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E320 a/c problem
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04-26-2009, 05:45 PM
Matt L
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Join Date: Oct 2005
Posts: 4,263
One way to check the duovalve is to clamp off the pipe leading to the engine. Using an IR thermometer on the pipes going to the heater cores to check for a difference in temperature (controls both set to LO) would probably work fine too.
Matt L
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