yes, another 348 ac thread

I looked through the achives and didn't niotice anyone else who got the "E7" code after a few minutes of operation. Anyone know the fix?

 

Thanks. The fan speed control unit- Is it a separate unit, or contained within the control panel, (or circuit board). Also, how much is one?
Thanks.

 

BTW- Whenever I turn off the car, the unit DOES reset. It works for a few minutes, then, I get the old "E7".
Jeff

 

MW,
Thanks LOTS. I'll have a look at mine to see if, indeed there is a loose connection. If not. I'll clean the pin connectors. If this doesn't do it; you've just made a sale! You are VERY helpful. Thanks.
Jeff

 

ok, I finally had tiime to play with the car a bit today.
The AC fan problem continues:
Today, for the first time, the entire environmantal unit failed. I knew immediately it MUST be the "ol" 30 amp fuse. I uncovered it and low and behold, it was blown, of course. I decided it would be a good time to do some common sense diagnostics:
I replaced the fuse, and unplugged the fan speed control unit. I turned on the ignition. Interesting, the entire unit was DIM. No buttons worked. I plugged it back in and viola! the unit shined brighly and all buttons worked including fan speed- perfectly. BUT not so fast!!! The fuse blew again, immediately as soon as I selected "AC".
I repeated the experiment again to rule out od timing. Again, with a fresh fuse, all functions worked perfectly about 10 times on each button, (except of course the ac, I saved it until last). I finnally selected "ac" and POP! OK, so now what is the failed component? Some help please?

 

Paul,
Super to hear from you. I'll hopefully be back in London next month.
I'll take your advice and check the wire for the ac clutch. If it is in good shape, I'll check the draw it creates with a digital multimeter. I'll post the group and let you know what I find.
Since the engine has been re-installed, the car simply accellerates viciously. I think James has harnessed all 500 horses and they like to run!
I hope all is well with you.
Jeff

 

Thanks for the advice, Danial.
This is a course of action I'd not considered. I'll put it in priority order and will most likely move the location of the fuse while I'm at it. I think under the right side access cover would be a far better location than it's current one- under the carpet liner. Thanks.
J

 

Thanks for the great link! I've never been to this site previously. I'll preform this simple upgrade today.
Jeff

 

OK, I did the fuse upgrade. The big gold fuse looks nice, BUT after about 5 minutes of ac, (varying fan speed and multiple on-off's), the fuse blew. Next, I'll measure the draw and inspect the wire responsible for the clutch engagement. Who know's? Maybe I'll have to replace the compressor clutch?
Has this happened to anyone else?

 

perhaps a bit more advice from the pros?
I have played with the car some more now. I disconnected the ac compressor control wire at the compressor itself, (small red wire going into a fairly heavy fitting, to a small green/black wire coming out). Then, I turned the iginition on, car not running, I selected fan motor on. Fine, I then selected "ac" and "pop" blew the 30 amp fuse again and the panel went dim, (not blank). No "E7" but also no control.
Looks like a wire chase?
Advice?
Anyone?
Anyone?

 

Wow Paul! Did you build these cars in a previous life?
I'll pull out my schematic and check. Thanks.
Keep the suggestions coming!

 

I knew what you meant. Yes, I disconnected the electro magnetic clutch. I have now chased down the schematic. I beleive the culprit to be the power supply for the fan. It is also on occastion refered to as the fan speed control. It actually has 2 sets of plugs. Oddly enough, it controls not only the fan, Environmental blow fan), but also recieves input from the relay that feeds the ever blowing 30 amp fuse.