The tempature gauge goes from back and forth from160 to 220 degrees when driving


Check your coolant level, but it sounds like a sticking thermostat to me.

Dec 19, 2011 | 1998 Pontiac Grand Prix

1 Answer

Tempature guage stays below cold & heater stopped blowing hot air


sounds to me like you have a thermostat that stuck open ,I recommend pulling the thermostat and inspect it for sticking open .you have got to have a engine that up to normal operating temp to get good heater performance

Dec 29, 2010 | 1999 Ford Explorer

1 Answer

What would make the atc fuse blow in a 1999 chevy blazer?


jai un blazer 2001 avec un probleme de fuse qui saute seule du atc elle saute sur la route lorsque le 4x4 es engager apres quelque minute de route jai changer lencoder le module atc tout verifier le filage a l'oiel et jai rien trouver quelquun peu maidee svp

Oct 30, 2009 | 1994 Chevrolet Silverado 2500

1 Answer

Fan runs for hours after car is off


Could be the tempature sensor that turns the fan on, or the fan relay may be sticking.

Oct 05, 2009 | 2001 Dodge Durango

1 Answer

The car keeps coming up a code 23 on a 1999 chrysler 300 for the


Code 23= Blend door feedback control


On cars with automatic climate control: To enter diagnostic mode, set the temperature to 75F, press the the off button. Press Floor, Defrost\Floor, Front Defrost simutaneously for 3 seconds until the temperature display begins to flash.
On cars without automatic climate control, set the blower to any speed, turn the temperature control in between warm and cold. Press Floor, Defrost\Floor, and Front Defrost. All codes will flash via the Front Defrost button.
When the test is over all fault codes will be displayed (on cars without automatic climate control, they will be blinked out on the Front Defrost button).
Code Action
23 Blend door feedback control
24 ATC mode door feedback failure
25 Ambient temperture sensor failure
26 ATC in-car sensor
27 Sun sensor failure
31 ATC recirculate door stall failure
32 ATC blend door failure
33 ATC mode door stall failure
34 Engine temperture sense failure
35 Evap temperature sense failure
36 ATC head command failure

Mar 23, 2009 | 1999 Chrysler 300M

2 Answers

Dont know if i should check transmission fluid with truck running


on your engine block your'll have a transmission fluid dip stick that you can use to check it.
please rate this thanks .

Mar 16, 2009 | 2000 Dodge Dakota Quad Cab

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