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Thread: getting awful hot AC

  1. #1
    Grasshopper AJWaller's Avatar
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    getting awful hot AC

    OK Finally warmed up a few days here in ND and tried out the AC.

    Clutch does not kick in.

    On my 99 intrepid it ended up being a low pressure switch. Can I be that lucky on my 07? Fuses all good, swapped relay with fuel pump as they was the same and vehicle fired right up so ruled out relay.

    Suggestions? comments? ideas to start next?

    Could if just be that low on freon? I know it has to run to get freon into the system but good ole google article I found suggested a way to actually get freon in when the system is to low and get enough it to cycle it on and off for a full charge...

    Thanks in advance

  2. #2
    Senior Member DuRonbo's Avatar
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    Could be low on refrigerant. Need to put a set of gauges on it to accurately determine that.

    If there's a leak then adding Freon is just a waste of money. I'm guessing the A/C hasn't been run since last year? The compressor not running can be due to low charge, control issues or as you suggested the pressure switch. Either it's failed or the charge is low.
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    Super Moderator tomk's Avatar
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    Definitely need to get a gauge on it and see if it is very low on freon before throwing parts at it.

    If it is low enough that the low-pressure cutout is open when the system is not running then the system is essentially empty, and possibly has air/moisture in it. You're gonna need a pro for this.

    IIRC in gen-IIs the low-pressure cutout is done by the AC pressure transducer.
    Last edited by tomk; 05-18-2019 at 04:16 AM.
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    Durango Expert NumberThree's Avatar
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    if it's not kicking-in, it could be the clutch solenoid, or maybe just a bad connection?
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    Grasshopper AJWaller's Avatar
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    im thinking it is just so low that the low pressure switch isnt working. Got back home this morning and been raining so wasnt to bad a drive. Going to pull relay and run a jumper to hot and make sure it does kick on. Then can add some freon. Neighbor has gauges and such... Hopefully tomorrow. Will actually be driving this pig to and from work from now on (whopping 6 miles each way) as I accepted a job at home...

  7. #6
    Durango Expert NumberThree's Avatar
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    If it gets noticeably cooler when you first start it, or at highway speeds (at least, for the first few minutes), you may be on to the culprit with the low-pressure switch. Sometimes, you can whack them and they'll briefly start working again.
    But the same symptom can also be caused by the fans at the radiator. or a fouled evap core, because pre-2008's have no cabin filter. IKR!
    Anyhow, if the fans aren't running, they should be checked first, as they may be prone to failure like they are on the pre '08 Rams.. I replaced mine twice on my '02 Ram. At that time, I tracked mine down by disconnecting them, and jumping them to the battery. Finally in 2017, I traded the truck in due to that fouled evap core, which requires removal of the entire dash just to clean it.
    Regardless, it might be a good time to take the HVAC blower motor out (unplug, and remove the three #43 ithink torx head screws and it falls out), and stick a flashlight up inside to inspect the evap core fins for fouling, and clean the vanes on the blower's squirrel cage.
    Last edited by NumberThree; Yesterday at 09:52 PM.
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