I just bought the car and I believe the radiator cooling fans are not kicking in and the engine overheats when it idles and I'm at a red light. I checked the fuse for the fans and seems to be ok. The wiring to the fans don't seem to be factory wiring. I found a wire that is not connected to anything but I'm not sure if it links into the fan's wiring.
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Re: 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
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Could be. Has the thermostat been replaced ? You could run the engine without the radiator cap to see if the system has air pockets. A restriction in the exhaust could cause the engine to run hotter on the road than on short trips.
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!
The most common overheating problem with the Northstar engine is a blocked purge line(small hose).The purge line is designed to purge air out of the cooling system. There is a small diameter hose coming from near the top of the coolant tank (not the cap) ,this is the purge line. With the engine idling,pull the purge line from the tank,if there is no coolant flow from this small hose,it is blocked and this will cause overheating. If the hose is clear, check for blockage at the nipple on the tank.Or trace the hose back until you find the blockage. The hose goes in to the engine to a crossover and comes out the other side close to the thermostat housing,the blockage may be there.
Also note that the cooling fans don't come on until the coolant temperature hits around 225 degrees. During normal highway driving the fans will very rarely come on(if at all) due to constant air flow through the radiator.They will only usually come on in heavy traffic conditions on a hot day. But......if you have the Air Con switched on, the fans will run all of the time.
you need to make sure the fans are turning on to cool the engine down first,the fans won't kick on until the coolant reaches 212 degrees ,make sure your not losing coolant ant radiator is full,check it when the engine is cold,the north star engines have a flaw in the head gaskets leaking,
The cooling fans will not come on until 225 degrees. Normal temp is around 199-215. Sitting still in traffic most will inch up around 220 or so. When you turn ac on it turns the fans on and may cool down engine, Check fan operation.
maybe the water pump wasnt the problem to begin with. if the engine temperature only goes up when you stop the car then most likely it is the FANS that are not engaging to cool the radiator which is a problem with the fan sensor, computer that controls the fans, relay/fuse. I had the same problem on my 1999 cady STS coming back from my vacation. the engine temperature would be normal only when I drove the car above 70km/hr because the air passing through the front of the car would cool the radiator. when I slowed down the fans wouldnt start and no air was passing through to cool the rad, hence the engine temperature would start to go to HOT. good luck.
THIS SOUNDS CRAZY BUT, ON SOME OF THE OLD SCHOOL CARS, THEY HAVE A CLUCH FAN.. AND IF ITS BAD, THE CAR WILL OVERHEAT WHEN DRIVING AND COOL DOWN AT IDLE.. I DONT THINK THE CADY HAS A CLUTCH FAN, BUT I BET ITS IN THE FAN.. GOOD LUCK KEITH..
You can rent a cooling system preasure tester at a parts store. These engines run so close to boiling that they must be able to hold presure or they overheat. Presurize the system and check for even the smallest leaks at all hose connections. I fought this problem for a long time before I figured it out.