2000 Pontiac Grand Prix

TITLEIST777

MEMBER
2000 PONTIAC GRAND PRIX
6 CYL
FWD
AUTOMATIC
145,000 MILES

My 2000 grand prix doesn't have any heat. If I let it warm for 30 minutes, turn of the heat for 20 seconds and on it is warm for 5 seconds then gets cold. My first guess is the thermostat. But if that isn't the problem. What would it be?

Thursday, December 10th, 2009 AT 2:36 PM

5 Replies

JDL

MECHANIC
16,098 POSTS

Welcome to the forum, do you live in an extremely cold area, if so, you may need to use a block heater. Does the engine ever reach normal operating temp? Do both heater hoses get hot? My next step is to check the directional doors, see if they are operating like they should?

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Thursday, December 10th, 2009 AT 3:35 PM

TITLEIST777

MEMBER
4 POSTS

Yes, I live in Minnesota. I replaced the thermostat, and I still have the same problem. It feels like both hoses are getting hot, and my temp is fine. I have good heat if I shut it off for a minute and turn it on high, It works great for 10 seconds then gets cooler and cooler. I'll look into the directional doors. Do you think putting a piece of cardboard in front of my radiator would work? Thanks for all your help!

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Friday, December 11th, 2009 AT 11:03 AM

JDL

MECHANIC
16,098 POSTS

I have blocked off radiator on some of my old trucks, to get the heater to work better. You really need to be careful doing that, don't let the engine overheat!

If the problem is the directional doors, blocking the radiator won't help.

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Friday, December 11th, 2009 AT 12:41 PM

TITLEIST777