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Foam in dryer

Mcgiiver on Sat July 23, 2011 12:29 PM User is offline

Year: 1995
Make: Toyota
Model: Corolla
Engine Size: 1.6
Refrigerant Type: R134a
Ambient Temp: 96
Country of Origin: United States

The car basically was used very little for many years, 1995 car with 30,000 miles. The A/c lost its charge. Refilled the system using an aerosol can of R134a with a pressure gauge on it. Refilled to recommended pressure based on ambient temp. Cooling works fine. Center vent temp is 57 on a 96 degree day at idle. Problems with AC on another vehicle led me to look closer at this one. As best as I can measure the temp of the pipes at the firewall from evaporator measure 119 on small pipe and 90 on the large one. Both in and out pipes on the dryer feel the same temp. Here's the rub, the sight glass on the dryer shows clear foam,which does not go away when the engine rpms are raised. Is this a problem I should be looking to fix? As said, the cooling performance is great. Compressor is not excessively noisy.

JJM on Sun July 24, 2011 12:18 AM User is offline

Doesn't the manufacturer of the "refill kit" provide support for these issues?

A foamy sight glass used to be an indication the receiver dryer dessicant has broken down and is circulating through the system, but can't tell that now with R-134a - a foaming sight glass can be normal. But after 16 years, the receiver should be replaced - cheap insurance.

Then again, whatever cheap insurance you might have with replacing the dryer has completely gone out the window by using one of those "refill kits" as if an A/C system is a fuel tank that needs to be refilled.


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