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Dodge Ram Climate Control



  • luxelloluxello Posts: 5
    Thanks for the updated information. Actually, I was able to fix our problem relatively easily. After taking the dash apart (14 hours worth of work) and not solving any problems, I decided to try to clean the evaporator coil. After disconnecting the negative battery cables and taking the blower motor and the blower motor resistor out (located under the passenger dash area), I lined the passenger floor board with garbage bags and went to work. First, I sprayed an evaporator coil cleaner on the coils (you can't really see them, you can just reach in the area where the blower motor came out and squirt as best as possible. Let sit for 15 minutes and then used an old toothbrush and another small brush to reach in and carefully scrub. Then I took a garden hose and washed it off carefully. The vast majority of the water drains out of the air condition drain, but when I went too fast some came back and drained inside onto my garbage bags, which I had "funneled" out the open passenger side door. Since my husband does construction and works in very, very dusty conditions, the evaporator coil got so clogged with dirt and grime that it couldn't blow the cool air across the coil. Maybe, hopefully, this will fix someone else's problems, too.

    For what it's worth, 4 years ago we had the same problem and paid $900 to have the evaporator coil replaced. I suspect that if I had figured this out before then, I would still have that $900.
  • corkscrewcorkscrew Posts: 254
    Thanks for posting the solution to your problem. This will give others with the same problem someting to look for.
  • bulldog29bulldog29 Posts: 1
    05 Ram 1500...A/C is cold, compressor appears to be fine. The problem is when you go from low to high on the blower, you can hear the motor increase but the amount of air barely increases. And it's really loud and and vibrates when on high. Help! It's hot in Texas!
  • paul192paul192 Posts: 1
    i have a 2005 Dodge ram 1500 A/C work fine till truck is driven several hours then when truck is shut off then started back up the A/C is on an light lit up on control unit but no air is blowing out of vents then it will come on as you are driving down the road sometime it will not come on till the next day. have all ready replace the control head unit twice from dealer. three out of the four doors replaced and actuator.
    can anyone help solve this problem obviously the dealer cant!!!!
  • I found out that when the blower motor is not running, that it was the ignition switch that was not passing any current to the fan switch. It was the last thing I checked. It was intermittent at first then completely failed. Sounds like you should check the power out of the ignition switch. (when the blower motor is not running as it should.) It is designed so that the fan will not work unless the ignition is turned on. The switch cost approx $35 at autozone. It is much easier to access than any of the other changes you made. It only requires dropping the plastic cover around the steering column.
  • luxelloluxello Posts: 5
    From a fellow Texan! I know it's hot, that is why I was so determined to fix our A/C in our Dodge '03 Dodge 3500. Same problem with blower motor, although ours had gotten so bad the air was not blowing cold any longer either, along with the blower not blowing very hard. Please read post #367, it explains what I did that fixed our problem. I hope you find this helpful.
  • 2bigjohn2bigjohn Posts: 1
    In my 2005 Dodge, we have dual A/C controls. Drivers side works fine, passenger side works fine on heater (hot) but does not blow cold (just medium) air. I think it is the blend motor and/or door. But I need to know where it is on the passenger side. Any help would be much appreciated.
  • I have a 2001 Dodge Ram 1500 5.2 V8, and I'm having some problems with the A/C. When I start the truck, I immediately turn the air conditioning unit on to max air. After doing this, within minutes, I can hear a suction noise like something closing. Then nothing but hot air comes out. In the meantime, nothing was touched on the controls. The controls will not work properly at all. Even if I turn the whole thing off then on again, it still blows out hot. If I shut the truck off, then back on, sometimes cold air will come on right away. Does anybody have any ideas?
  • jeffs69jeffs69 Posts: 1
    Same problem as #373
    Drivers ac ok passenger not so good, have replaced all blend doors. Someone please respond
  • wilburpwilburp Posts: 1
    I have a 05 dodge 1500. The temp dial that goes from cold air to hot air and the dial that changes from floor to vents to dash..etc works fine... problem is the dial for speed of air doesnt work at all. blower motor works fine. Is there a variable speed switch that may be burned out?
  • luxelloluxello Posts: 5
    Does the blower motor work on high only? If so, the blower motor resistor is probably out. It is located under the dash toward the center of the truck from the blower motor. It is easy to replace and costs about $45 from auto parts store. It has a plug in that can easily be taken apart and two screws and that is all it takes to replace it. Also, before you start to take the old one out, be sure to disconnect the negative battery cable to protect your electronic system. Once you have replaced the switch (if that is what you think your problem is), reconnect the battery cable. It's a pretty cheap stab in the dark, if nothing else!
  • drflexedrflexe Posts: 1
    Same problem as 373 & 375
    i see everyone is looking at the blend doors. Dose anyone think that it could be the Ambient Air Temperature Sensor ? The blower seams to be working fine. The A/C had done this in the past I thought that the evaporator was freezing up we would shut down the sys for 5min and the sys would work for an hour or two then repeat this happened when the truck was new then this started happening I think that it is the T-Stat. Is there a T-Stat for both sides?If anyone has another idea PLEASE HELP :sick:
  • question4youquestion4you Posts: 2
    edited July 2010
    I have a 99 Ram and the blower motor is working on high only. I replaced the blower motor. The old one ran for a few stopped you could hit it and it would start up for a while. So now that the blower works great.. its only working on High. So maybe the resistor or relay is out? I bought the ram manual.. and it dose not show where or how to replace.
    Dose anyone have any ideas to this problem? and if so how to fix and fine the part.
    Any help would be great.
    Thank you!!
