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84 silverado GM converted to R134

BigTruckDriver on Wed June 30, 2010 2:55 AM User is offline

Year: 84
Make: c-10
Model: silverado
Engine Size: 350
Refrigerant Type: 134
Ambient Temp: 95
Country of Origin: United States

What should be used to convert it to R134? I live in Tx so summers here can be brutal, with days in 110 and nights at 100. So I would like to get the system running top notch. I have replaced the accumulator , compressor and O tube ( with stock), and had system flushed, but the system seems barely exceptable. I do have to run the system maxed out on the highway just to not break a sweat though. What are other upgrades I need to do to get this thing to cool better. I have read here (search button) about switching the o tube to a ford blue tube? Also that there is a condenser made for r134 thats sold at the local auto parts. Should I run a HEAVY DUTY blower motor and HEAVY DUTY fan and clutch set up? Thanks for any help.

mk378 on Wed June 30, 2010 9:13 AM User is offline

How was the conversion done? What are the pressures? Block off the heater lines to be sure there's no reheating. If you have low airflow from the cab vents, check the fan and evaporator for debris.

Bottom line is those trucks will be a lot better in hot climates running R-12.

HVargas on Wed June 30, 2010 12:06 PM User is offlineView users profile

You had a good start in replacing all the parts and flushing everything out. What amount of R134a did you charge it with. Typically start with ~80% of the factory R12 charge and check your pressures from there. Do you have gauges to check the pressures? Switching to the blue orifice tube can help some but your biggest 2 factors are going to be checking the fan clutch to make sure it is in good working order. If not replace it with an OEM unit. Next you are going to want to use a Parallel Flow Condenser. We have these available in many different sizes. You will have to modify the ends of the lines to make it fit and do a little work to install it but it is going to work much much better with the R134a. Your factory 6mm condenser is not designed to work with R134a and cannot transfer the heat needed to properly cool the refrigerant. Those 2 thinks alone should greatly improve your cooling at idle and cruising down the highway.

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