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check that the heat is not on because it will win in a fight with the cooling.check the diaphram of the solenoid in the heater valve[called mono valve].simple way to do first check is to use a pair of needle nose vise grips and clamp off the heater hose on the exhaust side and then run the a/c.if this car converted to 134 cooling not that good anyway and heater valve being open will kill it.
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