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Hey guys. I have an over heating problem with my 97 deville...110k mi. Car starts to run hot when at a stand still(red light, traffic ect). Temp will drop back down under 200 once I get moving. It does get over 220 and climbing the longer I sit. I recently replace the radiator due to a leak.I also replace the thermostat and hoses. I replaced the water pump about a year ago. Coolant level is good...no leaks. I'm thinking fans. Is there a way to check them? I was told there are 3 relays that control them. Where are they located? I figure that would be my next step unless you guys have any other ideas. I can't use the car because of this problem. I really need to get it fixed. Appreciate any help as always....Jim

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I think the relays are between the fans. At least they used to be. The fans should always run with the A/C one. See if they do. Also check the belt tensioner and make sure that the condenser is not clogged with dead bugs restricting air flow.

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Sounds like something in the fan control circuit. With the car warmed up, let the engine idle and check to see if the fans come on.

I do not recall at what temperature the ECM calls for fan operation though.

Edited by KHE

'93 Fleetwood Brougham
'05 Deville
'04 Deville
2013 Silverado Z71

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The cooling fan relays will set codes if they are acting up, check to see if you have set codes

Also, my cooling fans motor was bad and just free wheeled, it turned but turned slowly

Pre-1995 - DTC codes OBD1  >>

1996 and newer - DTC codes OBD2 >> https://www.obd-codes.com/trouble_codes/gm/obd_codes.htm

How to check for codes Caddyinfo How To Technical Archive >> http://www.caddyinfo.com/wordpress/cadillac-how-to-faq/

Cadillac History & Specifications Year by Year  http://www.motorera.com/cadillac/index.htm

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Thanks for your reply. I did check and clean the condenser. I'll check the tensioner again. I replaced the serpentine belt a year ago.

You do realize that the water pump on the Northstar is not driven off the serpentine belt don't you? It's driven off a pulley on the left bank intake cam at the opposite end (rear)of the engine.

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