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1993 Cadillac Deville Heater Problem

Tiny
DEVILLE
  • MEMBER
  • 1993 CADILLAC DEVILLE
  • V8
  • FWD
  • AUTOMATIC
  • 78,765 MILES
Hi, I just tried to use my heater the other day and when I turned it up to 90 degrees the air comes out of the bottom cool, on the left defroster side it blows cool and on the right defroster side it blows hot. The AC works great. I never had this problem until this year. I checked and my anti freeze is full in the over flow and radiator. Do you have any idea what this could be. Thanks for any help you can give me, Joe
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Sunday, November 30th, 2008 AT 4:49 PM

1 Reply

Tiny
JAMES W.
  • MECHANIC
  • 2,394 POSTS
Joe, the cadillacs of this era are notorious for air lock in the heater core. If you have a bleeder on the thermostat housing you can open this with the engine at a warm idle and try to bleed the air out. Sometimes just driving for a while with the heat on high will force the air out.
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Sunday, November 30th, 2008 AT 9:00 PM

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