A/C Aux fan

[scottiesharpe]

There is a wire coming off the A/C compressor. With the car running, apply 12v to that wire. The clutch should engage and the a/c should start building pressure. (Bubbles should float by in the observation glass on the dryer.)

Another thing...forget about R134. It is a sham put on us by 3m Corp and our bribed politicians. Once you have verified operation of the compressor, go ahead and vacuum the system for 30 minutes.

Then fill with a product called Duracool. Use the proper amount as recommended by Duracool. Your AC will work like never before!

I use this stuff in all my cars, my house, even my beermeister.

[FL318is]

There is a wire coming off the A/C compressor. With the car running, apply 12v to that wire. The clutch should engage and the a/c should start building pressure. (Bubbles should float by in the observation glass on the dryer.)

Another thing...forget about R134. It is a sham put on us by 3m Corp and our bribed politicians. Once you have verified operation of the compressor, go ahead and vacuum the system for 30 minutes.

Then fill with a product called Duracool. Use the proper amount as recommended by Duracool. Your AC will work like never before!

I use this stuff in all my cars, my house, even my beermeister.

Thanks.  I just heard about Duracool this morning.  I wish I had a beermeister.   I looked at the compressor and I think I know which wire you are talking about.  I will give it a try.

One question remains:

Does the system require full pressure to function?

It seems odd that the AUX fan and Mag clutch would both stop working at once.

[oldtimer]

Even though the system is fully charge and sufficient pressure exist or no pressure the AUX should still work  I would take the fan out and investigate or feed it direct current and check is indeed it is functional.  After charging my system and blowing cold air the AUX fan still did not engage which prompted me to remove it and discover it was frozen.  The fan should engage when the A/C is turn on.

[FL318is]

Even though the system is fully charge and sufficient pressure exist or no pressure the AUX should still work  I would take the fan out and investigate or feed it direct current and check is indeed it is functional.  After charging my system and blowing cold air the AUX fan still did not engage which prompted me to remove it and discover it was frozen.  The fan should engage when the A/C is turn on.

Here is the lastest!  Used the great link
 http://www.m42club.com/forums/showthread.php?t=17
we have to the electrical system here on the site.
1  Put the meter on the K7 relay and the related fuses.  They tested fine.
2  Put a jump wire from the fuse box to the black wire connector coming off the compressor.  Immediately the ac kicked in to full cold.

So the next step is to see where the break in connection is.  If you look at  6452-1 it does show a refrigerant pressure switch that shuts off in a high pressure and low pressure situation.  This might indicate a freon problem.  This is kinda fun for a non mech inclined owner to figure out.  In the meantime I am getting used to the heat!

More later.