Question about 1997 Cadillac DeVille

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New water pump and thermo eng runing hotter than norm, fans only come on with ac

Engine overheating at 225 when you turn ac on both fans come on temp does go down.i beleive at least one fan should be on if temp is at certain degree,this does not happen any help would be greatly appreciated

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You might have an air lock in the cooling system have it blead out properly

Posted on May 30, 2009

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Would a closed thermostat stop the radiator fan from turning on when the temperature is within heat range.it turns on when I turn ac on,is that a different cause when not using ac.


There are two different thermostats--one in the cooling system, and one just to turn on fans. The AC has a separate circuit to turn on fans regardless of engine temp, so tind the the fan thermostat and test it.

Jul 03, 2016 | AC Cars & Trucks

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Ford explorer 2007 v8 4.6 L Overheating in summer


chek if the electric fan is turning on when the ac is turned on

Jul 27, 2015 | 2007 Ford Explorer Eddie Bauer

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Car keeps overheating


Assuming the engine is ok, no leaking head gasket or exhaust problem, you need to know if the radiator fan comes on when the engine reaches 225 degrees. It should also come on when you turn the ac on if the ac works.
Its also possible you have air in the cooling system.

Jul 20, 2012 | 2005 Dodge Neon

1 Answer

Van keeps overheating. I replaced the water pump, Thermo, and had the raid redone. And the fans seems to come on when im driving. What would be the problem???


when the vehilce is hot, what is the tmeperature of the top and bottom hoses,...with the engine hot, turn engine off, and feel the hoses.....are they the same temp, or is one hotter/colder than the other
????

Oct 06, 2010 | 2001 Dodge Caravan

1 Answer

I have a 95 Gran AM GT with 3.1 auto. The motor will run until it gets overheated and boils over, but the fan will not start.I have totally flushed the system,pulled and inspected the water pump, changed...


Fan operates when coolant temp reaches 226 deg.F and shuts off at 219eg.F
fan is controlled by the PCM infuts from Eng. coolent temp. sensor & Intake air temp. sensor
the yellow wire is the 5V reference and the black wire the is the PCM ground sensor
make sure your not using teflon tape on the threads of the temp sensor.
it sounds like the PCM wont turn it on. check the harness for continuity between temp. sensor and PCM harness
clear connecter - pin 17 black, pin 31 yellow

Sep 12, 2010 | Pontiac Grand Am Cars & Trucks

1 Answer

My 2001 VW JETTA GLS IS OVERHEATING


If one pipe from the radiator is hotter than the other one its usually the thermostat or water pump, seen as you already changed the thermostat id say its the waterpump.if you start the car when temp. is syill low enough to take the radiator cap off and leave it idleing and you see bubbles from the water at the cap then you possibly have a blowen head gasket etc

Sep 01, 2009 | 1996 Volkswagen Jetta

2 Answers

My 2005 grand prix fans wernt working the other day so my engine almost overheated...my boyfriend fixed it so now my fans work but im still not sure where my tempature gage should be.


At around 200^ or little less195^ while driving, ac on idling in traffic will read hotter but out of red, note should change thermo stat if over heated I hope I was Helpfull

Aug 27, 2009 | 2005 Pontiac Grand Prix

1 Answer

Coolant and engine temp both running much hotter than normal. almost overheating but not quite. hotter they get the less cold my A/C becomes


Mine was doin the same thing when i got it. We fixed the " fan clutch " which apparently sits in front of the radiator and helps cool the AC(according to mechanic). When this got fixed the AC ran cooler and car started running cooler. Like yours, mine was overheating, but running hotter than it should.

Jul 26, 2009 | 1998 Audi A4

1 Answer

CEL is ON. OBD code P2181. I already replaced the ECT 3 mo ago due to OBD code P0118.


P2181 is a overheating engine.  
Can be:
Bad fan themoswitch, temp sensor themostat water pump impeller fan motor or fuse on battery
check to see if fans work by turning on Air Conditioner (fans should run with A/C on). Turn A/C off, warm engine, check to see if fans come on, if they do NOT it may be thermo switch on radiator on lower left side, has 3 wire plug, takes 1-1/8" wrench/socket to remove.  This thermo switch controls fans when temp reaches 195F, if fans do not come on at engine temp 190-195F try  replace switch VW part number: 1J0-959--481-A  You can verify if the switch is bad by shorting wire 1 and 2 (fans should come on when jumpered).

Oct 15, 2008 | 2002 Volkswagen Jetta TDI

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