Question about 2002 Chevrolet Cavalier Coupe

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No juice to heater fan or switch the relay is good what could it be

I have tested the relay it is good

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Blower fuse is 30amp. underhood fuse box and heater control is 10amp.under dash fuse box.disconnect the blower and connect test light to two wire to blower connector and recheck. check separate purple wire for power and orange for ground by turning different speed on the switch.If no ground replace the resistor (4 wire connector) next to the motor on heater box.

Posted on Mar 27, 2014



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SOURCE: Cooling fan wont work

The water temp sensor is located near the thermostat housing. This sensor is what tells the ECM to turn the fan on/off. The water temp sending unit is located near the same area. You know you have the correct sensor is because the water temp sensor has a 2 prong plug. The water temp sending unit only has 1 prong.

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SOURCE: where is the coolant fan switch for 2002 cavalier

it should be on the bottom of the radiator or by the thermostat housing,

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SOURCE: My 1987 Chevrolet Z24 Cavalier cooling fan will

since you have already tested fan and relay and both work, the problem may be the engine temp sensor. There are two sensors. One goes to instument cluster. This is engine coolant temp sensor, the other is engine temp sensor which is usually attached to engine block, sometimes they are connected to thermostat housing with the coolant sensor. You can pully the engine temp sensor and test that sensor same way as relay. (with mulitimeter)

Posted on Jun 03, 2009

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2 Answers

How do I fix heater fan to operate at low and medium speeds. It only works on High.

depending on car some have a fan relay or its your switch itself

Jan 13, 2016 | Cars & Trucks

1 Answer

Installed new blower motor. bearing shelled in old one. new motor won't blow. tested . it's good don't have power to moter. fuses good relay good. isthere a circuit breaker in wiring for b

I don't have a diagram for a 2008. On 2005 models the blower motor relay gets power from a 30amp fuse.
When the blower switch is in the high position the resistor is bypassed and power flows directly to the motor. The motor is grounded to the car.
The fan relay also gets power from a 7.5amp fuse and is controlled by the HVAC control on the dash.
Do you have power into and out of the relay?

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My 2003 Ford Ranger has no juice going to the heater blower fan. Checked fuses there fine. Hooked power to fan it runs good. Just stopped all of a sudden.

There is a relay/breaker that your fan switch operates. It needs replaced. It can be found under the hood, in a plastic cover with all the other relays. murf427

Aug 01, 2012 | Cars & Trucks

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Heater blower stop working

First thing would be to check the fuse.
If the fuse is good, test the power to the fan with a voltmeter. If there is no power to the fan, then the switch or relay is at fault. You can test the relay itself with an ohmmeter.
If there is power to the blower and fan doesn't work, than likely the blower motor is bad

Nov 10, 2010 | 2002 Nissan Altima

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If there is no positve voltage line to the fan switch and if your fuse is testing good , then it is possible that there is a break in the wiring harness.
You must confirm once again if the heater control switch is having the input , if so the switch is faulty and needs a replacement.
If not you can loop a new line tto the heater swittch input.

Sep 11, 2010 | 2004 Jaguar XJR-Series

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Heater/AC fan not working, resiter has been changed and switch has power

This is a common problem with this vehicle. You will need to make some tester cables with some 18 g wire or buy some they should be about 20 in or so. Expose the wire on the ends by about an in and attach some alligator clips to help that stay put and and unplug the connector that pluigs into the fan housing from under the hood. (it is nearest to the computer metal box and just above the battery. It unplugs and had two prongs almost like a house plug in. Connnect one wire you made to the neg of battery. Afix this to one post of the prong you just exposed. Do the same to the other side and you should hear the motor whirl. If it did not, reverse your wire connections and test again. If your fan does not whirl, your fan is shot. Replace with a new fan preferably one that has some kind of warranty or from a salvage yard. The reason I say this is that you can get these fans online for about 40 bucks but they wear out very quickly and draw more electric current as they wear out and burn out your resistors,relay and your selector swtich. Another thing to check and replace is that little black relay on your passenger side under your glove box area. Check your fuse too. When you put a good fuse back in, you should hear your relay click as you plug it in and pull it out. Replace this relay as this is known to cause grief too. You can remove your console panel (plastic shroud that covers your radio and heater and then remove the heater/ac module and take a look at the selector switch that makes your fan blow light or harder. This is known to burn out as well. You do not need to replace the whole module as the blower fan speed selector switch pops out. Check your wiring to see if it is melted. Most of the time, your fan gets worn draws more juice and gets things hot and it can backfeed current into components and fry them. Blower switches are cheaper at Autozone so stay away from the stealership parts unless you have too. Replace that black relay while you are in there as this can partially work and cause issues as well. Good luck and let me know if you need any other info or if I helped at all.

Apr 08, 2010 | 1999 Jeep Wrangler

2 Answers

I have no heat in my 96 Dodge Caravan. I have tried testing the blower fan and it works, I have checked the fuse it is fine, I have replaced the resister, and I still have no juice going to the inside fuse...

should be a blower motor relay inside fusebox under hood....try swapping it with another of the same kind from same fusebox to see if that is the problem...there is usually a diagram to tell you which relay is for what and they are just plug ins....good luck....lee

Feb 19, 2010 | 1996 Dodge Caravan

1 Answer

Location of heater blower relay on '92 Accord

If the fuse is good,check to see if there is voltage to the blower motor,if there is,replace the blower motor.Sometimes,not always,if you bump the blower motor,it will start working,if this happens,then the blower motor is bad,if it does not,the fan switch could be bad,but the relay is usally near the blower motor.Testing it with a test light is the best way to test it,ground one end of the test light,the other end has a point on it.Use the piont of the test light to touch all the legs on the relay,with the key on,and the fan on high.The test light will light up,on almost all the legs,but it will also activate the relay when you touch the right leg of the relay,the relay needs to stay plugged up as you do this.If you can not access the legs of the relay,because of a skirt on the relay,push the point of the relay into the wire that you are testing,or into the plug,near the leg of the relay.The legs I am refuring to,are the prongs on the relay.If the relay clicks and turns the fan on,when you touch the right one,then the fan,and the relay are good,it will be the blower fan switch.Now if you already have high,blower fan,and the lower speeds are the problem,replace the blower resister,It is mounted right next to the blower motor,and has about 7 wires plugged into it.

Jan 09, 2010 | 1992 Honda Accord

1 Answer

No Electrical Power to Heater Blower

First thing to check would be the fan speed resister, fan(blower-motor)relays, and possibly a bad ground. Start at switch on the dash and go to the relays and resister next.

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Heater Fan/Blower does not work.

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