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Overheating problem - Deville

1116 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

The thermostat was not changed but radiator flush and manual purge was performed. I have not checked the water pump yet. I know I have a slight leak coming from one of the Rad valves But I can't tell if it's a bad hose or bad Rad. Idle What is going on with my car but it's really getting to me.
radiator flush and manual purge was performed.
don't know what manual purge is -

check the PURGE LINE for a constant gentle flow of coolant
with the engine running -
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