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Heater control no power to heater control switch

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The heater fan in 2008 uplander will not work


Does the switch works in other modes ( ac, def ) If not , ck power & ground at the fan itself in all modes., If OK R/R the fan. If the fan only loses power or ground in heater mode look toward the wiring------switch control. Good Luck.

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Why is my heater blower motor not running?


If you got the motor to run, then whatever feeds that motor electricity is the culprit. Check the switch.

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All 3 heater control wire harnesses overheat and melt switches


Bring the power supply in to one of the switch boxes (one hot, and one neutral), on a #14/2-wire cable. Then, run a #14/3..-----------------------------------------------------------------------------------------
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Jan 15, 2013 | 2001 Jeep Wrangler

1 Answer

Heater controls


If you mean the fan switch is not turning anything, you'll have to replace the blower switch in the dash. If the switch turns but nothing happens, you'll have to check the resistor and fan relay for power.

Dec 18, 2012 | 1995 GMC Jimmy

1 Answer

Heater and airconditioner control on mercery grand marquis


If the fan will not run on ANY speed in your Grand Marquis, the problem is most likely NOT the control switch.

Check for power and ground at the blower motor connector. If power and ground is present, replace the blower motor. Otherwise, the problem is most likely a failed blower speed control module (VERY common). The blower motor speed controller is located in the A/C evaporator housing just below the heater hoses.

Note: It is also common for a bad blower motor to CAUSE the controller to go bad. You MAY have to replace BOTH.

May 17, 2012 | 2001 Mercury Grand Marquis

1 Answer

1992 323 mazda want blow heat out


REPLACE THERMOSTAT.IF ALREADY DONE.CHECK HEATER BLOWER MOTOR SEE IF POWER GOING TO HEATER BLOWER MOTOR.IF YES BLOWER MOTOR BAD.IF NO POWER GOING TO BLOWER MOTOR CHECK AC AND HEATER CONTROL FUSE AND CHECK BLOWER MOTOR FUSE AND RELAY IF ALL IS GOOD CHECK SEE IF POWER GOING TO AC AND HEATER CONTROL SWITCH IF YES THE AC AND HEATER CONTROL SWITCH COULD BE BAD.

Nov 10, 2011 | 1991 Mazda 323

1 Answer

Heater and air stopped working on my 2000 Ford Focus zx3


CHECK BLOWER MOTOR FUSE AND RELAY.SEE IF POWER GOING TO BLOWER MOTOR YOU HAVE FAULTY BLOWER MOTOR.IF BLOWER MOTOR FUSE AND RELAY OKAY.IF NO POWER GOING TO BLOWER MOTOR BUT POWER AT AC AND HEATER CONTROL SWITCH. BLOWER MOTOR HAS POOR GROUND OR AC AND HEATER CONTROL SWITCH IS BAD.

Jun 12, 2011 | 2000 Ford Focus

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

I have a 2000 ford E350 van with front and rear air. the front blower motor runs at low speed, The front blower still runs on low even when the knob is set on medium or high. I do not know where the...


it's either the blower motor switch or blower motor resister. Resistor ?Heater Blower Motor Switch Removal Remove the battery (10655) ; refer to Section 414-01 . Remove the battery tray. Remove the screws. Remove the battery tray. Disconnect the heater blower motor switch resistor connector. Remove the heater blower motor switch resistor (18591). Remove the two screws. Remove the heater blower motor switch resistor. ----------------------------------- Switches Removal Disconnect the battery ground cable. Remove the center trim panel; refer to Section 501-12 . Remove the control assembly. Remove the screws. Remove the control assembly. Remove the A/C-heater function selector switch knob. Disconnect the vacuum harness connector. Disconnect the A/C-heater function selector switch connector. Remove the A/C-heater function selector switch. Remove the screw. Remove the A/C-heater function selector switch. Remove the temperature control switch knob. Disconnect the temperature control switch connector. Remove the temperature control switch. Remove the screw. Remove the temperature control switch. Remove the heater blower motor switch knob. Disconnect the heater blower motor switch connector. Remove the heater blower motor switch (18578). Remove the screw. Remove the heater blower motor switch. ----------------------------

Mar 31, 2009 | 2007 Ford E-350 Super Duty Length XLT

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