i have a 2006 mercury that the ac has been working fine. yesterday while driving, the ac quit blowing cold air and would pull the engine rpm down 1000 rpm when at idle when the compressor kicked in. Installed gauges and the high side went to 400 or more and the low to 130 or peged the gauge when the compressor kicked on. compressor kicking on and off about every 5 seconds or less. High side line got hot as hell after less than 5 min. Noticed the engine cooling fan not coming on with ac on high, which it normally does. hot wired to fan and it does work. changed the cooling fan control module, and it did not help the fan issue. changed the head temp control sensor, and still fan will not come on. why all of a sudden are my compressor readings so high? it just about stalls the engine when the compressor kicks in at idle. thanks for any help anyone can give me. no one around here works on this stuff anymore. closest place is 50 miles away.
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Fan is the issue! Watch engine temp or you'll be a pedestrian can forget having A/C.
Get codes read a sensor isn't sensing it's not suppose to reach 400PSI for most wet it down watch #s fall but figure a way to defeat the system it's going to self destruct till you can find why.
FAN SHOULD SPIN (ENGINE OFF, KEYS OUT) BY A STICK DON'T PUT YOUR HAND THERE IT SHOULD COAST BET IT DOESN'T,
Tom
MetroWest, Boston -
Do NOT run the A/C until you get this fix, You WILL blow a hose, and if you head is anywhere under the hood, you could be blinded by refrigerant when it does.
You didn't say what model so I can't look up what it has.
With no cooling air across the condenser the refrigerant can't condense and the pressure keeps building.
Without access to what controls your system, I can't go further. I would suspect a HVAC control is supposed to shut the system down at the pressures you are seeing.
If there is a compressor clutch, disconnect the wire so it can't come on until you fix it. Not only can you burst a hose, you can fry the compressor (Compressor is cooled by returning cool refrigerant, which isn't happening in this case) and end up with "black death" as the nylon rings melt and get passed though the system.
The problem is not (yet) with the A/C portion of the system, but with the controls, which a unique to each vehicle mfg. If you don't have manuals and wire diagrams, likely best left to someone who does. It is essentially an electrical problem, not a A/C problem.Comment
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O/P! Don't use the car this way! C/B confirmed if anything don't get maimed by this, please!
Tom
MetroWest, BostonComment
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