Question about 1996 Mercury Grand Marquis
It should not affect the A/C compressor. The A/C coils are actually in front of the radiator so the A/C should cool regardless.
Here's what you want the system to do. You want the Freon to maintain a steady pressure when the A/C is on. There are 2 pressure cutoff switches. 1high, 1low pressure. The compressor will cutout when either switch is tripped. This means a moderate amount of Freon is supposed to be in the system to avoid tripping the switches.
At this point your dryer tank will frost or sweat, the lines from the tank will frost too. The Freon can remove the most heat in this condition.
You can loan tools from Autozone or Oreillys with a deposit. You need to measure the pressure in the system and have the car windows rolled down and air on high to make it perform. Also use the correct "oil charge", the compressor will fail without oil.
Your compressor will not start if the pressure is below the Low pressure minimum. You may want to change the LOW pressure switch. If the compressor does not start, check the fuse or add Freon. The compressor will not run if there is too much pressure. Measure and remove Freon to cancel the high pressure switch.
When you have your pressure right everything should work providing the system was properly prepped before the Freon was added. Final note, the manifold gauges show TEMPERATURE variables for installing Freon. In simple terms, Freon is a gas that expands and if you add it in Cold weather it will expand and have higher pressure and be overfilled in Hot weather.
Posted on Apr 26, 2010
Testimonial: "thank you very much,but i would like to know what is meant by use the correct oil charge for AC compressor ? "
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Posted on Jan 02, 2017
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