Where is the low pressure AC service port?
The low side service valve is located in the line that runs from the compressor through the evaporator (firewall) and up to the condensor on the low pressure (suction) side of the system.
Where is the low pressure side of the air conditioning system?
The low side, or suction line, will be the line connected to the compressor from the top or higher position. It will be cold to the touch and may be wrapped with insulation. This is where freon enters the compressor as a gas.
What causes a low pressure in a car AC system?
Possibility #2 AC low side pressure is too low because the expansion valve or orifice tube is stuck closed or clogged. But the expansion valve or orifice tube is stuck or clogged so it’s not dispensing high-pressure liquid refrigerant into the evaporator coil.
How do you add Freon to a 1999 Mercury Grand Marquis?
How to add freon to your 1999 Mercury Grand Marquis: hook up the can of refrigerant (likely r-134a) to the low pressure port. When your compressor kicks on, add freon to the correct pressure.
What kind of refrigerant does a Grand Marquis use?
Most refrigerants include a leak sealer that will seal small leaks in addition to filling the R134a refrigerant. The A/C system in your Grand Marquis consists of a compressor that is belt-driven, an evaporator and freon. If there is a problem with your compressor or evaporator, adding freon will not restore cooling.
Where do I Charge my Mercury Grand Marquis?
You have to charge it on the low pressure side ONLY. That would be the bigger of the two air cond. lines. Usually there is a port that comes right out of the plastic box that is mounted to the firewall. Look for a port with a RED cap on it.
Why is my 1999 Mercury Grand Marquis blowing hot air?
When the air conditioner in your 1999 Mercury Grand Marquis starts blowing hot air, you likely have a freon leak. Recharging the freon in your AC system is an inexpensive and easy first step to restoring the cooling capacity of your A/C system.