Question about 1999 Chevrolet Cavalier

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Heater Fan The heater fan works only on high; I replaced the motor but have the same problem. Is it a switch; wiring harness; or...?

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It's the relay.

Posted on Jun 26, 2008

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Heater fan stop working


Should have a fuse for it; look for 25 or 30 amp heater fuse. If it's good, pull off the connector at blower motor, and with key on and heater fan switch on high setting, check for power at the connector. If you have power there, then the motor nust be bad and need replacing. If no power at the motor, the switch may be bad, or the wiring or the heater relay needs to be investigated.
Good luck.

Feb 02, 2012 | Cars & Trucks

3 Answers

My AC just recently stopped blowing on the LOW and MEDIUM fan settings but still works on HIGH fan setting. Any ideas?


Sounds like your heater/bower motor has an issue. Behind the glove box door is your heater motor, and mounted to it is a heater motor resistor. It will have a wire harness plugged into it. These go bad, and you will loose low speeds.

Apr 09, 2011 | 2005 Jeep Wrangler

1 Answer

I have a 1999 GMC Suburban and the heater switch only works on high. Originally the heater fan did not work at all and then one cold morning I tried the switch and heard a loud clanking noise from the fan...


I'm 99% sure it is the blower motor resistor - common problem. Pull the panel off the passenger
side under the glove compartment. You'll see the blower assembly on the right side with a multi
colored wiring harness going to it. Disconnect the harness and pull out the reisitor, it'll have a gasket going around it to protect it from moisture and humudity. I have replaced 3 on my 1999, but the last one, I wrapped electrical tape around the exposed resistor. Might be luck, but this one has lasted me over 2 years now. While you have the panel dropped, I highly suggest chainging the air filter located there as well. Your AC will run more efficient.

Jan 24, 2011 | 1999 GMC Suburban

1 Answer

HEATER FAN DOES NOT RUN. HOW CAN I CHANGE THE HEATER FAN OR IS IT THE MOTOR. DOES RUN FOR A WHILE WHEN I HIT THE DASH.


I would venture to say that if you hit the dash and the motor started running then the problem would be in the heater control assembly mounted in the dash, like bad wire to Heater switch connection. A bad connection can jenerate a lot of heat and start melting things unless you find the problem soon enough. The switch may already be damaged inspect switches and wireing for any vissible damage and replace as required. However if everything looks ok with the heater control assembly, Their are a few more things you can check to be sure of before relpacing the heater blower motor. Turn the heater controles to the high heat and fan on high as well, settings and remove the heater blower motor pig tail and check to see if power is getting to the motor,( use a 12 volt test light at the wire harness side of this connection ) also check for power going to and leaving the blower motor resistor assembly ( mounted to the side or top of the blower motor housing ). If so equipped. If you find no power getting to the motor at this point then you will half to start working your way back through the wireing towords the heater controles until you find the problem. Using your test light. Now if you did have power going to the motor then replace the motor. Good Luck From Ernie @ RedDeer, Alberta, Canada.

Jan 10, 2011 | 2004 Buick LeSabre

1 Answer

The low/med/high fan switch on my 1985 Toyota pickup is no longer working, How do I replace the heater fan blower switch?


Hi,
Don't go there just yet ! Most heater motor speed problems relate to the heater resistor ! It's located in the ducting close to the motor assy and usually has 4/5 wires on to it and a 2 screw fixing. This componant must be cooled (hence air duct location) and is solely responsible for motor speeds ! You can check motor fan by test lamp/meter ! Good Luck

Dec 13, 2010 | 1985 Toyota Pickup

2 Answers

Heat/ac fan only blows on high


Check the heater control switch,,,,,and the number of wires at the heater motor....Some motors have more than one winding...in which case there will be three or more wires going into motor..there can be burnout in those windings and will require a new motor....check the plug which attaches to the motor....can be bad connection...or at the switch.....but if there is only two wires....then the heater switch uses resistors to slow down the different speeds...and direct connection for high speed....and the problem is definitely the switch...

Apr 27, 2010 | 1996 Lincoln Town Car

2 Answers

The fan will only work on high. Wondering if


it most likely is the blower motor resistor
the control head controls the high fan setting while the resistor controls all other speeds-first check the wiring harness-it is located under the passenger dash and it easily damaged by passengers kicking it with their feet

Feb 17, 2010 | 1998 Plymouth Voyager

1 Answer

Ac/heater fan switch problem on a 2006 jeep commander


next to the fan motor there should be a connector that has three or four wires that attached to the blower resistor. it should have two screws holding it to heater case, just pull it out and replace.

Feb 13, 2010 | Jeep Commander Cars & Trucks

2 Answers

Blower motor for heater only works on high....what do you think I need to change. Relay or Resistor.


If the heater only works on the high setting, your problem is the heater fan resistor, not the relay.

Jan 07, 2010 | 2005 Jeep Wrangler

2 Answers

Heater Fan Only Works On High


This is 100% the Blower Motor Resistor, located adjacent to the Blower Motor. This is a common problem with Dodge. I had to replace my own and several dozen others on Chyrsler's, Dodge's, Plymouth and Jeep.

Make sure you disconnect the Battery and wait for 2-minutes to discharge the Air Bag System. Remove your Passenger Side - Dash -Glove Box for easier access.

Let me know if this helped...

Apr 18, 2010 | 2003 Dodge Durango

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