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97 cadillac deville

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zieman
Novice

Sep 10, 2010, 12:40 PM

Post #1 of 4 (2630 views)
97 cadillac deville Sign In
ihave 97 cadillac deville 4.6L northstar over heating problems changed thermostat new coolant still overheats 220 - 237 any body no what temperature the fans are supposed to come on . right now they are coming on at 221degrees


Sidom
Veteran / Moderator
Sidom profile image

Sep 10, 2010, 10:10 PM

Post #2 of 4 (2619 views)
Re: 97 cadillac deville Sign In
Is the water pump belt in good shape??

You know, that one in the back of the engine that runs the water pump that everyone forgets about checking.........Wink

Also that is the correct temp for the cooling fans to come on...............


mike zieman
User

Sep 11, 2010, 8:32 AM

Post #3 of 4 (2606 views)
Re: 97 cadillac deville Sign In
belt is good head gasket maybe is there a easy way to confirm no obvious signs


Sidom
Veteran / Moderator
Sidom profile image

Sep 11, 2010, 7:07 PM

Post #4 of 4 (2596 views)
Re: 97 cadillac deville Sign In
No real easy way to test those. They have a remote reservoir so chemical testing isn't always accurate, meaning it might pass an engine with a blown head gasket. But there are other things that could cause this problem. A restricted radiator. The impellers on the water pump worn down, a restriction in the block....

Did this problem start out of blue or were there some signs leading up to this????.....running a bit warmer?? Any coolant lose???

I realize you did look at the water pump belt but probably would've felt better if you said BOTH belts were good... The main serp belt & then the little water pump belt in the back that runs off the camshaft...





 
 
 






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