Question about 1998 Oldsmobile Bravada

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I was told that I would need a compressor, an actuator, and a control head to remedy the constant heat flow in my 98 Bravada... Can you tell me the part name and or where I can purchase the control head

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  • Oldsmobile Master
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I've been dealing with this for a couple of weeks now on my 98 blazer. I have access to schematics and a scan tool which makes it a little easier. My experience has been with the automatic climate control system. I don't know very much about the manual control. There are several possible problems. The most likely, is that one of the gears in the blend door actuator is cracked. Therefore, the blend door is stuck in one position. The actuator CAN be accessed through the glove box but it is tight. On the left hand side you will see a vacuum controlled lever. That is for the defrost (if you turn the truck on and switch the vent position switch back and forth you will see it move). The blend door actuator is behind that so its easier to remove that vacuum diaphragm to gain access. The overdrive problem mentioned earlier could also be a problem. To reset this, turn the truck off, remove the RDO fuse for 30 seconds, replace the fuse, then turn the key to the run position. This will start a calibration cycle to reteach the computer where the maximum and minimum rotation points are so that it doesn't overdrive. If, after doing this procedure, the hvac system cycles back and forth from heat to cool there is probably a code set in the Climate control module  and it may be time to get a dealer with a scan tool involved. On my truck and at least one other truck I have found out about, the control module is unable to sense the location of the actuator door (that is what causes it to "overdrive"). You can verify if your module is over driving by removing the blend door actuator but leaving the electrical connector on. Turn the truck on, cycle to heat. The visible gear should rotate one direction then stop. Cycle to cool. The gear should rotate the other way and then stop. If it doesn't stop there may be something wrong with the control module. Good luck and hope this helps. Keep me posted, be glad to help. You can buy the part at Auto Zone or you can go to the Salvage Yard and pick one up for $20.00 and you can get a better understanding to how to remove the old one from a salvage Bravada, blazer, or jimmy of the same years.

Posted on Jun 20, 2009

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  • Expert
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Take your car to a shop that specializes in the car or heat and A/C systems. Get a GOOD diagnosis listing EXACTLY what part/parts will be needed and the cost to replace them, including labor.

Posted on Jun 20, 2009

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I need to know if there is an external heater control valve on the eatc unit in my 2003 grand marquis /


This vehicle does NOT use a heater control valve. Coolant flows to the heater core at all times. Temperature is regulated by the blend air door and blend door actuator. Locate the blend door. Remove the actuator and open the door by hand. If you get heat, the actuator or the control head is bad. FWIW, the actuator is the most likely cause

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2000 oldsmobile bravada heater control valve location


If you are looking for some sort of water valve that diverts water to/from the heater core, forget it. They don't exist anymore. They went away shortly after the widely adapted use of air conditioning in today's modern cars. Now, hot coolant is routed thru the heater core at all times, but is controlled by a cable-operated, or vacuum operated "blend door" located inside the heater box. If you are not getting heat to the vehicle, there are a few possible problems:

1. Bad thermostat - thus low coolant temperature and lack of heat.
2. Clogged heater core - no water flow thru core, thus no heat.
3. Broken control head - loss of cable or vacuum actuation of blend door.
4. Broken heater box/vacuum tank - no actuation of blend door.

Of the items listed above, based on the age of the vehicle and the likelihood of occurrence, I would investigate them in the order of 2, 4, 1, 3.

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2 Answers

No air blows out the dash vents hot or cold


if all your air or heat comes out of your defrost than the problem is more than likely your switch or a vacuum hose to the switch. Car's default to defrost when there is a problem. I can't recall off the top of my head but I do believe that vacuum controls the blend doors on the 98 Ranger. I can't quite remember but I think the white one is the main vacuum. Either way. pull out your heater switches, disconnect the rubbery plug with all the vacuum hoses, start the engine....1 of those should have constant vacuum, if not...chase it.....there will be 1 that goes through the firewall to the engine, the rest go to the blend doors.

Mar 29, 2015 | 1998 Ford Ranger

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It's a lot of work just to get at the diverter doors/actuators on the HVAC plenum under the dash, as they are near the center of the vehicle. Check YouTube to see a typical view (e.g. for a Blazer or Jimmy)..

Feb 09, 2018 | 1998 Oldsmobile Bravada

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How to test actuator on a 98 oldsmobile bravada


It's depends on which one your trying to check, most can be checked by unplugging harness connection ,then applying 12volts to the actuator. You'll probably hear a clicking or movement from that part

Oct 16, 2013 | 1999 Oldsmobile Bravada

1 Answer

My 98 olds bravada started blowing hot air even when the air and heat is turned off .....my heat and air both dont work now ..... any solutions?


Either the entire control panel has gone out or the door actuator motor has stuck or stopped working - real pain to change - behind the glovebox - has screws on top of actuator that are almost impossible without a swivel 1/4 wrench

Aug 22, 2010 | 1998 Oldsmobile Bravada

1 Answer

Climate control issues, heat stays on even when switch is off. What might the problem be?


98 olds. bravada. alternator and battery played out, so i installed both new ones easy money.the problem it created was my a/c damper door constantly opens and closes no matter what you turn the controls to. its working as far as the a/c but the air mix door want stay in the position it needs to stay in to keep getting cold air. i have checked every thing i possibly can. just so you know all was working perfect untill i had to put the battery and alternator on it. please help my truck gas mileage sucks,and the bravada is tolerable but cant its hot in va.

May 23, 2010 | 1998 Oldsmobile Bravada

2 Answers

Heater wont turn off. ac wont stay on


Sounds like either a blend door actuator fault, or a climate control head fault. Either way, you may have to get deep into the dash for repairs.

Hope it helps. Good Luck!

May 22, 2010 | 1998 Oldsmobile Bravada

2 Answers

I have a 98 olds bravada. i have it on ac but hot


Does the AC come on and stay on? If so it will be either in the heater control head or a blend door or blend door motor!

Aug 13, 2009 | 1998 Oldsmobile Bravada

1 Answer

Is the correct name for the part that controls the air flow from a/c to defrost called the A/C Heating Servo Unit, the defrost does not completely defrost the front windshield but the a/c works just f


Well it would be the "mode door GM pt#88986538" or the "mode control cam actuator GM pt#89023358" on the side of the heater case. The door would control where the air comes out and the actuator tells the door where the setting is at on the control head.

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