VMC 81D Quit cooling

[Creighton]

Could be low on freon. That would mean there is a leak which would need to be fixed. Shipping from Tulsa to Eric (Global Compressors) shouldn't be much. I give Eric a call before anything else. Listed under vendors.
Creighton

[globalcompressors]

The unit is original...the compressor is not.
When the unit cools down to 45...does it shut off,
or keeps running and simply stalls out? If ir stalls,
and won't cool down further, probably low on
refrigerant...i.e. leak. If it shuts off at 45 degrees,
then... thermostat issue. Also, make sure both fans
are running.

[63StingRay]

The compressor will keep running with the thermostat turned to max cool but the temp never gets cooler than 45 degrees. Yes both fans are running. If I turn the thermostat down the compressor will stop running. Everything acts normal except it won't cool below 45.

[SIGNGUY]

I'd guess you have a leak and it's low on Freon...

[63StingRay]

A friend put his gauges on the low side and it showed only 40psi ( compressor running). Shouldn't this be a lot higher, up aroud 140 psi with compressor running?

[bubba]

Low side should be lower than that.. 28-32 maybe?

[johnieG]

A friend put his gauges on the low side and it showed only 40psi ( compressor running). Shouldn't this be a lot higher, up around 140 psi with compressor running?

Interesting, no, it should be a bit lower, depending on which refrigerant gas is being used, ( R12/vs/R134 etc.) since we don't know what refrigerant it's using, it should be between 18 to 25 PSI on the low side near the evaporator on average, and less than approximately <150PSI on the high side . in a 70-degree room air temperature.

what is the running vs idle/off pressure on the low-side?  ( the "low-side" is the large diameter copper line leading away from the evaporator directly back down to the compressor) 

[Yarochrehc]

Sounds like you might have a compressor problem. As JohnieG said the low side or suction pressure should be a bit lower, if the condenser coil is clean and all fans are running the way they should, all shrouds are in place it's probably the valves in the compressor are leaking by. When the valves don't seat properly refrigerant leaks by creating a higher suction pressure and less performance and less cooling which will probably mean a new compressor. A good refrigeration service tech. should be able to determine what the problem is for sure.

[63StingRay]

Sounds like you might have a compressor problem. As JohnieG said the low side or suction pressure should be a bit lower, if the condenser coil is clean and all fans are running the way they should, all shrouds are in place it's probably the valves in the compressor are leaking by. When the valves don't seat properly refrigerant leaks by creating a higher suction pressure and less performance and less cooling which will probably mean a new compressor. A good refrigeration service tech. should be able to determine what the problem is for sure.

I agree, I think it needs a new compressor. Any idea what and where I can get one? Would Eric at GlobalCompressor have what I need? I think I could put it in, but still haven't found anyone to service it with freon,especially R12.

[msanborn]

Yes eric can square you away.  He is extremely helpful.