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HI all,
I have C180 2000 merc, I have a problem that when i turn the AC/heater on, its giving normal air from my side and a hot air from the passenger side.

so any one can tell me please how to fix this problem.

thank you very much
 

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Check the dual/duo valve, as I believe that we have two heater cores. One for the passenger and one for the driver. Too bad we don't have dual control.

It's in the engine compartment, on the passenger side, near the fire wall. One outlet hose may be hot and one cool. The inlet hose will be warm/hot.
 
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