Question about 1998 Oldsmobile Bravada

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I have a 1998 Oldsmobile bravada....just put new radiator, water pump, thermostat, radiator cap on and fluids are full....when i turn heat on....the ac automatically keeps kickin on causing me to only get "warm" heat out of heater....any clue?

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  • Oldsmobile Master
  • 8,518 Answers

The heater uses the compressor when you use the defrost setting to remove moisture from the air before it goes to the heater core. your controller may have lost it's adjustment and is turning the compressor on with floor heat. You would have to pull the control panel out to verify. Do you need instructions?

Posted on Oct 05, 2010

  • 8 more comments 
  • hgmccarren Oct 05, 2010

    Yes please and thank you.

  • Jeff Turcotte
    Jeff Turcotte Oct 05, 2010

    You will need an ohmmeter or other means of testing continuity in the mode switch.

    REMOVAL

  • hgmccarren Oct 06, 2010

    it is a sealed unit...only thing showing on the back is a row of pins on the back side....how exactly do i test it?

  • hgmccarren Oct 06, 2010

    it is a sealed unit...only thing showing on the back is a row of pins on the back side....how exactly do i test it?

  • hgmccarren Oct 06, 2010

    I have an ohmmeter to use

  • Jeff Turcotte
    Jeff Turcotte Oct 06, 2010

    OK, are all of the dials sealed or just the mode switch? If just the mode switch, here is a way: test the terminals in the connector socket. One will be hot when the key is on. The rest will be going to the clutch or a door actuator. Make sure there is resistance on each of the other terminals compared to ground. What I'm going to suggest is shorting the hot terminal to each of the others to see what it does, but I want to make sure none of them is a ground wire. If you find grounds, don't short the hot lead to them. Short it to the others and see what each one does. One of them is going to close the compressor clutch. Knowing that, all you need to do is put your ohmmeter between the switch terminals corresponding to the hot and the clutch terminals of the connector and go thru the selector settings as I previously described.

    If the entire unit (including fan speed and temp selectors) is sealed, this will be too difficult without the wiring diagram. Even now, I'm very unsure of what I'm telling you to do and I don't want you to damage your wiring. If we could find the pinouts for the unit, this would be easy. I will look for them.

  • hgmccarren Oct 06, 2010

    Ok, thank you

  • Jeff Turcotte
    Jeff Turcotte Oct 06, 2010

    no luck so far finding the pinouts. I did find the part online. You can get it for under $100, but I don't know if you need it yet. I did find a post with a similar problem, but it was over 2 years old. I sent the guy an email to see if he solved it, but don't even know if he still has that email address. This part may be a lot more complicated than I was hoping. If it has a circuit board inside, there is no way to predict what the ouputs should be with any given set of inputs on the switches. :o(

  • hgmccarren Oct 06, 2010

    well thank you for trying to help me out...i think we may just buy a new one ...its worth a shot and its something we can do fairly easy...thanks!

  • Jeff Turcotte
    Jeff Turcotte Oct 06, 2010

    I will let you know if that other guy get's back to me.

    Sorry I couldn't get this solved for you. :o(

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  • Oldsmobile Master
  • 5,332 Answers

Did you burp the system after you where done. The heater d-core is the highest place in the cooling system and will be the first to collect an air pocket. Running the vehicle at idle with the cap off will help purge the air out.

The a/c will turn on any time the mode switch is on defrost. When the heat selector is turned to hot the air will first go through the a/c evaporator core and then through the heater core. When the heat selector is turned to cold air will only go through the evap core. So regardless if the a/c compressor is on or not with the heat selector on hot it should blow hot air.

Did the heat work before you replaced the other parts?

If not than it is possible that the heater core is plugged. Especially if the coolant was really dirty before you started.

Posted on Oct 05, 2010

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