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1998 Cadillac Catera Heater blows out cold air

Tiny
BORDENL
  • MEMBER
  • 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.
Monday, November 30th, 2009 AT 10:23 AM

2 Replies

Tiny
FACTORYJACK
  • MECHANIC
  • 4,159 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
  • 6 POSTS
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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