1998 CADILLAC CATERA HEATER BLOWS OUT COLD AIR

  • Tiny
  • BordenL
  • 1998 Cadillac Catera

Heater problem
1998 Cadillac Catera 6 cyl Four Wheel Drive Automatic

What would make my heater blow out cold air? We have already replaced the thermostat.

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Monday, November 30th, 2009 AT 10:23 AM

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  • Tiny
  • factoryjack
  • Expert
  • 4,262 posts

You have a heater control valve that is in the rear of the engine, and somewhat difficult to access. There is a vacuum line going to it. You need to determine if vacuum is getting to that valve. I am not sure if it needs vacuum to let hot water flow to the core, or if no vacuum allows it to flow. It could also have a faulty diaphragm, and therefore be non-functional.

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Tuesday, December 1st, 2009 AT 9:57 PM
  • Tiny
  • 52xmax
  • Member

Did you figure out problem. I too have the same problem. I am told that the dash needs to come out and the acuaitor (sp?) Maybe bad. I hate this car.

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Wednesday, December 9th, 2009 AT 6:28 PM

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