Yesterday drove my car about 25 miles everything worked fine. Then got back in my car after about 35 minutes, went to crank it and horn alarm went off. Turned off, restarted everything works fine except no power to the A/C or Heater. No readings, no fan, no air, nothing. Any ideas would be helpful. Thanks
Could be a fuse or the ac control module. I would check the fuse first.
SOURCE: I have a 1998 cadillac deville and the heater
If it blows cold, you have a couple of things that are possibilites. Either the heater core is bypassed, and there is no coolant going into it, or there is air in your cooling system. Also, you may have a blen door problem, where your blen door is not opening to allow the blower motor to push air through the heater core and out to your cabin.
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