63 A/C help

[Harry S.]

My brain is stuck it needs help.

Last summer I had a high pressure problem with the A/C. It was so bad it blew the hose off the input side of the condenser. I determined that the expansion valve was jammed shut and the STV needed a rebuild. To be safe, I replaced the expansion valve, installed an STV bypass and replaced the dryer.

It got hot enough here today to turn the A/C on so I did. I made it about two (2) miles and the same hose blew off. It has to be a high pressure problem, but where. I know anything is possible but can the evaporator or the compressor clog and cause the pressure problem. I'm using 134 at the moment.

Thanks

Hot and sweaty!

[Edward J.]

Re: 63 A/C help

Harry, On the line that the hose blew off on does it have a barbed fitting?

[Harry S.]

Re: 63 A/C help

Harry, On the line that the hose blew off on does it have a barbed fitting?

If you mean the hose clamp with the extension that hangs over the line and, yes, it's there.

[Edward J.]

Re: 63 A/C help

Harry, the barbed end is a edge on the metal line that holds the hose from slipping. If you can take a pic. and send to my I-phone. I will let you know.

[Harry S.]

Re: 63 A/C help

Harry, the barbed end is a edge on the metal line that holds the hose from slipping. If you can take a pic. and send to my I-phone. I will let you know.

On their way!

[Harry S.]

Re: 63 A/C help

After consulting with Ed, I have an incorrect high pressure side aluminum tube leading to the condenser. There are essentially no barbs in the one I have and it will not hold the high pressure on a hot day. I'll look for a new fitting and a new freon line. This should fix the problem.

[Richard M.]

Re: 63 A/C help

Harry, It's nice when you get a definite solution, and a relatively simple one it sounds.

Glad you found the problem. Good thing you've been using R134A !!! I just had to re-R12 the wife's '72 Jag. Yike's that's expensive stuff.

Is that a special GM only fitting, or can you get something locally?

Rich

[Harry S.]

Re: 63 A/C help

Harry, It's nice when you get a definite solution, and a relatively simple one it sounds.

Glad you found the problem. Good thing you've been using R134A !!! I just had to re-R12 the wife's '72 Jag. Yike's that's expensive stuff.

Is that a special GM only fitting, or can you get something locally?



Rich

Thanks, the part is available from Old Air Parts for $32.00.

[Joe R.]

Re: 63 A/C help

Harry,
Sorry about your run of bad luck. First a Tonawanda block and now an Old Air Products Hang on AC unit!
Maybe you should consider Barrett-Jackson in January instead of golf in Florida.

JR

[Harry S.]

Re: 63 A/C help

I ordered the aluminum tube so all set there. I need to also replace the associated high pressure rubber hose as it was nicked when it blew off and I'm sure the inside is scored.

Anyone have a source for a single hose with the correct lettering? I really don't want to send LIC $125.00 plus shipping for a set!

Thanks

[Harry S.]

Re: 63 A/C help

Does anyone have the specifications for fan belt 3840397? It's the A/C belt.

Thanks

[Edward J.]

Re: 63 A/C help

Harry, corvette central list it as 57"

[Richard M.]

Re: 63 A/C help

Does anyone have the specifications for fan belt 3840397? It's the A/C belt.

Thanks

Harry, corvette central list it as 57"

Yes......
15/32 x 57 according to the P&A 31 Truck catalog....HERE

THIS says it changed to 3888404 in Oct 1968.

[Harry S.]

Re: 63 A/C help

Yes......
15/32 x 57 according to the P&A 31 Truck catalog....HERE

THIS says it changed to 3888404 in Oct 1968.

Well 57" just doesn't fit. I'll start looking into pulley sizes.

[Richard M.]

Re: 63 A/C help

Does anyone have the specifications for fan belt 3840397? It's the A/C belt.

Thanks

Harry, corvette central list it as 57"

Well 57" just doesn't fit. I'll start looking into pulley sizes.

Argh, and you thought belts were confusing? I hate pulleys. Especially when there's no good list of specs anywhere.