Question about 1993 Isuzu Pickup

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The fan controls for the heater only works in the 2 posiyion. When you put the controler on 1, 3 or 4 it does not work at all

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  • Isuzu Master
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Possible switch but most likely a blower resistor.

Posted on Dec 30, 2013

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Posted on Jan 02, 2017

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SOURCE: electrical problem with heater on 1990 isuzu trooper

heater fan does not respond to control. I tested the control switch, it is good. Fan motor is good it works with direct connection to battery. fuse is good. Can't find the problem. check the relay they are good checked the resistor it's good but no power the switch can you help thanks

Posted on Oct 07, 2008

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No heat blower moter blowing cold air,temp on max 91, fluid is full fuses are fine car temp running good in the middle motor fan work on and off like its supossed to . i just cant figure it out and BMW...


ok the heater cor needs to bet hot, if not , no heat.
you can put hand on both tubes, of the core of any car.
do so, are the they both hot.
no, (the heater valve is closed or packed up, (no service? every 2 years)
yes then the heater, controls are bad, (bad controller or the damper flaps , motors (or cables, vacuum) controls are malfing.
lets do the flow (no pun)
1: hot engine, 180F holding or more.
2: fan blows
3: hot water flowing through the heater core....
4: dampers in the right position.
just 4 checks, find the one that fails in this order and the job
is less work, and to the real cause.

id didnt go to alldata.com to look at what type of controls you have.
we can, (so can you) if test 3 passes.
some cars have core valve , find yours and make sure it flows.
other cars there is no valve. and only the dampers block heat.







Nov 30, 2013 | 2001 BMW 325i

1 Answer

Heater fan only works on 1 and 2


I would tend to look at the heater control head as a relay just passes voltage from point a to point b and you akready have voltage.

Nov 10, 2013 | 1996 Mazda Protege

1 Answer

OUR 04 TRAILBLAZER, THE A/C STOPPED WORKING, IT WOULD WORK SOMETIMES AND BLOW COLD AIR NOW NOTHING COMES OUT, OR THE HEATER TOO.. LITTLE AIR WILL PULL THROUGH IF ON THE HIGHWAY, I CAN HEAR IT CLICK OVER...


a couple of things,1 blower motor fuse.2 blower motor gone out.3 switch on fan speed control switch not sending signal to fans.after checking the fuses.next check theswitch on control panel.set ac or heater.if fan still doesnt come on then replace it.when it work and then stops working there are a lot of possiblities that caused the prob relay too not fliping over inside staying close loop.hope this helps.

Aug 16, 2010 | 2004 Chevrolet TrailBlazer

1 Answer

The heater control is not working right.... when i put the heat on to level 1, 2, or 3 no air comes out.... but it comes out only in 4..... wats the problem wit the control?


THERE IS A BANK OF RESISTORS IN THE LOOM, OR ON THE SWITCH WHICH CUTS POWER TO SLOW FAN DOWN, THAT HAS GONE, AND NEEDS REPLACING

Dec 18, 2009 | 1995 Nissan Altima

1 Answer

Heater fan control


It is under the right side of the dash. Blower resistor and relay.

Aug 16, 2009 | 1991 Chevrolet S-10

1 Answer

Fan control relay


Quite often you'll find resistor on firewall, of passenger side under hood. 1-1/2"x3" block attached to firewall. In area of where heater hoses enter.

Mar 09, 2009 | 1990 Plymouth Sundance

1 Answer

Heater Control Switch Only Works on High


It appears there is a resistor block there, either at blower connection area, or at firewall area on passenger side under cowl somewhere. It is quite common for blower to only work on high when resistor goes. Look for block, or base, 1-1/2" x 3" approx. with electrical connector to it.

Feb 10, 2009 | 2002 Chrysler Sebring

1 Answer

Hyundai coupe r/h drive heater


hi from uk your heater fan problem is most likely to be what is known as the resistor pack sometimes called the reostat and is connected to fan motor case it has the wires for fan connected this unit operates rather like an elec hob controlling amount of heat if this simplifies it for you? speeds 1 2 3and 4 gives the speed selected on fan control knob not too difficult to find and diy a replacement? and not too expensive ? these units do burn out occasionally on most cars as they age hope this helps/inspires ?

Jan 08, 2009 | 2000 Hyundai Accent

1 Answer

Heater only blows hot (well, warm) on full speed of fan


Replace the temp control on this car, it should be electrical control not cables.

Dec 03, 2008 | 2000 Ford Escort

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