AC ??? 2001 136,000 mi

[ezdavie]

A/C Compressor started a "knocking" noise. Compressor came from salvage last July. Noise increase in line with rpm's. Was still blowing cold air. Stopped and got another compressor at salvage (different yard). Have not installed yet. Almost immediately the noise stopped - but the cold air stopped also. It's not hot but it's not cold either.

What would you expec?

[Blue Bowtie]

Is the compressor clutch still engaging?

[MT-2500]

Originally Posted by ezdavie

A/C Compressor started a "knocking" noise. Compressor came from salvage last July. Noise increase in line with rpm's. Was still blowing cold air. Stopped and got another compressor at salvage (different yard). Have not installed yet. Almost immediately the noise stopped - but the cold air stopped also. It's not hot but it's not cold either.

What would you expec?

Remember proper installation when replacing compressor.
Replace reciever dryer and check expansion tube.
If the compressor has blowed it usually leave trash all over the system.
Most will need a complete flush at the least and a vacume pulled on the system and the right and correct amount of oi and freon added.
http://www.ackits.com/merchant2/merc...uct_Code=66773

http://www.ackits.com/merchant2/merc...e=DIY-STARTER1

http://www.ackits.com/merchant2/merc...ode=DIYADVANCE

Here is a link for more good help and info.
http://www.autoacforum.com/

Also say no to them wal mart recharge kit.
Wal Mart DEATH KITS

You cannot properly and safely recharge an air condition system with them.

The one side stop and go gauge does not tell you what your system is doing or is over charged or undercharged.
A overcharged or malfunction air condition system can reach over 500 lbs of pressure.
Enough to blow up that can or system and freeze you at first and the burn you or blind you and if any propane /butane in there blow and light you up.

The stop leak crap and who knows what kind of oil in the kits there will stop your system for sure.
Just like pouring super glue in it.
And some kits even contain freon with a butane mixer.
Good for a big blast.

If you are going to do it do it right and safe.
Here is what you need to start with.
http://www.ackits.com/merchant2/merc...uct_Code=66773

In the older days you could just throw in a can and go.
But over the years just adding freon is getting harder to do.
Newer systems have to have the correct amount of freon down to the ounces.
Most will need pumped down and vacuumed down and the right and amount of oil and a set amount freon charge installed to get the air to cool right and the system to last.
If an air condition is low there is usually a leak that needs fixed and also a lose of lubricating oil from system.
Also air and moisture enters a low system
If you are going to try to do it get the proper type air condition gauge set with the low and high side gauges.
Hook up the gauges and get a reading with compressor running at idle and at 2000 rpm on the high and low side.
Post back pressure reading and we can help you.
MT

[ezdavie]

Thx for your inputs. Installed new (salvage) a/c compressor - evacuated the system and installed 2.2 lbs of new 134a.

Everything is fine and cool in Casa Grande, AZ !!!

By the way, always be careful when resetting dc connector. Check once and then check again to make sure the pins match.