Replaced radiator,water pump,thermostat,recover tank,heater core,fan sensor,coolant sensor
Must be head gasket then
SOURCE: 96 Deville Overheating....TroubleShooting
did you run a compression check? if so and its good then you have a blockage in the water jacket
if not then you have a head gasket leaking
SOURCE: 1999 cadillac deville overheating
my husband did everything that everyone else did that had this overheating problem. It was so weird that my engine cooled at a light and heated up going down the road. I have a north star 4.6 engine and this is natorious for happening. my check engine light also came on and so I had a diagnostics done which told me my #1 injector wasn't firing , car ran like **** as well. After putting in a new water pump and plugs,ect. and realized injector was good a friend told him we could have a blown head gasket. So just to see if this was the problem I went to buy a bottle of glassbeads and the auto parts guy told us to purchase a bottle of BARS STOP LEAK BLOCK SEALER NOT RADIATOR BUT BLOCK SEALER $31.99 . He followed the directions and we waited 24 hrs. before driving it. What ever the problem was has stopped my car runs like brand new and I am loving it again. no over heating no injector problem, runs great.......I hope this helps. I know its probly a temperary fix but its a fix and now we know what the problem was. SASSY
SOURCE: no heat on my 98 caddy deville delegance?
The heater core may be clogged up. Or the blend door isn't functioning correctly.
SOURCE: 02 deville with 140k,overheats after
you may have too much coolant in it... oddly enough,. I've seen entire cooling systems (and even the engine get replaced) and it still over heated -- when in fact it was an all of a sudden the car required a larger radiator -- and the (freaky) problem was fully solved,. in your case it may be a larger holding/ overflow tank?
Best regards
Ck
SOURCE: 92 deville I've replaced heater core heater
Hello: ONE OTHER THING YOU MIGHT DO IS GO TO A AUTO PARTS STORE AND PURCHASE A SNIFFER KIT TO CHECK YOUR COOLING SYSTEM FOR EXHAUST GASES WHEN THE ENGINE IS AT OPERATING TEMPERATURE. THE KIT COMES WITH INSTRUCTIONS. IF YOU DON'T WANT TO BUY THE KIT MOST GARGES CAN PERFORM THE CHECK. A PRESSURE CHECK MAY NOT ALWAYS SHOW A LEAK OF A HEAD GASKET
Testimonial: "THANK YOU FOR THE INFO. I WILL GO GET THE TEST DONE THIS WEEK. DO U THINK IT WILL HURT TO DRIVE IT . IT HAS NOT OVER HEATED "
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