Quote:
Originally Posted by Fuzzball
I had a shop check it and they evacuated the system, did a pressure test and recharged and they said it has no leaks or level problems, they believe it's electrical.
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Did they do a pressure test while the AC was acting up? If high pressure is high and low pressure low, a likely cause would be a stuck expansion valve on the evaporator.
You could add an incadescent lamp across the clutch coil and see if:
Light is on but clutch is open = failing coil
Light is off but should be on = no signal to turn it on, look farther back. If the pressures look good, you could hot wire the clutch and see if it continues to cool. Also look at the condenser fans / engine fan, if they are weak you won't get much cooling at stationary idle.
Put a light across the heater valve, I think it needs power to close. I've added a ball valve to the heater hose opposite the stock valve to reduce thermosyphon when the engine is off.
Quote:
Originally Posted by Fuzzball
I reset all the codes and have run the test a number of times and I only ever get the 416 (Coolant Circulation Pump) code activating. While I may have a pump going out, I don't see that impacting my AC.
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For a hot climate, I'd unplug the pump. If it locks up it can hurt the HVAC control head. ( My 97 SL320 is unplugged and my 97 C280 is next )
Quote:
Originally Posted by Fuzzball
I've had the car for almost 2 years and the PO advised that they had just recently had the entire AC system replaced.
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I doubt the "entire AC system" was replaced. Doing so would include
Condenser
Condenser fans ( 2 )
Compressor
Hoses ( 5 )
Dryer
High pressure sensor
Liquid Freon temp sensor
Expansion valve
Evaporator
Evaporator temp sensor
HVAC control head
Outside temp sensor
Charge of freon
and a couple of other odd bits.