Posted by Mark Robke on July 11, 2014 at 18:36:18 from (71.31.17.252):
In Reply to: Kubota AC Repair posted by psbhouston on July 10, 2014 at 10:09:05:
I am not familiar with your Kubota, so I don't know if your condenser uses an electric fan or uses the engine fan. But first off=idle your engine up to 1200 rpm or so, hold a rag up to the front of condenser.The rag should suck up to the condenser all across the the face- move the rag all across it. If it does not draw the rag up every where, clean it/fix fan problem.If you have poor air flow and the condenser looks clean, you can have dirt between the radiator and condenser and/or the charge air cooler. You have to separate them to clean. This would be causing high head pressure. Even with a properly charged system, high head pressure will cause hi suction side pressure, and, poor cooling because you are not getting rid of the heat absorbed because of poor air flow across the condenser. Air in the system usually causes only high head pressure and normal low/suction side.Poor air flow thru the evaporator should cause low suction side pressure. If your air flow thru the condenser is good, and your pressures still read high, I would change the expansion valve(or the orifice tube) and THE DRIER.If you did have air in the system a new drier is a must.It is possible to have an expansion valve stuck open, but this should mostly cause high low suction side pressure.I would guess you have a block style expansion valve which are the simplest/most common style used. Mark
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