Question about 1996 Buick Roadmaster

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Heating system my 1996 roadmaster is not heating up ,i have replaced the door actuator,put in a new ambient air temperture sensor and this car has electronic climate control, any suggestions. nothing but cold air blows out even the temp.control is set 90 .

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  • cwj62 Jan 12, 2009

    what is a control head and what does it do? Yes the blend door moves freely with no problem

  • yadayada
    yadayada May 11, 2010

    the control head is most likely bad, u can have theis tested by any GM dealer, are u sure the blend door was free to move, u tested it after replacing the motor?

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It is the control module u set for heat/ac in the center of the dash, all the electronics are in side this module that do the switching and maintain the temp u set

Posted on Jan 12, 2009

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Why does my 1996 buick roadmaster have rough idling and missing?


I hate to be the bearer of bad tidings, BUT... it\'s obvious that these corrections you\'ve made [lots of $$$$$] have nothing to do with your problem.



Quite OFTEN idle and low speed engine performance problems are CAUSED by LEAKS in the VACUUM lines/system!!!!!



As a vehicle ages, summer heat, as well as engine heat, will cause the rubber or plastic of vacuum lines to deteriorate and either crack or become loose in their connection to nipples and tees in the vacuum system. This allows EXTRA AIR into the engine.



In the early stages of this process, the engine computer will be able to correct for the EXTRA AIR being sucked into the system.



However, as the air leakage increases with time and heat, the computer cannot fully correct, and thus engine performance suffers.



One fix is to replace all vacuum system components, BUT... that will COST HUNDREDS OF DOLLARS!!!!!



The way I have used to FIND vacuum leaks is to use a TINY PLUME of Propane from a small torch.



With the engine idling, gently open the Propane torch valve, "cracked" open just enough to be able to smell the Propane [DO NOT IGNITE/light the Propane, we only want a VERY small amount of gas, but NO FLAME!!!!!].



Then, apply the invisible tiny jet of Propane to EACH connection point in the vacuum system, while the engine is idling.



The engine idle speed [RPM] and sound should remain unchanged IF there is no leak at that connection.



HOWEVER, IF there IS a LEAK, the engine idle RPM and sound will change, and this is indicative of a leak at that point.



Once, when out of Propane, I substituted WD-40, and that worked also!



I suspect that any gas, either a combustible fuel gas, OR even a non-combustible gas would work because either would change the air [Oxygen] to vehicle fuel ratio, thus changing the idle RPM.

Sep 03, 2014 | 1996 Buick Roadmaster

2 Answers

Buick roadmaster problems


Check your fuse to your blend door actuator. If it's good your actuator's are not working.

Dec 16, 2013 | Cars & Trucks

1 Answer

Temperture control systems


Air Temperature Control Blend Door Failure

In all modern cars there is a tiny DC electric motor driven gear drive that moves a plastic door that blends heated and cooled air from the AC and the heater core, this is called (interestedly enough) the air temperature control blend door actuator. The motor that moves this door fails because the door starts sticking from warping, most common complaint is no heat but it can be no AC as well. To replace these parts (blend door and blend door actuator) you must remove the entire dash from the car. Always have this problem confirmed by a dealer or qualified repair shop as it is a very expensive repair.
Also try disconnecting the battery negative cable a few times for 5 minutes to see if the systems are just out of sync.

Oct 30, 2012 | 2003 Chevrolet Silverado 1500

2 Answers

Where is the blend door actuator located on 03 Hummer h2. Driver side blows cold, passenger side blows hot


They are not vac on the h2. there is 2 for temp control, one for recirc and one for blend. check the hummer forum as there is a great read for it there. the driver side actuator is really ez as it's under the glovebox, 20 min fix. the rest take removing the whole dash but it's not that tough.

Jan 10, 2012 | 2003 Hummer H2

1 Answer

Where is the air conditioning sensor. We were told it is under the dash and the whole dash has to be dismantled. We were also told there is more than one air conditioning sensor.This is big bucks and not...


The upper and lower duct sensors are divided into left and right zone operation. The left side upper and lower duct sensors will only effect the operation of the left air temperature actuator and the right side upper and lower duct sensors will only effect the operation of the right air temperature actuator. The duct sensors are used to measure the temperature of the air exiting the ducts.

The inside temperature sensor operates within a temperature range between -6.5°C (20.3°F) to 57.5°C (135.5°F) . If the sensor is shorted to ground, the system will operate in the maximum cooling mode. If the sensor is shorted to voltage or open, the system will operate in the maximum heating mode. The ambient sensor operates within a temperature range between-30°C(-22°F) to 51°C (123.8°F) . If the HVAC control module (IPM) has determined that the ambient air temperature sensor has failed, the IPM shall display "- -" in place of the ambient air temperature. If the sensor is shorted to ground, the system will operate in the maximum cooling mode. If the sensor is shorted to voltage or open, the system will operate in the maximum heating mode.

You are not makining sense when you replaced a P/S belt and A/C is now non op You need to know what the pressure is Leave the sensor alone the problem reside in the engine compartment

Jul 11, 2011 | Cadillac SRX Cars & Trucks

1 Answer

My 1996 passat is shutting off when the ambient temperture is hot, when is cool outside it starts fine but then as it warms up it shuts off. I purchased a new ignition switch but that didn't help.


the ambient temp. is reading more hight to ECU , ECU cut off . check sensor cable for short sercuit . try disconnected and check . note if disconnect mybe A/C not working ,

Jun 23, 2011 | 1996 Volkswagen Passat

3 Answers

Hello I'm having heat problemes. so far i flussed the system, still having no heat, Changed radiator and heatercor,Changed thermostat,Changed heat sensor,Now pleanty of heat acording to gage but still cold...


did you check the vacuum source of all heater controls inside the dash? maybe the actuating door valve has a leak due to an air line. also the selector mode switch could be bad

Feb 07, 2010 | 1995 Ford Windstar

1 Answer

How do I reset the outside temperture gauge


you can't reset it. Try replacing the sensor.

SECTION 412-04: Control Components 2002 Explorer/Mountaineer Workshop Manual
REMOVAL AND INSTALLATION Ambient Air Temperature Sensor Removal and Installation
  1. Remove the radiator grille. For additional information, refer to Section 501-08 .
  1. Remove the three upper pin-type retainers in the radiator air deflector.
  1. Position forward the air deflector.
  1. Remove the ambient air temperature sensor.
    1. Detach the pin-type retainer.
    1. Disconnect the electrical connector.
    • Remove the ambient air temperature sensor.
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Nov 23, 2009 | 2002 Mercury Mountaineer

1 Answer

Buick Roadmaster 1996 AC not working


The linear actuator that regulates the blend of air between hot and cold was broken and needed to be replaced. That was my suspicion. Fuses were all good. Relays were all good. Compressor pump cycled. Freon was "proper". Dealership only charged about $400 in parts and labor to confirm my guess.

May 07, 2009 | 1996 Buick Roadmaster

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

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