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1973 Jimmy with 2003 parts?

rufusbooth on Thu July 17, 2008 11:30 AM User is offline

Year: 73
Make: GMC
Model: Jimmy
Engine Size: 6.0 L
Refrigerant Type: r134a
Ambient Temp: 110
Pressure Low: na
Pressure High: na
Country of Origin: United States

Well, here is the story. 73 GMC Jimmy CCOT system that is wimpy at best given the size of the vehicle. The system when finished will be r134a.

I am making some changes to the car and was hoping for your opinions.

I am installing a drive train from a 2003 Cadillac escalade (donor car had rear AC) into the 73 including the a/c compressor and parallel flow condenser which is significantly bigger than stock.

Here are the questions:

1.Is there such a thing as “too much” condenser? Will I have problems running a condenser that large?

2.Will running the new (2003) compressor designed for rear a/c be a problem in a car without rear a/c

On a separate tangent I am an A/C fiend and prefer my cars to resemble meat lockers. :-) Given I will have the system completely blown apart I am throwing around the idea of switching the system over to a txv system in order to get as much out of the evaporator as possible. Thoughts? Even worth it?

Thanks in advance for everyone’s valuable input.


brickmason on Thu July 17, 2008 2:31 PM User is offline

The larger the condenser the better off you are.

Txv systems are by far much better than CCOT systems because the evaporator pressure is regulated more precisely.

Using the compressor intended for rear air will not make any difference are far as the cooling capabilities.

Just another brick in the wall

Had a little mule I fed him castor oil and every time he jumped the fence he fertilized the soil

rufusbooth on Mon July 21, 2008 10:16 PM User is offline

Thanks for the reply Brickmason, The little knowledge I have of AC systems told me that a larger condenser would not hurt me but I am no expert! :-)

With regards to converting to a TXV system I suppose I would need to do the following things:

(Quick list off the top of my head)

Remove Otube from inlet of evaporator and add connector for TXV valve.
Attach temp sensor from TXV valve to outlet of evaporator.
Remove accumulator from low side of system
Add receiver/dryer to high side of system between Condenser and TXV valve.
Various high and low pressure switches (needs research)
Lots of custom lines.

That sound about right? missing any major steps?



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