Quote:
Originally Posted by M.B.DOC
Do the aux fans run? Is fuse # 44 good?

Hi, Fuse no. 44 is good. I have noticed that the aux fans do not run when I start the AC and the AC does not blow cold air, but I can see the AC clutch running. The aux fans starts after a long time sometimes by itself or by switching the AC button off & on a few times. I have also noticed that when the Aux fan starts, the AC starts blowing cold air. Also while driving the car there are various instances when the AC starts blowing hot/normal air & then again I have to switching the AC button off for a few seconds (keeping the air fan/blower running) & then turn it on to start cooling.

Connecting a set of gauges & checking the basic a/c system for correct pressures would be a good idea.

Does the low pressure line(large diameter) get cold?

If it does possibly the problem is related to the blend air door NOT closing.

That system doesn't use a heater valve. Would the system get cold if you blocked off(clamped) one of the heater hoses?

__________________
MERCEDES Benz Master Guild Technician (6 TIMES)
ASE Master Technician
Mercedes Benz Star Technician (2 times)
44 years foreign automotive repair
27 Years M.B. Shop foreman (dealer)
MB technical information Specialist (15 years)
190E 2.3 16V ITS SCCA race car (sold)
1986 190E 2.3 16V 2.5 (sold)
Retired Moderator