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Fuse that operates engine fan - Cars & Trucks

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  • Cars & Trucks Master
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Usually a relay or thermostat and a fuse. Check main fuse block for any blown fuse. Try jumper wire to fan to insure motor is good.

Posted on Apr 27, 2015

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Posted on Jan 02, 2017

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How to replace coolig fan sending unit on a 2008 chevy uplander


Why ? Did you test ? Hook up a scan tool to see if the PCM/ECM - engine computer is reading coolant temp. ? Testing not guessing ? Do you even know how the system works .

The engine cooling fan system consists of 2 electrical cooling fans and 3 fan relays. The relays are arranged in a series/parallel configuration that allows the engine control module (ECM) to operate both fans together at low or high speeds. The cooling fans and fan relays receive battery positive voltage from the underhood fuse block.
During low speed operation, the ECM supplies the ground path for the low speed fan relay, which is Fan 1 Relay, through the low speed cooling fan relay control circuit. This energizes the low speed fan relay coil, closes the relay contacts, and supplies battery positive voltage from Fan 1 Fuse 29 through the cooling fan motor supply voltage circuit to the left cooling fan. The ground path for the left cooling fan is through the Series/Parallel relay, which is the Fan 2 Relay, and the right cooling fan. The result is a series circuit with both fans running at low speed.
During high speed operation the ECM supplies the ground path for the low speed fan relay through the low speed cooling fan relay control circuit. The ECM supplies a ground path for the high speed fan relay, which is the Fan 3 Relay, and the Series/Parallel through the high speed cooling fan relay control circuit. This energizes the Series/Parallel relay coil, closes the relay contacts, and provides a ground path for the left cooling fan. At the same time the Fan 3 Relay coil is energized, the relay contacts close to provide battery positive voltage from Fan 2 Fuse 33 on the cooling fan motor supply voltage circuit to the right cooling fan. During high speed fan operation, both engine cooling fans have their own ground path. The result is a parallel circuit with both fans running at high speed.
When the request for fan activation is withdrawn, the fan may not turn OFF until the ignition switch is moved to the OFF position or the vehicle speed exceeds approximately 10 mph. This is to prevent a fan from cycling ON and OFF excessively at idle.

Feb 27, 2017 | 2008 Chevrolet Uplander

2 Answers

Where is the fuse for motor fan in uplander 2006?


there is 2 fuses that you have to check
one will be in the big fuse assembly in the engine bay, the other probably in the fuse assembly in the cab
If they prove ok then it is possible that the coolant temperature SENSOR is faulty and needs replacing
don't confuse it with the temperature sender which operates the temp gauge.

Aug 10, 2015 | 2006 Chevrolet Uplander

2 Answers

Check engine light is on,it is showing the engine code po480.what is this?


The computer is unable to turn on the radiator fan. Check the fuse and relay in the engine compartment relay box. If the fuse is good, try swapping the relay with the one next to it. If the relay is bad, the truck will not start, as the ASD relay is necessary for the operation of the engine. If the fuse and relay are good, check to see it the fan will run when connected directly to the battery. If not, replace the fan motor. Please let me know if you have any questions, and thanks for using FixYa.

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Apr 07, 2011 | 2004 Dodge Dakota

1 Answer

Radiator fan not operating could be fuse don't know how to change 1994 lancer


Look in your manual for fuse diagram LOOK FOR A RELAY, put a "RF" on top of the "Radiator Fan relay and find another with same part number. in the fuse compartment. ie Air Cond. put an "A C" on that one, switch them out and get engine HOT to see if fan works, turn AC on too if it works the relays are both good. next things to check [a] "Temperature switch" on block, or [b] corroded wire terminal at firewall connections [c] the fan motor could be bad ...... that Radiator fan operate TWO ways. (1) a hot engine (2) turn the AC on high will also turn it on. Check this first before U get your hands greasy.

Mar 20, 2011 | Mitsubishi Lancer Cars & Trucks

1 Answer

I have a Prelude '97. It overheats. I replaced the readiator, water pump, and one of the fans, but it still overheats when going uphill or when in slow traffic. I've noticed that the fan that is...


will try to help. the fan you replaced, was it the air conditioner fan? if so. then you need to check your primary fan. the one that does come on when the engine reaches operating temperature. make sure by starting engine, let the motor run and the temperature guage reaches the normal operating temperature.if the main engine cooling fan does'nt come on, then you'll need to check the fuse box under the hood. relays are black square plug in's they are marked and will[fan relays] tick when you turn the key on] if main engine fan does not come on when engine overheats, #1 fuse blown #2 relay bad #3 main cooling engine fan bad. note; the air conditioning fan will come on with engine running,when air conditioniing is turned on. when the a/c is turned off, the a/c fan will not be turning. hope this helps and as always, thank you for choosing fixya.com

Nov 28, 2010 | 1997 Honda Prelude

1 Answer

Heater fan don't work,don't know which fuse operates heater fan


Hi!!
Look in engine compartment close to battery for fuse box, remove cover and inside cover there is a diagram of fuse/relay locations.
You are looking for a fuse and relay, it should say blower fan or AC blower fan. First check fuse, if Fuse is ok. check Relay.
Good Luck!! Don't forget to rate this post!!

Aug 14, 2010 | 1999 Ford Escort

1 Answer

The heater fan is not operating and I thought it might be a blown fuse. I checked the fuse box under the dash and couldn't locate the fuse for the fan by the descriptions given. Do you know which fuse on...


My 2002 I35 has the blower fuse under the hood in the fuse box in the engine compartment. The fuse box cover has the "key" or description of which fuse is which. If the blower fuse is bad and you replace it, only to have the fuse burn again then I would check the blower resistors that are located behind the glove box. Very common for one of these resistors to go bad causing only low speed operation of fan. Burns the fuse when you try to operate the fan on the higher speeds. Good Luck

Nov 17, 2009 | 2004 Infiniti I35

1 Answer

Car overheat


The rad fan is required to keep your engine at a normal operating temp. When you are going at hiway speeds the fan is not needed. When you stop then the fan has to operate to keep the engine cool.If the fan is not operating, it could be the fuse or fan relay or temp sensor or computer This problem should be checked by someone who is a professional..

May 09, 2009 | Honda Civic Cars & Trucks

1 Answer

Overheating


check with a 12 volt test light under dash fuse 10A and possibly a high amp fuse 30 or 40 amp under the hood. The PCM also controls coolant fan operation. Hope this helps

May 03, 2009 | 1999 Pontiac Firebird

1 Answer

Auliliary fans now operating. Not getting power to them.


Which fuse are you looking for? There are six fuse panels for an E39 BMW
Fuses F1 - F45, fuse panel 1, glove compartment. Twist white plastic retainers 90 degrees and pull down from top of glove compartment.
Fuse 22 (30 amp) is aux fan high speed relay(K22)
Fuse 7 (20 amp) is engine cooling fan normal speed relay(K21)

Jan 22, 2009 | 2001 BMW 5 Series

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