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Need help finding leak

GCS on Sun August 29, 2010 7:39 AM User is offline

Year: 2005
Make: mercury
Model: grand marquis
Engine Size: 4.6
Refrigerant Type: 134
Country of Origin: United States

This 80,000 mile specimen automobile features Ford's Grand Blend Door Failure. But the AC has been fine until a few weeks ago. Over a period of a few days, it dropped off to nothing. I put a parts store can of 134a in it and the cooling came back, for a few days. That tells me it has a leak. I put two cans ot 134a with dye in it, and the cold lasted for a few days. The only indication of a leak I can find with the dye and the blue light and yellow goggles is at the cold side schrader valve, but that seems to me to be residue I failed to clean when I did not get the fitting on smoothly the first time and it spit out refrigerant for a second.

My question is, are there any common places for leakage on this model car. My first thoughts were the compressor seal, and the condenser as it sits up front and catches all of the bugs and road sand. But, I got a pretty good view of them along with all of the hoses, connections and pipes, and found nothing. The dye has had about a week to leak out.

One area of concern is I have some rust under the powder coat on the pipes into and out of the accumulator. But no trace of dye there. Also, the body of the accumulator is wrapped in a plastic shroud. One area I could not see is the evaporator. But it looks like I can access that if I remove some miserably located bolts, or maybe by just removing the heater fan and motor.

Dave in Texas on Sun August 29, 2010 10:45 AM User is offlineView users profile

Before I began the evap detective job, I'd clean that schrader valve and make positive-sure it isn't the leak-source. They have that MO. If you have a stethoscope you can prolly hear a slight/low 'hiss'. If that happens to be the fault, replace with plastic-seat type, not rubber-seat type. Years ago, I had to replace the evap on my truck....did not have a good time.

At 2, I went home with a 10. At 10 I woke up with a 2 !!

Tennessee_Timmy on Sun August 29, 2010 11:26 AM User is offlineView users profile

Might try looking at the evaporator drain for signs of dye?

Good Luck 2 ya,

GCS on Mon August 30, 2010 9:53 AM User is offline

Yup, the evap is next, but it is not easily accessible, and I was hoping that someone with experience on this particular vehicle might pop up with something I overlooked.

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