heater fan problem. Anyone can help?

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heater fan problem. Anyone can help?

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heater fan problem. Anyone can help? - 4/16/2008 7:39:30 AM

billpa22

Posts: 1
Joined: 4/16/2008
Status: offline

The fan of the heater-a/c unit on my 1991 range rover is not working in the II speed. The I and III speeds work just fine. Any ideas where the problem could be? Maybe the fan relay unit or a new fan blower motor? Probably not, because as i said the I and III positions work!

Post #: 1

RE: heater fan problem. Anyone can help? - 4/16/2008 2:44:09 PM

Disco Mike

Posts: 9587
Joined: 4/27/2006
Status: offline

I believe there is a resistor pack that regulates the fan speeds and it sounds like one of your resistors has failed. Can't tell you where to find it though.

_____________________________

Mike
Retired service manager. Member of the Solihull Society, NCLR club,past member of the SCLR club and Santa Barbara 4 Wheelers.
99 D2, 3" lift, lockers, H.D. axles, 4:11 gears, Custom front and rear bumpers, Warn winch, HID lights and an Engel 45.

(in reply to billpa22)

Post #: 2

RE: heater fan problem. Anyone can help? - 4/18/2008 7:59:01 PM

Phototone

Posts: 176
Joined: 3/27/2008
Status: offline

The motor itself is a one-speed DC motor. It's speed is dependent on the voltage supplied to it. The fan speed switch connects various resistors between the battery and the motor, thus varying the speed. If one speed is not working, it is either the contacts on the switch or an individual resistor is open for some reason (burned out, broken contacts, etc.) It should be fairly easy to trace the wiring from the fan speed switch back to where the resistor array is. It may be in the duct work from the fan, some are in some cars. It is more probably dirty speed switch contacts or wire connectors.

(in reply to Disco Mike)

Post #: 3

RE: heater fan problem. Anyone can help? - 4/19/2008 11:20:32 AM

lrobin3w

Posts: 82
Joined: 9/5/2007
Status: offline

The blower fan resistor is probably your problem. It is located under the front lower windshield cowl on the right hand side.

(in reply to Phototone)

Post #: 4