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Where is the relay for the blower fan in a 1979 F-150 located?

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2wd or 4wd, which motor, with or w/o a/c

Posted on Feb 07, 2010

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2006 tacoma heat/air blower fuse location


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Heater on my envoy only works on 3-4 setting, could that be the switch.


Thanks for the opportunity to let me help. The blower control switch in your vehicle also uses a blower relay. This relay is generally located on the firewall on the passenger side near the heater fan. You can also look in you vehicle owners manual for the location of the blower relay, it may be also be located in the fuse and relay box under the hood. Generally speaking if the highest setting doesn't work on a GM vehicle it is a high blower Relay. This item is not expensive and can be purchased at most all you local Auto parts stores. If you have a Napa, Orielly's, or AutoZone these stores will also likely help you in the location if you are unable to locate this relay. Here is a general picturepepsiman1967.jpg The installation of this relay is either to remove from the fuse box, or if located near the heater fan housing then you will need to remove the mounting screws, remove the wiring clip, then reverse to install. I hope that this has helped you. D.R. Wilkins

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What your looking for is a blower motor resister set next to blower motor, screw into the housing.

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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.

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1 Answer

1992 Cadillac Coupe Deville blower fan runs all the time


The BLOWER MODULE is located on the A/C EVAPORATOR housing located UNDER THE HOOD passenger side firewall. Has 2 electrical connectors. Mounted with 4 screw bolts.Hope this helps

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2 Answers

Blowere fan does not work all the time.


It wouldn't be a fuse that would cause this. If the fuse was blown it would never work. It could be a relay that is bad and warming up or it could be a loose wire.

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Does ac blower have a fan relay ? It doent blow ******* max


if it doesnt work on all speed its the blower motor resistor that broken thanks pierre

Jul 30, 2008 | 1979 Pontiac Firebird

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