In a message dated 5/22/2006 10:33:58 A.M. US Mountain Standard Time, [EMAIL PROTECTED] writes:
I noticed that my auxillary cooling fan was not plugged in the other day and wanted to get that fixed. The fan has never been plugged in and the AC has not worked since I got the car. After I plugged it in as soon as I started the car it ran for about 15 seconds and then stopped. I noticed that it had blown a fuse. Other point of interest is that on the repair information from previous owner it says "conversion to r134a, wire aux fan to run constantly". The car has always run under 100 degrees so it has not overheated and does not run hot. Is that normal for the fan to run as soon as you start the car ? I know that I need to check the schematic to see that the wiring has not been altered and I imagine I should check to see that the aux fan switch is working. Dan, With any performance limited AC unit, some gain can be made by running the aux fan as soon as the car is started. R134 would fit that category. Here, in Phoenix, I run the aux fan continuously, whenever the key is on, to try and get the most out of my 300SD's AC. You merely have to run a jumper from the temp sensor wire to ground to do this. Or unplug the sensor wire and ground it on a small stud or such. The temp sensor on mine is on top of the thermostat housing and is connected by a single wire, brown, I think. Why you blew a fuse is a different animal. It could be the fuse holder has been overheated so many times that heat build up at that point is excessive. Also, the aux fan is paired with another big load, either the AC clutch, or the AC fan, and the combined load is too much for the factory fuse. There is a service bulletin out for your car, and many others including my 98 ML, to switch these loads to a separately added in line fuse with more ampacity. Try a new fuse and run your aux fan with the AC for a few minutes, then put your finger on each end of the fuse holder to see if it is getting really hot. Wet your finger first! This will tell you that you should install the TSB or fix the overload, whatever it is. Keep us informed. Jim Friesen Phoenix AZ 79 300SD, 262 K miles 98 ML 320, 142 K miles
