On our 2004 Ford Mustang V6, the AC only partially cools. I do not see a sight glass in the system. AC compressor kicks in and out roughtly every 10-15 seconds. Line is verly cool. What are the high and low side readings for this vehicle?
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run the engine at fast idle run the ac in maximum cooling and after a few minutes check the sight glass if bubbles present in the sight glass there is insufficient amount of refrigerant you'll need to recharge freon and about 10 ml of refrigerant oil PAG is best.
Several things ... best guess, in order: 1. (very likely) Radiator fan is not blowing (turn on car and a/conditioner. When compressor kicks in, the radiator fan must blow). If it ims not blowing, the radiator fan motor may be burned out ($40). 2. Check / replace "cooling fan" fuse ($1) and / or "cooling fan" relay switch ($7). 3. Radiator clog (possible) Hope this helps!
Make sure the radiator pressure cap is the correct one and that the hose is not soft--check the lower hose and heater hoses for softness as well. They should be firm, but not hard or cracking. The temperature sensor is reporting normal operating temperature, so it and the thermostat are working correctly (hot water would blow out of the radiator if it were stuck). Check the cooling fan for free turning and no noise. Check it's grounding connection. Check the fuse box for blown fuses to the fan and to the A/C compressor. Make sure all the relays and fuses are firmly pressed into their sockets. Check the A/C compressor clutch winding for resistance--should not read infinity. Does the blower motor for the heater/A/C run when either is turned on? The A/C switch on the dash may be defective.
If the compressor doesn't engage..it could be the pressure switch and or it could also be low in a134 to the system.
Best would be to jump the clutch wire from the compressor (i.e. direct tht wire on the positive terminal or any nearest available 'live' point).
Let the car's engine run and also the AC control switch to "ON' postion having the blower fan inside the car running.
Once done all this check if the compressor is now running and if theres cooling inside the car and also best would be to check the sight glass for any bubbles , this is normally situated around the filter/drier at around the condensor infront of the radiator or within the area.
If the compressor runs and theres cooling thn theres a problem with your pressure switch, if theres low cooling thn you may need to recharge the a134 and run a leakage test.
Hope this helps!
You might not have enough R134A in it the system should hold 3 - 5 lbs of pressure if I remeber right. But if the clutch is kicking in then its working but you might not have enough R134A. Buy the kit that has the pressure guage with a trigger on it so you can add what you need. When you fill it turn car on and ac on high then fill it. When ac is off the clutch should spin freely if not then your compressor is junk. As for the slight grinding noise just to make sure with CAR OFF turn the clutch on the compressor and make sure its not rubbing the pulley on the compressor.