'02 C240 AC warm at idle - Mercedes-Benz Forum
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post #1 of 31 (permalink) Old 06-05-2019, 11:09 PM Thread Starter
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'02 C240 AC warm at idle

Installed new Auxiliary Fan Assembly, system has been vacuumed, recharged, pressure tested, dye tested - NO leaks.
Any suggestions?
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post #2 of 31 (permalink) Old 06-06-2019, 03:09 AM
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The cheapest and easiest thing to replace first is the expansion valve... next comes the compressor.. What's the spread on the "high, low" at idle ?... What's the spread with engine rev.ed up?...
Also, you need to make sure the blend door, in the heater box is not a problem.. Do you have a MB scanner?
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post #3 of 31 (permalink) Old 06-06-2019, 05:45 AM
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If AC works fine at speed, this suggests that there could be a problem with the fan(s). Check the function of the fan clutch.
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post #4 of 31 (permalink) Old 06-06-2019, 06:19 AM
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Originally Posted by Hirnbeiss View Post
If AC works fine at speed, this suggests that there could be a problem with the fan(s). Check the function of the fan clutch.
Ya, Fans...That was my first thought too, but he stated "new condenser fans".. I guess one should not assume that they running just because they are new.. Also, fan clutch.. ya.. that's a no brainer.. But there is no mention of the engine over heating at a stop.. Obviously .. I maybe assuming too much..
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post #5 of 31 (permalink) Old 06-10-2019, 07:52 AM Thread Starter
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If by “spread” you mean temperature difference...cold is about 58 degrees on highway and 101 at stop.
post #6 of 31 (permalink) Old 06-10-2019, 07:53 AM Thread Starter
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No engine overheating
post #7 of 31 (permalink) Old 06-10-2019, 07:55 AM Thread Starter
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Air conditioning only blows hot at long stop lights, drive thru ATM etc..., school pick up and drop off line...
post #8 of 31 (permalink) Old 06-10-2019, 08:39 AM
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If by “spread” you mean temperature difference...cold is about 58 degrees on highway and 101 at stop.
Nope... I mean the high side pressure (psi) reading and the low side, at idle.. Then at a high rpm... Also, 58 degrees is not "cold".. high 30's, low 40's (maybe high 40's and low 50's if it's really hot ass outside) is what should be coming out of your vents.. ARE YOUR CONDENSER FANS COMING ON ? Also.. You need to check your engine fan clutch.. WITH THE ENGINE OFF!!!... reach in there and give the fan a spin.. It will free spin, but a good clutch will have a bit of drag on it.. If it feels like it's just totally free spinning, you need a new fan clutch..
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post #9 of 31 (permalink) Old 06-11-2019, 03:30 PM
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Originally Posted by bobby735 View Post
Also.. You need to check your engine fan clutch.. WITH THE ENGINE OFF!!!... reach in there and give the fan a spin.. It will free spin, but a good clutch will have a bit of drag on it.. If it feels like it's just totally free spinning, you need a new fan clutch..

The engine suction fan on the C240 is electric and doubles as the condensor fan. No clutch to check.

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post #10 of 31 (permalink) Old 06-11-2019, 03:41 PM
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Air conditioning only blows hot at long stop lights, drive thru ATM etc..., school pick up and drop off line...
So take it to an AC shop and have it recharged

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