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1995brave's avatar
Jun 12, 2018

It's too hot! AC quit.

2012 Ram went to work Friday morning AC working great. Got out of work 9 hours later (98 degrees out) started up the truck, turned on the AC knew it would take a little while to cool down, drove all the way home and it never cooled down. Picked up one of the recharge kits with low pressure gauge. Followed directions, compressor turning on, gauge shows in the green, high side line getting very hot, not getting cold. Picking up full set of gauges tomorrow from HF to check out high side pressure. Any ideas on what could be stopping it from working? Did a google search with no real help everything was for Gen 2 and 4 Rams, mine is Gen 4.

26 Replies

  • Not overly knowledgeable on this stuff.. wouldn't the failure mode of the evaporator be that it leaks or is there some other way it can cause trouble?
  • Update, blend door is fine, compressor clutch is turning on and off as I turn the AC on and off. Fans are all running. I'm down to the expansion valve or actual compressor. Won't know until I get the gauges tonight. Hope it's not the evaporator core, that requires the dash to be pulled out.
  • I had a similar problem with a Dodge Charger. The compressor fuse would get hot and stop working. Replaced the fuse and all was fine.
  • My guess would be the blend door stuck so there's always heat.
    Might be a one time hiccup and work fine tomorrow!