Shops, Barns, Varmints, and Trucks - 99 Dodge 3500 ac only works on high?????

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99 Dodge 3500 ac only works on high?????

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Topic: 99 Dodge 3500 ac only works on high?????

Posted By: DougG
Subject: 99 Dodge 3500 ac only works on high?????
Date Posted: 17 Jun 2018 at 12:35pm

Got a 99 Dodge 3500 and the ac only works on the high fan blower setting ? Anyone know what could be going on here ? Smells like something is getting hot too, thanks

Replies:

Posted By: chaskaduo
Date Posted: 17 Jun 2018 at 12:57pm

I had one that the fan resistor for the switch was bad and only worked on high for both heat and air. It didn't smell , and was a different dodge. The resistor was the coil type and in the fans air stream. HTH

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1938 B, 79 Dynamark 11/36 6spd, 95 Weed-Eater 16hp, 2010 Bolens 14hp

Posted By: steve(ill)
Date Posted: 17 Jun 2018 at 1:44pm

not familiar with the Dodge, but FORD and CHEVY both use a resistor pack to vary voltage for 1-2-3-4 speed fan motor. To keep it cool, the resistor pack is normally stuck inside the duct air flow.. On a lot of trucks, you lay on the passenger floor and look up under the glove box and there is a small " block" with a 4 pine wire harness going to it.. It bolts to the underside of the air duct and the resistors stick into the air flow.

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Like them all, but love the "B"s.

Posted By: steve(ill)
Date Posted: 17 Jun 2018 at 1:47pm

maybe something like this.....

https://www.ebay.com/itm/Blower-Motor-Regulator-Resistor-For-1994-2008-Dodge-Ram-1500-2500-3500-4720278/281634901216?epid=8017276061&hash=item4192bf8ce0:g:v6oAAOSw~Q9bAgQF" rel="nofollow - https://www.ebay.com/itm/Blower-Motor-Regulator-Resistor-For-1994-2008-Dodge-Ram-1500-2500-3500-4720278/281634901216?epid=8017276061&hash=item4192bf8ce0:g:v6oAAOSw~Q9bAgQF

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Like them all, but love the "B"s.

Posted By: LeonR2013
Date Posted: 17 Jun 2018 at 10:48pm

One fix is haul off and hit the dash with your fist as hard as you can. Fixed my daughters.

Posted By: JohnCO
Date Posted: 17 Jun 2018 at 11:53pm

Oh Boy Steve, I had to go and look at that thread you posted. Now I'll be bugged by Ebay for the next week for all things Dodge! My own fault!

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"If at first you don't succeed, get a bigger hammer"
Allis Express participant

Posted By: shameless dude
Date Posted: 18 Jun 2018 at 12:18am

yep….just replace the fan switch. the aqc will work the same on any blower speed

Posted By: steve fischer
Date Posted: 18 Jun 2018 at 7:54am

I worked for dodge for 20 years I would say resister ,when they go out it will only blow on high so you don't lose all speeds ,high does not use resister,

Posted By: kenbob
Date Posted: 18 Jun 2018 at 3:38pm

yes, the resistor, On my Grand caravan it was easy to get at and fix.

Posted By: marion
Date Posted: 19 Jun 2018 at 5:17am

change blower motor also, motor going bad will only run on high and burn up resister

plug on motor may be melting, mine melted off

Posted By: JohnCO
Date Posted: 19 Jun 2018 at 11:16am

Sure enough, I'm getting ad's for Dodge heater control switchs.... aargg!

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"If at first you don't succeed, get a bigger hammer"
Allis Express participant

Posted By: DougG
Date Posted: 19 Jun 2018 at 6:08pm

Yeah im with you John, everything is blowing up like that , ggggrrrrrrr, thanks guys