Got a mercedes 240d 81 year with r12 ac system. Anyways, from as long as my dad owned it in 90 something it blows hot air at idle and takes a few minutes at half throttle to make cool air. It never really has gotten cold and that was blamed on Germans not making good ac systems. THe best time it works is at night at about 70 degrees outside
Its been serviced, switched from r12 to 134a and back to r12.
Anyway, it still does not make cold air and always smell a sweet smell in the car. It was checked a few weeks ago by a place that does not do ac service and they said it was ok.
I have ordered some freeze 12 and sealer off the internet to put in the system to give it a try, assuming the system is low.
I believe from my reading the system works like this. Compressor makes the gas hot and high pressure, condinser makes it cooler and a liquid, this liquid goes into the accumulator/receiver dryer and pools as it goes into the oricice or expansive valve into teh evaporator in the car making cold air. If the freon pools in the accumulator/dryer it triggers a sensor to turn off the compressor to keep it from sending liquid to the compressor causing damage, right?
Then the gas goes from the passenger compartment back to the compressor to be recompressed.
I am only to assume that it only cycles the compressor at night in 70 degree weather that its "low" on freon.
I got a kit and going to hook up the basic meter to it and check the site glass this weekend. I was wondering if anyone had any opinions or experience with this? I would love to get the ac to work at idle and can either assume its either low on freon, compressor doesnt spin fast enough to make enough pressure or its just a poorly designed ac system from the start.
Its been serviced, switched from r12 to 134a and back to r12.
Anyway, it still does not make cold air and always smell a sweet smell in the car. It was checked a few weeks ago by a place that does not do ac service and they said it was ok.
I have ordered some freeze 12 and sealer off the internet to put in the system to give it a try, assuming the system is low.
I believe from my reading the system works like this. Compressor makes the gas hot and high pressure, condinser makes it cooler and a liquid, this liquid goes into the accumulator/receiver dryer and pools as it goes into the oricice or expansive valve into teh evaporator in the car making cold air. If the freon pools in the accumulator/dryer it triggers a sensor to turn off the compressor to keep it from sending liquid to the compressor causing damage, right?
Then the gas goes from the passenger compartment back to the compressor to be recompressed.
I am only to assume that it only cycles the compressor at night in 70 degree weather that its "low" on freon.
I got a kit and going to hook up the basic meter to it and check the site glass this weekend. I was wondering if anyone had any opinions or experience with this? I would love to get the ac to work at idle and can either assume its either low on freon, compressor doesnt spin fast enough to make enough pressure or its just a poorly designed ac system from the start.