HELP! BradK Or Somebody? Help Me Think?

I'm so tired I'm rummy and can't even think.

1066 air conditioner. Straight ahead external type expansion valve system with pressure switches.

A few days ago, it was working just fine, then a condenser fan started to scretch. Then it, just as fast, stopped and all seemed okay.

But later in the day, I notice that it isn't cooling like it should and I figure it needs topping off so I started adding some freon; the first can had the sealer (cure that slow leak, ya know).

On the second can, it starts cycling and then stops coming on. Compressor won't come on for only an eyeblink and then off again for a long, long time. Okay, check it and the high pressure switch is opening. Ah Ha! Bad pressure switch!

Jump across the switch and then the compressor blows off. Whoops! Too much pressure! Gotta be that silly expansion valve. Take it out and can't see a thing wrong with it.

Should have added that before I pulled the expansion valve I foundd that the condensor fan motor is locked up. Fixed that, but still too much pressure.

When I emptied it, seemed like it took forever to drain down.

I'm startin' to think that I shot myself in the foot and liquid locked the goofy thing and that fan motor was the trouble all along?

Allan

Very likely.

Yep,you answered your own question.A little too much juice in the old gal.Suck her back down and start over and should be business as usual.

On an unrelated note,what's your take on the teflon coated front pump/converter bushings offered for say a '60-E? I ordered one(ordinary) along with a kit,band,etc for the latest build and that's what I got............

The fan probably quit, the system pressures were then wrong and you overanalized it to oblivion. We all learn when the dang mechanism bites us in the extremities. Jim

Thanks Brad,

Didn't even cross my mind. Last time I choked one down was back in the days before the pressure switches. Guess I was waiting for the pump to lock up and slip the belt. :>)

Oh heck yeah! Ya can't get too much teflon. 'Course there's a slug of lube oil there anyway (can ya say 700-R4 which couldn't handle the overflow?) but still, sure lengthens the bushing life, I'd think.

Allan

BUY yourself a set of gauges. They are cheap used as most guys use reclaimers in the repair shops. You are going to scrap a few hundred dollar compressor by liquid locking it. Many of the newer one you get one time to liquid lock them. They will break the rods real easy.

Can't argue with ya on that one.

But hey! Good news is that I now know that the 465 lb blowoff on the compressor sure seems to work okay. :>)

Allan

Yep, fer sure!

That whole series of events (this sympton causes this, that symptom causes that) led me straight down the draw until I looked up and I had locked myself in a box canyon. :>)

Hardest part of the whole derned deal was working up on that roof in the 101° heat yesterday. Think maybe all that hot metal fried my brain. :>(

Oh well, the condensor and evaporator sure got a good cleaning out of the process and we'll start all over again this morning.

I gotta get that tractor in the field!

Thanks,

Allan