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Overheating problem - Deville

1119 Views 7 Replies 4 Participants Last post by  Maintenance101
So I have an 01deville and it has almost 100k on it. I bought it 2 months ago used and it started overheating after a week. Had the system purged manually and it worked fine.... for about three weeks. Then overheated again. Looked at coolant, it was about half a gallon low so I added some. Ran fine. Then I replaced the surge tank and it was good. Then today I parked it on a hill for not even 5 min. When I came out the DIC was going crazy. "Engine coolant hot- idle engine" "engine hot - ac off" "change engine oil" (which is weird considering I just changed the oil 3 weeks ago). There was No ac Running and I let the engine idle after backing the car down off the hill. "Engine overheated - stop engine" so I shut it off, let it cool down turned it back on. Drove a mile and a half and it overheated AGAIN. Had it towed home and here I am. Someone, anyone, ideas?
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Re: overheating problem

Was the hollowed bolt at the t-stat housing that feeds the surge line cleaned out when they replaced the surge tank? A new tank won't do any good if that line is still blocked with crud.

Oli life monitor goes to zero when the engine is overheated, it should be changed now.

Check the water pump pulley and belt for proper operation, maybe the rad, pressure cap and t-stat too.

Lots of pieces involved with an engine's cooling system that need to be working properly or chaos ensues.
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