Question about 1994 Buick Roadmaster

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Heater core replacement

My 1994 Buick Roadmaster blows cold air great but not hot air. I replaced the thermostat but still no heat. Is this likely the heater core? Where is it located on this car? Thanks in advance for any help.

Tom Gibbs

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  • Zafoo Oct 07, 2008

    I also have the same problem. It's like the climate controll is stuck in A/C mode. When I set the temperature to 90 degrees, I put my hand where the air vents are and it feels like a frigid 60 degrees still blowing. I don't believe it is the heater-core, if that were the case wouldn't the air coming from the vent's be of ambient temperature, instead of A/C processed freezing air. Please if anyone has any ideas, winter is around the corner.

  • timbo715 Nov 22, 2008

    my heat blows warm for a second then cold. need to remedy this soon and cheap.

  • bonniclyde Dec 12, 2008

    blows cold air replaced radiator, thermastat, still same problem! where is heater core located?

  • Anonymous Mar 17, 2014

    The blower in the car is great, the heater core was also replaced not long ago. I have no heat, blows cold out of all vents, and defrost.

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How do i change the stereo on my 1995 buick roadmaster?

Posted on Jul 23, 2009

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There is a air bleed valve on the side of the thermostat housing.make sure the system has been bleed of air or you won't have heat either.

Posted on Dec 22, 2008

OK, Ifound the problem with mine. Dont unplug your air dryer. I checked the 2 hoses coming out from the heater core and still one was hot and the other not hot. The top one comes from the radiator fill tank and the bottom one comes out of the core and goes around to the front and into the water pump. I disconnected both close to the core and could runwater through both directions so upon further examination, I disconnected the hose at the water pump and no water flow. The hose was plugged up with something. Once I cleared it with a hanger and reconnected it I had water flowing through the core and great heat. Hope this is your problem too as it is aneasy fix

Posted on Oct 23, 2008

THANKS FOR THE INFO AND i ALSO WILL PASS ALONG ANY NEW FIXES I DISCOVER
gibbsright@gmail.com

Posted on Oct 22, 2008

Thanks for the info. I will also keep pursueing solutions and keep you informed.
gibbsright@gmail.com
Tom Gibbs

Posted on Oct 22, 2008

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I talked with my cousin who knows vehicles and has extensive knowledge in electrical systems ( he deals with them on daily basis in his trade) . After speaking with him, reading info from Chilton's manual, and talking it over with some help full guys at Napa, the problem is leaning towards the actual digital control unit we see in our car. Something in the circuitry isn't making that connection telling the various rheostats or diodes or whatever diverting the coolant to the heater core while bypassing the a/c equipment ( or something like that). I am going to dive into my dash and pull the Temp. control unit out to see if it is something like a loose or burnt wire. However, I know by looking at the schematics of the wiring diagram that there are pressure switches and other things involved, so I'm not ready to ask Buick how much a whole new digital controller costs just yet. A possibility is to find one at a bone yard for a much cheaper price. Swap it out and see if anything happens. At least I won't be paying for a full price controller, because god knows what buick will want for it. If it works great, if not then I know to start looking into those pressure switches or rheostats or what have you.
If you decide to try the same your self be aware that the air bag system needs to be deactivated before you go digging into the unknown. There is an air bag fuse that needs to pulled and two wire harnesses that need to be disconnected. One for the drivers bag and one for the passengers. Disconnecting the battery ( which Chilton's instructs doing) I don't think will be enough. Those
connections might have constant power even with the vehicle turned of, in case of any impacts that arise from that situation.
I will try to keep you informed on my progress at my end. If you like you can contact me directly
at Zafoo@aol.com . Maybe we can this solved before our windshields start icing over.

Posted on Oct 21, 2008

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I had the same problem or still do. I disconnected the wires to the air dryer which stopped the compressor. That did solve the cold air problem and with a flush of the heater core I have warm air now. It is a quick fix till I can determine why the a/c wants to keep running

Posted on Oct 21, 2008

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