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About autohelp
Expertise
On hands professional expertise in all aspects of Cadillac diagnostics and repair mid 1970`s thru 2000 year vehicles. GM certified in electronic fuel injection, Automatic transmission, Heating and A/C, and onboard vehicle computer diagnostics.

Experience
Held over 15 GM certifications prior to retirement in 1989.

Organizations
Prior to retirement held several ASE certifications, numerous Factory certifications.

You are here: Experts > Shopping > Vintage Cars > Cadillac Repair > overheating

Cadillac Repair - overheating

Expert: autohelp - 10/24/2009

Question
my 96 caddy deville keeps overheating. have replaced the thermostat twice and bled the air out of the system. it will go for may be two weeks without overheating then overheats and all boils the antifreeze out of the overflow

Answer
This engine has a history of strpped head bolt threads in the aluminum engine block causing combustion pressure to get into the coolant chambers restricting the normal coolant flow.

You MUST drill out ALL the head bolt holes and install heli-coils and new head bolts in ALL the holes.

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