Question about 1999 Cadillac Eldorado

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My coolant fan does not go on.

1999 cadillac eldorado

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Check the fuse, if good then check the thermoswitch in the radiator (it's about an inch and a half in diameter located on the lower part of the radiator with two wires ) by disconnecting the wires and touching them together (again, with engine hot...at least 190 degrees) if the fan comes on, you have a bad switch. If not connect a 10 gauge jumper wire from the battery to the fan itself... With power direct from the battery (and a ground wire, if necessary) fan should run... if not replace the fan assembly... if it does run then you have a bad cooling fan relay... Hope this helps...:-)

Posted on Apr 16, 2009

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Posted on Jan 02, 2017

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1999 Cadillac eldorado overheating. Changed thermostat, still overheating now with white smoke coming from exhaust. Checked water pump belt, it is there and turning. Cold air blowing from heater, no heat.


coolant leaking into engine probably blown head gaskets. More damage will occur the more you drive it. Unfortunate and expensive repair on a northstar.

Aug 24, 2011 | 1999 Cadillac Eldorado

1 Answer

I have a 99 cadillac eldorado it is overheating i changed thermostat and coolant it still overheats i beleive the water pump works the fans work when put coolant in the over flow it shoots out when it gets...


Hello: Open hood, stand in front of car look on left side (driver side) of engine toward the radiator, there will be a black metal guard, under the guard there will be a small belt. This is the belt that drives the water pump. Make sure the belt is there. If belt is there start car and with engine running check to be sure belt is turning and that the water pump is turning. If all that is okay then you may have blown head gaskets. To check head gaskets you need a sniffer tool to smell the engine coolant which will tell you if you have exhaust gas in the coolant.

Jan 21, 2011 | 1999 Cadillac Eldorado

1 Answer

I just purchased a 1999 Cadillac Eldorado, ETC with a 4.6L V-8 Northstar engine. My engine keeps blowing out the engine coolant through the over-flow hose when I stop at a light or if I let the car idle...


It may be overfilled. Do you keep adding coolant when it blows it out? The reservoir has a line to which the coolant should be filled. If overfilled it will blow out when hot. Other reasons may be that the fan that cools the radiator may not be cycling on and off to keep it cool. Also check the small belt on the right front side of the engine that is under a plastic cover that runs the water pump. It sometimes breaks and the water pump stops turning.

Sep 21, 2010 | 1999 Cadillac Eldorado

1 Answer

My 1999 eldorado overheats, nothing is leaking, coolant has not been changed until now, could sludge be cloging thermastat, should i change it? I changed radiator cap, Could air pockets cause overheating?


If you aren't loosing any antifreeze, you might check to see if the coolant fan on the radiator is coming on. If the thermastat is sticking your radiator hose will be solid to even swellen sometimes. Of course not to mention that if a radiator is over 5 years old, it could be bad, so you may need some things checked futher.

Oct 19, 2009 | 1999 Cadillac Eldorado

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its next to the thermostat housing on the front of the intake manafold

Mar 16, 2009 | 1999 Cadillac Eldorado

1 Answer

92 eldorado coolant fans dont come on


the fans have relays that are located in the fuse box under the hood on the driver side. a quick check involves just switching the a/c clutch relay with the fan relay if they turn on when engine is hot the relay is bad. if not that means there is a bad connection or the temp probe is bad. make sure no loose or frayed wires are present. hope this helps. please rate this solution. thank you.

Aug 29, 2008 | 1999 Cadillac Eldorado

1 Answer

Can i reset my ac code? 1999 cadillac eldorado


Hi, follow this step for clear the a/c codes on your cadillac el dorado 1999.
I Hope you will solve your problem with this instruction page, thanks for using fixya.1736984.jpg

Jul 07, 2008 | 1999 Cadillac Eldorado

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