2005 GXP Overheating - Page 2 - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


Bonneville GXP/ Northstar Powered Cars Discuss your Bonneville GXP and/or any other Northstar powered Olds or Cadillac... Including the 3.5L Twin Cam V6 (Short Star ) 4.0L and 4.6L Northstar V8's. Please use General Chat for non-mechanical issues, and Performance and Brainstorming for improvements.

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Old 03-17-2017, 08:12 AM   #11
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Originally Posted by brad97 View Post
If it has overheated to the extent that is boiled out the coolant you may be in big trouble. Drastic overheating on a northstar engine will pull the head bolts out of the block. To repair this problem is a major and expensive job. The bolt holes have to be drilled out and threaded inserts installed. The engine/ trans should be dropped out of the car to do this. A mechanic will probably charge $2-3K to do this. You best hope this has not happened. The symptom is that on a long uphill climb all the coolant boils out.


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