Model: Grand Marquis
Engine Size: 4.6
Refrigerant Type: R134a
Ambient Temp: 95
Pressure Low: 60
Pressure High: 150
Country of Origin: Mexico
Hi and thank you in advance for any help anyone can provide.
The problem started when I had the compressor replaced 2 years ago. They replaced also de accumulator and orifice tube, but the car was left with a problem at idle when the AC became warm. Compressor has been replaced two more times, the system has been flushed also. At highway speed the AC works fine and discharge air is about 40-45 F, but when idle it goes to 60-65 F.
Two days ago the shop replaced the OT with an orange one (it had a black one) and the AC is worse now. The sticker states a 1.08 kilogram refrigerant capacity and it was charged with exactly 1.0 kilograms. Even at highway speed the discharge air is now about 50, and about 70 when it idle and the transmission is in gear. The above mentioned readings were taken when transmission was in park, when shifted to drive, they were low: 70; high: 170.
ACKits site catalog specifies the replacement compressor with a 4.5 inch pulley (114 mm.) but I measured the one installed and it is a 5.0 inches pulley, is this a problem?
The condenser auxiliary electric fan works, and the fan clutch has been recently replaced with a factory one, it also is working well.
Again, thank you kindly for any help.
Sorry, high side was 250 psi, not 150 psi.
What kind (brand) of compressors are they using? I think if you had a clogged O tube one of those times, it's now time to change the condenser. Your low side is to high also, looks like this compressor has bit the dust also.. You're gonna need to start fresh, find a shop that specializes in AC repair and have them check it, I would also check the O tube again, and if any debris is on it, change thre condenser along with system flush and compressor..
Freedoms just another word for nothing left to lose
Unfortunately I don't know the brand of the compressor, it has a couple of bar code stickers attached to both the compressor and the clutch but no part numbers or brands. The various repairs have been outsourced by he shop so I'll have to check whit them abut the clogged OT. I was kind of making up my mind into replacing all components as you advise me, and I'm pretty sure that's what I will end up doing in a couple of weeks.
I understand condensers are too intricate to be effectively flushed so I'll have it replaced too, should I replace the evaporator or can it be easily and effectively flushed?
Thank you for your kind advise!
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