  • Has anyone attempted to fix this problem on their own? I have a 2004 with the diverter door problem and am retired. I can't afford to have a dealer repair it so I have to do it myself. :cry:
  • luxelloluxello Posts: 5
    It can be done. We (my husband and I) took our dash apart to get to the diverter door. I would strongly recommend that first you purchase a service manual for your vehicle. I purchased a manual on CD for a 2003 Dodge for about $15.00. I wouldn't attempt to do it without. It is quite tedious but if you follow all directions in the manual, you can do it (and with confidence). :)
  • corkscrewcorkscrew Posts: 254
    Here is a link to dodge hvac problems. Read this page to understand the system. The home page has a link to a video that will aid in getting at and diagnosing the problem. The DRBIII scan tool will also diagnose the problem, but that means a trip to the dealer.
  • I have a 99 Ram and the blower motor is working on high only. I replaced the blower motor. The old one ran for a few stopped you could hit it and it would start up for a while. So now that the blower works great.. its only working on High. So maybe the resistor or relay is out? I bought the ram manual.. and it dose not show where or how to replace.
    Dose anyone have any ideas to this problem? and if so how to fix and fine the part.
    Any help would be great.
    Thank you!!
  • corkscrewcorkscrew Posts: 254
    See message #377 and go to google images to see a picture of the resistor.
  • mhcimhci Posts: 2
    1998 dodge 318 auto reg cab. I was told that I can take off the compressor and install an idler type pully to replace it at a fraction of the cost. Has anyone done this and where can I purchase such an item.
  • slyhogslyhog Posts: 2
    my ac is driving me nuts, we have checked low side pressure switch, high pressure switch, mixer door actuation. it is a 1999 ram 1500 and the ac sometimes works, when it does decide to work if it kicks out for any reason, ie... kickdown on highway, climate control knob moved to hotter position, or any other reason the compressor will not kick back in. it has a full charge, all the switches have been checked and mixer door is sealing right. I need some help, dodge person has spent over 35 hours trying to find out what is wrong with it but it still isnt right. it seems like the dealer guys are parts replacers and not mechanics.
  • Hey guys i dont know where else to post this but hope yall can help me with my 2006 Dodge Ram Nightrunner which is a great truck, but over the past 4 years I've put over 105,000 miles on it and it seems that every time now that i push the brakes the truck starts to shake (steering and cabin) I just got the brakes replaced at 100,000 and also got it realigned as well, however I have not gotten a service since 98,000 miles, is this whats causing my truck to be like this? Has anyone experienced this either with a 2006 Dodge Ram? Also will a tune up fix this problem either?we replaced the rotors as well back in june is it a tune up?
  • My 2001 did the same thing - it would run fine for awhile then quit, then come back on with no apparent cause - got a compressor out of salvage for $75 and it works fine now.
  • amyskamysk Posts: 1
    I have a 2007 1500 Ram V8. Wether I am using the heater or the air conditioner and I put the dial on the floor setting air will only blow out of the defrosters and not on the floor. What could be the problem and if there is a part that needs replaced what is the name of the par? I do not want to take truck to dealership so I need to know what needs to be replaced on it. Thanks for you help.
  • I have the same problem in my 1998 dodge ram.everything you stated looks good.Now what ? I've been reading it could be my pvc valve ( which I'll check tomorrow ) or possible my mode control vacuum switch.Any wisdom that you can shoot my way ?
  • michaels_dadmichaels_dad Posts: 8
    edited August 2010
    If it were the ignition switch, wouldn't all the accessory components not work? I'm having the same problem, fan quit. Pulled the fan and applied 12v and it worked fine. Replaced the resistor, but no power to any of the legs on the resistor connector. I was able to get voltage to the fan connector for a moment today while playing around under the steering column...Straight wired the fan to a cig lighter cord for a temp fix, but I'm a bit concerned about overloading the circuit or causing a fire. Mine is a 2005 Ram 2500.
  • Thanks for posting this. I too was quoted a $680 repair from Mrtin Dodge in Bowling Green KY. After reading your email today I spent 10 minutes tops and followed your instructions and my problem is fixed. How much do I owe you? You know the mechanics and service manager know about this easy fix. I can only assume the service manager is paid on commission.
    Thanks again.
  • No charge. I am glad to know someone even read the easy fix.
    Have a cool day!
  • My 98 Ram diesel 24 valve is always running the air conditioner. No matter what position the dash switch is in the air conditioning clutch engages, runs for a normal duration then disengages and repeats the cycle all over again. The rest of the dash switch positions work correctly except the air conditioner is always running. Please give me a clue whats going on. The vacuum line from the dash control is operating a switch somewhere in the climate control system.
    Anybody have info to fix.
  • Hey, I hope someone can clarify what my problem might be. Ive read about heat on passenger side but not driver but I have the occasional problem where heat blows out of mid vents and floor on drivers side but cool on passenger(all vents) and also cool on defrost both sides. Then without warning it will go away and blow hot everywhere. I just discovered that my upper rad hose is plenty hot but my lower hose is cool to touch right after driving at 100kph for 1/2 hour. Temp gauge is just under halfway up, and there is plenty of heat in the cab. Rad overflow is full but cant check rad until it cools. This problem has been going on for almost 6 months now. There is nothing odd about the heater controls or the way the air blows out other than the temp. Blend doors? Clogged heater core? Bad thermostat? Toasted heater controls? Any Ideas? 2006 Ram 1500 4x4 w/ cruise and dual climate control. Thanks. BTW my AC works fine, its not super cold but blows fairly cool for summers in western canada.
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