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rear air installation

badfish on Wed January 09, 2008 9:53 PM User is offlineView users profile

Year: 62
Make: chevy
Model: wagon

considering putting rear air in this vehicle and looking for a little advice. plans are for a late model chevy engine,something from the LS family. would it be possible to use two aftermarket under-dash units each having an expansion valve,one under the dash, the other somewhere out back? it seems most dual evaporator systems have an orifice tube for the front and an expansion valve for the rear.

what compressor would be suited for this application? i beleive the HT6 and V7 compressors are commonly found on LS engines.

is this a bad idea?dont mind a challenge if it is possible,thanks.

JACK ADAMS on Thu January 10, 2008 1:15 PM User is offline

Nice choice, nice to see those old Chevy’s back on the road. Any of the compressors will work, as long as you go with a new compressor. This way the system is clean and reliable. As for the rear a/c, our 10020 can be modified to use (4) duct hoses with louvers. This is a TXV system and you are correct most OEM rear a/c systems use the TXV. This unit can be covered but will need an intake vent for recirculation of air. If you can post some pictures of the location of were you are thinking of mounting as well as some measurements, we may be able to suggest something more to your needs. Hope this helps.

Edited: Thu January 10, 2008 at 1:16 PM by JACK ADAMS

badfish on Thu January 10, 2008 8:53 PM User is offlineView users profile

thanks for the reply,all parts used will be new as this will be a complete restoration. a big concern i have is how to control evaporator temperature. if this was a single evap. unit would use a thermostatic switch to keep from freezing up,but what should be done in the case of dual evaporators?will one switch be sufficient in front unit or do you use two switches, one in each unit?
thanks

JACK ADAMS on Fri January 11, 2008 10:01 AM User is offline

On a dual a/c system you will only need a single switch for Hi/Low pressure and a thermostat/cycling switch on the front evaporator, as long as you are using a TXV. Systems with rear orifice tubes will need a shut off solenoid to prevent freezing on the rear a/c system. Hope this helps for you to understand better on how the system should be hooked up. Good luck!

Edited: Fri January 11, 2008 at 10:02 AM by JACK ADAMS

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