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DougG 
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Joined: 20 Sep 2009
Location: Mo
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 Topic: 99 Dodge 3500 ac only works on high?????
Posted: 17 Jun 2018 at 12:35pm |
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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
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chaskaduo
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Joined: 26 Nov 2016
Location: Twin Cities
Points: 5200
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Posted: 17 Jun 2018 at 12:57pm |
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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
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steve(ill)
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Joined: 11 Sep 2009
Location: illinois
Points: 81133
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Posted: 17 Jun 2018 at 1:44pm |
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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.
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steve(ill)
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Joined: 11 Sep 2009
Location: illinois
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Posted: 17 Jun 2018 at 1:47pm |
maybe something like this.....
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Like them all, but love the "B"s.
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LeonR2013
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Joined: 01 Jan 2013
Location: Fulton, Mo
Points: 3500
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Posted: 17 Jun 2018 at 10:48pm |
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One fix is haul off and hit the dash with your fist as hard as you can. Fixed my daughters.
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JohnCO
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Joined: 11 Sep 2009
Location: Niwot Colo
Points: 8992
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Posted: 17 Jun 2018 at 11:53pm |
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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"
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shameless dude
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Joined: 10 Apr 2017
Location: east NE
Points: 13607
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Posted: 18 Jun 2018 at 12:18am |
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yep….just replace the fan switch. the aqc will work the same on any blower speed
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steve fischer
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Joined: 11 Jul 2011
Location: sleepy eye mn
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Posted: 18 Jun 2018 at 7:54am |
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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,
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kenbob
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Joined: 24 Sep 2017
Location: Smithville Mo
Points: 162
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Posted: 18 Jun 2018 at 3:38pm |
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yes, the resistor, On my Grand caravan it was easy to get at and fix.
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marion
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Joined: 19 May 2010
Points: 586
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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
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JohnCO
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Location: Niwot Colo
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Posted: 19 Jun 2018 at 11:16am |
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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"
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DougG
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Joined: 20 Sep 2009
Location: Mo
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Posted: 19 Jun 2018 at 6:08pm |
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Yeah im with you John, everything is blowing up like that , ggggrrrrrrr, thanks guys
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