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2000 Cadillac Seville temporary heat

Tiny
THUNDER
  • MEMBER
  • 2000 CADILLAC SEVILLE
  • V8
  • FWD
  • AUTOMATIC
  • 97,000 MILES
Now that is getting cold, I notice that my heat (set @85 Deg.) Stays hot for about 30-40 mins then I get a cold blast of air as if the air conditioner automatically comes on. The only way that I can get heat back is to turn my temp guage to 90 Deg, then it gets too hot. What's the problem?
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Monday, December 8th, 2008 AT 1:09 PM

1 Reply

Tiny
BUDDYCRAIGG
  • MECHANIC
  • 2,262 POSTS
Ok thunder,
I’m going to jump in head first here.
But be advised that I *HATE* auto temp systems.
I refuse to make a customer spend $500 on a new heater control head because I "think" that is the problem.

A dedicated customer that I've had for 10 years came to me with a 96 nissan max with auto heater problems just this week.
I told him I wouldn't work on it.

After 4 hours at the Nissan dealership at $95 an hour, it turned out just being low on coolant.

Now knowing that these systems can be difficult to diagnose, do you want to keep going?
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Wednesday, December 10th, 2008 AT 1:42 AM

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