95 E300D ac not cooling on highway.

s_sprry

New Member
Joined
May 12, 2009
Messages
5
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0
Location
maryland
Your Mercedes
85 300d, 95 E300D
my 95 e300d ac cools ok when sitting at idle (40-45 degrees out from vents) but the temp goes up 10-15+ degrees when on highway. I know the compressor is on when on highway because if I hit the econ button the temp goes up to outside temp or above. Also if the ac fan is on high the temp goes up 10+ degrees. Since it's cooling ok at idle then freon level should be ok? Could this be a bad expansion valve or bad mono valve or weak compressor?

Thanks
 

television

Always remembered RIP
Joined
Mar 14, 2005
Messages
164,073
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Age
87
Location
Daventry
Your Mercedes
2002 SL500, 216 CL500, all fully loaded
to test the mono valve turn the air con off and set the controls to the lowest setting and the air coming in should be cold when the engine is at 90c, if the air is warm then the valve is not closing
 


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