The a/c works fine on short trips. On longer trips, however, the ac quits blowing after 1 1/2 to 2 hours. Turning ac off for an hour and then re-trying does not work. Has to sit overnite to work again. Any ideas?
Sounds to me like the A/C clutch is no good and out of adjustment.You should goto your nerrest junkyard and get a used assembly take the clutch off then you learn how it comes off and install it on yours the save the pump for later use if needed. The clutch should only have a .010 air gap after install between th inner elctro magnet and the clutch plate it's self.
In the lines there is a thing called an oriface tube which is an inline filter that could be getting clogged it is found by finding the three indents in the high presure line around the condenser next to a conecting point that is strait.
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That may be tough to diagnose.
You would need to check voltage at the compressor and the relay when it stops working.
Does the blower quit working? Such as the air quits coming out of the vents? Or does it quit blowing cold air out of the vents, and it turns to warm?
First: If the blower quits working and the vents quit blowing air entirely, I'd be skeptical of the blower motor resistor. The blower motor resistor basically redirects the flow of electricity over different coils that add or take away resistance, thus slowing down or speeding up the blower wheel - which in turn increases or decreases the amount of air coming through your vents. If the blower motor resistor goes bad, you can experience two different scenarios.
First scenario: You lose a certain speed or multiple speeds, example: high speed works (4), while low and medium speeds do not (1 and 2).
Second scenario: The blower motor will not kick on. The blower motor resistor can get too hot and actually create too much resistance, not giving the blower motor enough to speed.
Second: If the air is blowing out, but is not cold, check to make sure your compressor is kicking on. If you look at your pulleys, on the front of the motor (where the belt is), you should see one that hose three or four round nubs protruding off of it slightly. While the vehicle is running (and you're experiencing the problem), check to see if those nubs are spinning. If they aren't, then your compressor has shut off.
The Milan should have two fans in the front behind the radiator. One of those fans is for cooling down the engine, while the other fan is for cooling down the fan AND the AC Compressor. If your AC Compressor is on, one fan should be running at all times. If your compressor is running and that fan is NOT running, then it may be that the AC compressor is overheating and shutting off, thus giving you warm air. If that's the case, you can remove the fan motor and have it checked/replaced. Good luck!
SOURCE: Battery completely dead within 1-2 hours
Disconnect the negative side of the battery. Hook a volt meter on the negative cable end, and hook the positive end of volt meter on the negative post of battery See what it reads. If it reads 12 volts, pull fuses one by one, and replace until the volt meter drops down. Whatever fuse you pull, and the voltage drops down to 2 volts, that is where the problem lies.
SOURCE: AC PROBLEMS 1996 GRAND MARQUIS
Definately needs inspection and service. Sounds undercharged with refrigerant. Low charge may also cause noisy compressor. Good luck
SOURCE: 1992 Mercury Grand Marquis FUEL LEVEL SENDING
the sensor is located inside the gas tank, you can access the sender from the front of the tank, just make sure the tank is less than 1/2 full or gas will gush out when u remove the sender retainner ring on the tank to remove the sender, u will need the car on a lift to do this...
SOURCE: 1999 Mercury Mountaineer, heater/AC fan no longer blowing
I would check the fan first disconnect the electrical connectors on it and use a pair of home made jumper cables and run it from the battery. If it works move unto relay if it doesn't you've found the culprit.
Next check relay in the fuse box. Coolant tempertant switch(CTS) aka thermal switch and its circuit. CTS is usually located in the water jacket by the t-stat.
SOURCE: AC blows hot air but AC compressor works
if the compressor works and your freon is charged it may be the blower flapper door....disconnect battery for 10 minutes and then re-connect to reset the electronics that control the flapper
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Two things to do in this situation, depending on your actual problem.
Try the fan on high. The resistor for the lower speeds may be going. I had to replace the resistor board.
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