I've replaced all the water hoses, water pump, thermostat but car continues to overheat. A friend looked at the car and told me the cooling fans didn't come on. I need a wiring diagram to trace the problem to see if it's the PCM, temp sensor, a switch, I don't know? Please leave a link. Thamks
As you can see, a couple of fan relays. Use a jumper wire on load side of fan relay, the load side is the line with arrowhead. The red wire going to load side of relay, top wire in diagram is hot all the time. As far as the control side of relay, the voltage is fuse protected and goes hot with key on. I couldn't get everything in diagram, the coolant temp sensor is involved. Any applicable trouble codes?
Try Alldatadiy.com
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: 1999 cadillac deville overheats
every thing that is electric needs a power and a ground if running a new wire to the fans i would prefer you to use a inline fuse this will keep the wire from catching on fire. u could run the power wire to a fuse that is ignition switch 1,2,3 one of these will work so when u turn the key they kick on. also the ground could be a bolt on the bottom of vehicle. use a test light and see if that wire hanging down is a power wire. hope this helps
SOURCE: I have a 96 Cadillac Deville. The car overheats
i would get a radiator tester to make sure there is no air leaking out at a slow rate
SOURCE: cannot find overheating problem 1997 cadillac
These engines are know for leaking head gaskets. A good quick test for this is fill the coolant tank to the top with the cap off. Start the engine. If the the coolant blows out of the tank, you have a head gasket leak.
SOURCE: 99 cadillac deville engine overheating an loosing
Check to see if you have flow through the entire radiator.If part of the radiator core is cool to the touch when the engine is at operating temp, this indicates restricted radiator flow. If the entire radiator core is not allowing water to flow through, cooling will not be at all efficient. Also a good idea would be to purchase a block tester. available at napa and other reputable parts houses for around thirty dollars. You remove a small amount of coolant, and put the tool in the radiator, or pressure tank opening. If there are any combustable gasses present, i'e' exhaust, this would indicate a head gasket breech, (or maybe worse) and would indicate that it's time to stop looking for a simple problems, and get proffessional help. Good luck to you!
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