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Can anyone tell me where on my '79 A/C system, is the orifice? I have a new compressor, new receiver/dryer, and was told to at least clean out if not replace the orifice. Well, I can't find one. Not even in my shop/parts manual.

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OK, I'm over it. Where's the beer?

Just reach behind and wipe...

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FIAA!

SFPP!

If memory serves me right, older a/c systems like on the Luvs used an accumulator and not a receiver/dryer. Orifce tubes were only used with receiver/dryers not accumulators, but someone correct me on this if this is wrong.
My Gm factory shop manual for the series 10 (1980) does'nt list one either.

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1962 Chevy C-10 Stepside-Rat Rod
1990 Chevy Suburban

The only way to combat violence is with greater violence!
Trying to please everyone is way to hard, but pissing everyone off is a piece of cake!

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1962 Chevy C-10 Stepside-Rat Rod
1990 Chevy Suburban

The only way to combat violence is with greater violence!
Trying to please everyone is way to hard, but pissing everyone off is a piece of cake!

Hmm. OK thanks. I don't know the difference from one to another, but I replaced what the book calls a "tank" which is the part with the sight glass and is up by the radiator. I guess if that is and accumulator, then it won't need an orifice. But, then what will it wipe?

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OK, I'm over it. Where's the beer?

i thought the luvs used A thermal expansion valve (often abbreviated as TXV or TX valve)

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I will no longer do that thing with my tongue

I'll ask my buddy about it. IDK a whole lot about a/c. He told me to blow out all the lines and evap. and cond. with compressed air, clean or replace the little orifice and then bring it to him. He is going to vac and charge the system for me.

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OK, I'm over it. Where's the beer?

Not familiar with the Luv system but either you will have a thermal expansion valve or an orfice tube, not both. However both are located in the condensor outlet line somewhere between the condensor and the evaporator unit.

Call me, I can fax or e mail you a pic of the location of the expansion valve. If you need a new on the org part number is 94023480

My book says series 3-10 is the same
http://factory.dhgate.com/air-condition ... 93713.html

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I dont mean to sound ignorant here but what the hell are you guys talking about... I am getting ready to fix the a/c in my luv and now I am afraid to touch the damn thing after reading this.

Is the expansion valve something that should be replaced? It appeared that the old compressor had seized up. The system was empty but still sealed until I got into it.

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OK, I'm over it. Where's the beer?

The expansion valve is located in the evaporator housing located under the dash. It doesn't usually give trouble. It the compressor was sized up, usually it from a loss of oil in the system. The oil leaks out as the freon leaks out and the compressor locks up putting parts and pieces into the system." That year model used flare fitting and they weren't the best for sealing and were bad about leaking.. "The system was empty but still sealed until I got into it." If it was empty, it wasn't sealed. You need to flush out all of the system to get any junk and any oil that may be left in it. Just blowing it out won't get it.. After every thing is clean, add back the correct type and amount of oil for the type of freon you're going to use. Pull a good vacuum to be sure there isn't any leaks and that all moisture is out and charge back into a vacuum all that you can and finish off by weight.. Remember, There aren't any short cuts to AC work and don't use any sealants in a can in AC work either.

A good AC site
http://www.autoacforum.com/categories.cfm?catid=2

Gerald K4NHN
Cayce, SC

OK thank you. What I meant by still sealed, was that all the lines were in tact. The system was complete and untouched. I understand it must have a leak somewhere. The new compressor already has oil in it. I was told not to add any.

What is a good way to clean out the lines, if blowing them out is not good enough?

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OK, I'm over it. Where's the beer?

I've used lacquer thinner, brake cleaner, something that has a fast evaporating rate and you can buy the flush at the auto stores. None of it is cheap though. So what type of oil is in the compressor, for R12 or R134. How much.. You do what you think best, but I don't trust "the oil is in there don't add any"... I always drain any in there and flush out with clean oil that I'm going to use by rotating the compressor to get all of it out that I can and then measure the required amount back in for that system... Don't use any flush on the compressor... Compressors can be used on different systems and they being different sizes, so they can use different amounts of oil and freon... I don't mean to be confusing, but there are so many ways to screw up an AC system..

A good site about flushing
http://www.autoacforum.com/categories.c ... zb=2271435

Gerald K4NHN
Cayce, SC