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1989 240 R134 conversion 200

posted by  machine man on  Mon Jul 27 15:16 CST 2009
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last visit: Wed Oct 22 15:40 CST 2014
[RELATED]

When you say you did the conversion. Compressor and all. Describe all for us.

Starting in 1990 Volvo increased the size of the evaporator because they knew that they were headed for R-134a for future cars. There was going to be a loss of 10% percent in efficiency to top that off.

With a already marginal size system. They upgraded to the GM style system which floods the evaporator more to boot.

You may want to consider installing a adjustable expansion valve. Relocate the sensing bulb as far down the evaporator towards the fire wall as possible. Try to get the superheat set there to prevent any flood back to the compressor.

The Gm system has an accumulator there and use a balanced charged fixed orifice control.

You could add a accumulator to the above setup for safety of the compressor.

Do you know if the mechanic could have set up the evaporator shy of refrigerant flooding and that could be why it had less cooling? It may be low on charge now if the hose leaked or a leak elsewhere.

Phil






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