Question about 2000 Pontiac Grand Prix

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My cooling fans dont work.Ive replased the relay, temp/ems sencer andit still dont work. but when the a/cis on they work plz help

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  • 414 Answers

First test the fans themselves. Then if the fans do work, trace your wiring back to find where power is lost.
Are there any service codes?

Posted on Jun 20, 2009

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Posted on Jan 02, 2017

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Cooling fan relay's High speed relay K-46 Engine cooling fan relay K-45 .Located in the under hood fuse box. The PCM - engine computer energizes the relay's when the input from coolant sensor shows it's over temp . Check out videos on youtube . Cooling Fan Repair On Your Car Check out a few other videos

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Did you check the cooling fan relay's ? Your vehicle has three of them . Free wiring diagrams at http://www.bbbind.com/free_tsb.html Enter vehicle info. year , make , model an engine size . Under system click on engine , then under subsystem click on cooling fans . Then click the search button then the blue link . Learning how the fans work then testing the electrical circuits is how we as Technician solve problems like this . We don't ask if anyone has this issue an knows how to solve it . Someone else's fix maybe different from what it will take to fix yours .
The cooling fan's are computer controlled ,by the PCM - powertrain control module . When the engine coolant temp. gets hot enough the PCM see's this through the use of a coolant temp. sensor . When it reaches 212 degress the PCM energizes relay # 1 sending B+ voltage through both cooling fans to ground causing low speed .
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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.

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I have a 92 honda accord that overheats because my fans dont turn on. i know they work because when i turn the a/c on they turn on, but other wise they dont. ive replaced the thermostat and have had no...


Check for a faulty engine coolant temperature switch. This is the switch that talks to the cars computer and the fan relays. (It is NOT the same as the separate coolant temperature sender which is what sends the temperature to the coolant temp gauge on the dash instruments.) If the engine coolant temp switch is stuck open or in the cool mode, it may not trigger the fan relays. Meanwhile, your coolant temp on the dash gauge will look normal.

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Does a 95 cutlass supreme have a fuse for the cooling fans or only the relays. I dont see a fuse for the cooling fans. Neither fan is coming on, Ive jumped the fans they both work, Ive changed out the...


There are three fuses and two relays for your coolant fan. They should all be in your underhood fuse box. They may not be marked "coolant fan", so check them all, (2) 60 amp , (1) 20 amp, (1) 15 amp. If all the fuses are good, you may have a bad fan switch (temp sensor). It tells the fan when to turn on, follow the wire from the fan motor to find it.

Dec 19, 2009 | 1995 Oldsmobile Cutlass Supreme

1 Answer

Does a 95 cutlass supreme have a fuse for the cooling fans or only the relays. I dont see a fuse for the cooling fans. Neither fan is coming on, Ive jumped the fans they both work, Ive changed out the...


Yes, in the underhood electrical center, a 60 amp with a red wire going to relay 1 and a 20 amp with an orange wire going to relay 1 and a 15 amp with a brown wire going to relay 2 and another 60 amp with a red wire going to relay 2. The diagram doesn't show a temp sensor, but it does show dark blue and dark green wires going to the power train control module, so it must get the temp input from there. The second fan usually comes on when the A/C is turned on and it apparently gets that signal from there also. Hope this helps.

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