Question about 1999 Cadillac DeVille

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Overheating fans come on when temp reaches 222, go off at 212. thermostat good catylitic converter good.

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Could be a warped head...

Posted on Sep 02, 2008

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2 Answers

If thermostat is stuck open will it make your engine cooling fan run constantly?


im assuming your speaking of the engines internal thermostat ? if this sticks open (not likely) then temp gauge on car will never reach operation temp and stay low on scale ( entire purpose of thermostat in first place) now if your coolant fan switch sticks closed (very likely) then your fan will run constantly and only shut off with the key


also another condition that makes them run more often is that engine temp gauge is over normal (showing) and this is an indicator that cooling system has a problem and needs service

Sep 29, 2016 | 1993 Geo Prizm

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Overheating


That is normal cooling fan operation. the fans are computer controlled and not turned on until the engine reaches the pre programmed temperature, that is about 185-195F

Jan 03, 2014 | 1998 Chevrolet Lumina

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2007 Lincoln MKX Overheating Fans not coming on although jumped both fans directly to battery and they are good WHAT NEXT Please Help Frustrated and pissed Thanks DL


usually at idle they wont kick on until car reaches certain temp under stress. change thermostat since its fairly cheap and is a simple fix. number one cause of overheating. but number one effected is head gaskets and that will cost you.

Jul 14, 2013 | Cars & Trucks

1 Answer

Jeep keeps overheating replaced relay


A mechanic would use a scanner to check the engine temp sensor.
The temp sensor tells the computer what the engine temp is and the computer activates the fan relay when the temp reaches about 230 degrees.
Since you said relay I am assuming your Jeep has an electric radiator fan.

Jul 19, 2012 | Cars & Trucks

1 Answer

The car is overheating and i noticed the fan stays on


First make sure there is a good 50/50 mix of antifreeze and water and that it is filled properly. Second, it sounds as if the thermostat may be stuck. If it's overheating, the temp sending unit controlling the fan is going to tell it to stay on. Change the thermostat and fill it with fresh 50/50 mix of water/antifreeze. Run the engine to normal operating temperature with the heater running and the radiator cap off. Ensure there is good circulation once it reaches normal operating temp. If there appears to be no circulation you could possibly have a bad water pump as well. This should take care of your problem.

Sep 28, 2010 | 1998 Ford Contour

2 Answers

What is the use of thermostat? is it true that by removing the thermostat, it will help in reducing overheating?


a thermostat maintains the engine to a pre determined temp which is most efficient for operating.by removing stat you will never reach/maintain the correct temp,so use more fuel,and cause more engine wear.to reduce the risk of overheating,keep the car maintained correctly,and if towing/climbing high terrain,fit a secondary electric fan in front of the radiator.fitted with a on off switch for when not needed.......(normal useage).

Jul 14, 2010 | Ford Mustang Cars & Trucks

2 Answers

Coolant light on


You say it's overheating, more info needed such as:
Is the engine temp gauge showing that it's overheating?
Is it actually 'boiling over' and losing coolant?
If it's running hot, but not losing coolant, check to see it the cooling fan is operating when the engine temp rises. You may have a bad cooling fan switch that is not signaling the fan to go on to lower the engine temp.
It could be a stuck (closed) thermostat that is preventing proper circulation of coolant after the car reaches operating temp.

Jul 28, 2009 | 2003 Ford Escape

1 Answer

1994 Saab 900 S convertible running hot


You don't say whether your electric fans both work...

First, check fuses #25 and #6 (both 30 amp)

There is a fan thermoswitch is on the left side of the rad. Turn the ignition on, and after pulling back the boot, short across the two terminals with a screwdriver.

If the fan runs, fan and wiring are both good, but thermoswitch might be faulty.

If fan only runs when thermoswitch is shorted like this, switch needs to be replaced (I strongly recommend that you get the low temp switch to prevent overheating - your temp gauge will not go over the middle position even on the hottest days; also get a low temp thermostat,and ALWAYS get a Saab stat, not an after market one! The SAAB stats are three position, and most after market ones aren't)

if the fan doesn't run when switch is shorted, check for voltage between green wire and ground at the switch.

Voltage indicates faulty fan, if no voltage then check the fan relay J in the main fuse box for the A/C rad fan, and also check relay G - it's for the rad fan.

Hope this helps!

Saabreur

Jun 22, 2009 | 1994 Saab 9 3

2 Answers

BMW overheating


many things could cause the overheating. broken water pump impeller, stuck thermostat, clogged radiator, inoperative cooling fan on the radiator.

i would first check to see if the cooling fan on the radiator is working. when it reaches operating temp (or surpasses it in your case), see if the fan attached to the radiator kicks on. if its not on, then either the fan has failed or the temp relay to kick on the fan has failed. also, make sure the connector is plugged in.

after its at operating temp, turn off the car and feel the radiator. if you feel cool spots, then it is clogged and needs replacing.

wile under the hood and car is off, feel the upper & lower radiator hoses. if one is hot and the other is cool, then either the water pump (actually the impeller on it) has failed and is not circulating coolant through the radiator. a common problem in this model.

but it could also be the thermostat. if failed, it would not allow coolant to flow & circulate.

hopefull one of the above items is the problem. good luck.

Mar 07, 2009 | 1999 BMW 323 Series

1 Answer

Honda 1991 3.2 litre v6 overheating. changed thermostat and water pump


check your catylitic converter and your muffler as both of these will cause your vehicle to overheat if either of them is plugged.

Oct 14, 2008 | 1991 Acura Legend

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