Question about 1998 Buick Century

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Cooling fan will not turn on less you turn on ac when both fans work replaced heat sensor works the same

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Change the fan relay switch.

Posted on Aug 01, 2009

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2 Answers

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

1 Answer

Cooling fan not working


At this point, we need to verify if the fan even works. Try turning on the AC and see if the fan turns on.

Apr 01, 2016 | Cars & Trucks

2 Answers

Engine cooling fan only works when ac or defrost is on


if engine at long stand still,the engine temperature will rise about 190 degrees the cooling fan suppose to automaticaly turn on when coolant temperature sensor get hot it cause its resistance decrease causing pcm to send power to coolant fan relays and cooling fans, when you turn on AC the cooling fans suppose to turn on to cool down AC CONDENSOR, IF NOT AC WONT WORK COOLING FAN COOLS DOWN REFRIGERANT SO IT CAN RECYCLE THROUGH THE SYSTEM AGAIN.your cooling is suppose to turn on when engine at a sit still if vechicle not moving as coolant temperature rises at a set point the cooling fans will turn on cool down engine.cooling fans dont turn on when you first cold stsrt vechicle unless you have AC SWITCH ON.if cooling fans dont turn on when vechicle at a long stand still or moving along slow traffic.if coolant temperature sensor been replaced and fuses and relays okay have dealership check see if pcm driver circuit working faulty pcm will cause cooling fans not to turn on.

Sep 27, 2012 | 1996 Buick Century

1 Answer

Radiator fans not working car is running hot.


Turn vehicle off. Allow to cool. Raise hood.
Try to see if the fans spin freely by hand. If not, replace. If they do spin, proceed to next step.
Next step-
Check coolant level, add if needed. Remember-radiator must be cool before opening cap. Make sure radiator cap is secure and tight if coolant was added.
Start vehicle. Observe coolant gauge as vehicle warms. Fans should come on when temp gauge reads halfway between c and h.
If fans do not come on see if they come on when you turn on ac or heat. If doing this makes them come on, suspect faulty cooling fan sensor switch. If they don't come on replace cooling fan sensor switch and fan relay.

Aug 30, 2011 | 1989 Nissan Maxima

1 Answer

Drivin to work car over heats n get a hole in radiator replaced that n the thermostate N car still seem to over heat


try turning key on with out starting see if electric cooling fan comes on if not start engine turn on ac if it doesn't come on that's most likely the problem (fan,wire or sensor to the fan )

Aug 13, 2010 | 2002 Nissan Sentra

1 Answer

Coolant system


The car overheats because the fan system is not working. The engine coolant sensor tells the computer to turn on the fan when it gets hot and also sends temperature readings through the computer to the heat gauge. Try turning the AC on if you have it--it should immediately start the cooling fan. If nothing, check the fan fuse and relay. It's also possible that the fan motor is frozen due to bad bearings. Try replacing the coolant temperature sensor to see if that restores the gauge readings. Hope some of this helps!

Jul 02, 2010 | 2000 Saturn SL

2 Answers

2000 jeep grand charokee laredo over-heating


have you changed the thermostat? is your fan kicking on? if your fan is not kicking on you need a temperature sensor.

Aug 17, 2009 | 2000 Jeep Grand Cherokee

1 Answer

Kia over heats when air is on only


your AC cooling fan is not working properly, most vehicle has two fans, one for the radiator and another for AC, both work in sync with one another; if one cooling fan only working it does not produce enough cooling for both radiator and condenser at the same time; by running ac you producing more heat and its cant cool the engine fast enough with one fan so your engine is overheating when running AC. The temperature sensor could be faulty and need to be replace or your fan motor can also be faulty. Check the fuse first and the relay make sure they are not burn out. sensor cost about 30 bucks get it new, relay 35-40 new used 5 bucks at junk yard, fan get it from a junk yard for 25-30 bucks, new will run over 100 bucks. don't run the air and overheat your motor, it can damage your engine or may blow your radiator. if you do run ac watch the temp very closely, don't let temperature get into the red.

Jul 10, 2009 | 2002 Kia Sportage

1 Answer

98 Saturn SL AC/cooling fan will NOT work


Do not let this car over heat a blown head gasket will ensue. Locate and replace the fan relay, if that doesn't fix the problem unplug fan and use jumper wires to ground the plug then feed power to the positive side of plug to check fan, if that doesn't work replace the coolant temperature sensor located somewhere near the intake manifold or thermostat housing area.

Jul 01, 2009 | 1998 Saturn SL

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