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High Pressure Mystery

Posted: Tue Sep 12, 2017 4:54 am
by chuckwp
Trying to help out a fellow tech. in the shop. !996 VW Eurovan came into the shop with no cooling. Single A/C - front only. Technician replaced compressor, drier and espansion valve, flushed out condenser and evaporator, evacuated system and charged with correct amount of correct refrigerant. When first starting vehicle A/C works normally. However, after running a short while the high side jumps way up to 400 PSI!! Cooling fans working properly. Tried a know good pressure switch with no change. It seems like a restricted/clogged condenser but, the technician said the condenser flushed out well. Again: new compressor,drier, new expansion valve, proper charge amount, condenser fan working. Out of ideas. Input?

Re: High Pressure Mystery

Posted: Tue Sep 12, 2017 6:10 am
by Cusser
Is that a serpentine type of condenser? Those are more likely amenable to reverse flushing than the parallel flow condensers, where solvent can bypass many passages. That's why parallel condensers are most often just replaced with new.

Re: High Pressure Mystery

Posted: Tue Sep 12, 2017 5:38 pm
by chuckwp
[quote="Cusser"]Is that a serpentine type of condenser? Those are more likely amenable to reverse flushing than the parallel flow condensers, where solvent can bypass many passages. That's why parallel condensers are most often just replaced with new.[/quote
I am not sure what type of condenser it is but, that could definitely be the problem! I will tell the tech. to check into it before he tears all his hair out! Thanks for the tip.