Question about 1995 Mercury Grand Marquis
The air conditioner on my 1995 Mercury Grand Marquis cools well, but when the outside temperature is high, it will often stop cooling after about 10 or 15 minutes of operation. It will start working again if I turn the system off for several minutes. I have checked the refrigerant level, and it appears to be normal (about 40 psi on the low-pressure side when operating).
I suspect that a limit switch of some sort is malfunctioning. There is a switch on the low-pressure line and another on the high-pressure line. Replacing both switches myself (if possible) would probably be more economical than taking the car to a shop, where I am likely to be charged $100+ just to check it out before repairs even begin.
Questions: What is causing the problem? What do the two switches do? Can either or both of them be removed and replaced without discharging the refrigerant?
It is not going to be in the low,or high side switch,the most likely problem is that the high side pressure is getting to high,check for any debris in the condenser,and radiator,and check the fan clutch out,the fan clutch maybe the problem,if it never turns on,or if it quits turning to soon,and does not re-activate,a set of gauges to see the high side reading would help in the is situation.
Posted on Jun 06, 2010
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Posted on Jan 02, 2017
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