Question about 1999 Cadillac DeVille
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Posted on Jan 02, 2017
have you checked you fueses and relays?
the coolant sensor is located Under hood, driver side, rear engine area, mounted on intake manifold
Posted on Oct 27, 2008
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
Posted on Mar 19, 2009
The BLOWER MODULE is located on the A/C EVAPORATOR housing located UNDER THE HOOD passenger side firewall. Has 2 electrical connectors. Mounted with 4 screw bolts.Hope this helps
Posted on May 21, 2009
I have one of these cars that had that problem. I fixed mine with a new fan control module. The fan wires can be hooked up backwards to the module when you replace it too. I have a service manual on this car and can answer most questions as I have helped a lot of people with this year model. I will look at which fan should be pluged into where later. You should never straight wire a cooling fan as this will result in other problems because the engine will not come up to normal temperature resulting in poor fuel mileage. This could result in a exhaust converter and o2 sensor failure due to a rich fuel mixture. Reply and I will get back to you asap.
Posted on Jul 01, 2009
It's probably a bad connection to cooling fans, bad cooling fan, or relay in that circuit. Another spot to check is to clean backside of fuse block under hood, as they have been known to corrode up & cause similar problems.
Posted on Sep 17, 2009
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