AC ISSUES

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Calvert86

Junior Member
Joined
Jun 27, 2015
Posts
5
Reaction score
3
Location
Phoenix, AZ
Ram Year
1998
Engine
5.9
I have had more than a few dodge trucks however this is only my second 2nd gen. I bought this one off of a buddy and have been putting work into it to bring her back to life. The fan in the cab kicks on and off (when turned on) randomly. At first it would stop working when giving the truck gas going up a mountain, etc...now it hardly ever kicks on, only very randomly. I live in Phoenix so AC is a must. I feel cool air pulling through the vents but that fan wont kick on. I have replaced the fuse, the resistor, and the blower motor with no luck. Does anyone else have any ideas? Need some help to get this diagnosed otherwise this truck will be sitting the next 6 months until it cools down. Thanks so much guys.
 

wellmje

Junior Member
Joined
Jul 10, 2019
Posts
1
Reaction score
0
Location
Oklahoma
Ram Year
2014
Engine
5.7 Hemi
I have a 2014 Ram 1500 Lone Star. Sometimes it will work and then sometimes it will just stop and not come on for a while.
 

DRTDEVL

Junior Member
Joined
Nov 20, 2016
Posts
14
Reaction score
3
Ram Year
1980
Engine
360
The fan is running. Check the defrost vents when this happens. If its coming out there, your HVAC vacuum check valve failed. Simple and cheap fix.
 

CWhatMexy

Junior Member
Joined
May 29, 2019
Posts
12
Reaction score
8
Location
Virginia
Ram Year
2020 1500 Laramie 4x4
Engine
HEMI 5.7L
The fan is running. Check the defrost vents when this happens. If its coming out there, your HVAC vacuum check valve failed. Simple and cheap fix.

Im not a mechanic but which way does the check valves are to flow? I know the location of them and just changed them but I think one is failed or there may be a leak near in the hoses near the engine.
 

DRTDEVL

Junior Member
Joined
Nov 20, 2016
Posts
14
Reaction score
3
Ram Year
1980
Engine
360
If you blow through one way, but can't the other way, they are good. Make sure that the direction that you cannot blow through is toward the firewall.
 
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