Mercedes-Benz Forum - View Single Post - Overheat/Aux Fans/AC Issues
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post #1 of (permalink) Old 05-22-2019, 06:22 AM Thread Starter
BenzWorld Member
Date registered: Jul 2018
Vehicle: 1989 190e 2.6
Location: Alexandria, VA
Posts: 110
Mentioned: 0 Post(s)
Quoted: 30 Post(s)
(Thread Starter)
Overheat/Aux Fans/AC Issues

Got some issues I think may be combined and want to see the correct order to fix these things. My car tends to get hot (close to overheat) when idling which is fairly common from what I've seen but want it fixed.

AC has some pressure (not sure its enough)
AC also has a leak I'm 90% sure
Low Speed Aux Fans Dont Ever Run
High Speed Aux fans kick on at 102c and cool down the engine properly
AC Compressor works and does send cool air through the vents until I get above about 85-90
Car will rise to 102c idling without the AC on on a hot day

I replaced the low speed aux fan relay and the ceramic preresistor, one of my aux fans was dead and that was replaced earlier. Can confirm both work perfectly on high speed mode.

1) Is the rising to 102 without ac on a hot day abnormal? Should the car stay below that even without ac on on a 90f degree day? Should I just go ahead and do a coolant change and/or what else to check here?
2) Should I have a shop fix the ac leak, vac and refill the system first or
3) Should I first track down the low speed aux fan issue?

I'm assuming the compressor is kicking off when the car gets hot and thats why I lose ac at higher temps. Just wondering which part of this to start working out first. I am kinda stuck on the low speed fan, any thing else to check there?
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