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On mine, if I tried to call for a high fan in heat position, the front blowers would kick off. Hopefully, yours won't do that being a completely different unit without the A/C.
The jumper process doesn't work on early cars, with or without the resistors. For a/c, the front fans work okay unless you turn the temp **** all the way up in which they shut off. For heat, the front fans do odd things, randomly cycling on and off. I ended up updating to a later model ccu and providing a dummy load to get everything to work as it should.
I did the jumper trick and with my '90 model (and the 964 659 047 00 CCU) it works fine. Dash fans keep running when I up the temperature.
I did the jumper trick and with my '90 model (and the 964 659 047 00 CCU) it works fine. Dash fans keep running when I up the temperature.
I'm stumped. I tried the jumper method on my '90 C2 with AC, CCU 964 659 047 00, and the AC fuse kept blowing. I just installed the relay based on SunLion's post in this thread (thanks SunLion!), and every thing seems to be in working order. https://rennlist.com/forums/964-foru...olution-5.html I need to drive the car to see if there are issues with the fans cycling, but I can't wait to pull that blower motor out of the rear and shave off another ten pounds!
I'm stumped. I tried the jumper method on my '90 C2 with AC, CCU 964 659 047 00, and the AC fuse kept blowing. I just installed the relay based on SunLion's post in this thread (thanks SunLion!), and every thing seems to be in working order. https://rennlist.com/forums/964-foru...olution-5.html I need to drive the car to see if there are issues with the fans cycling, but I can't wait to pull that blower motor out of the rear and shave off another ten pounds!
Strange, drove the car a couple of times since the bypass install and front blowers work fine. Enough heat without the rear blower (mind you, it's been between 5 and 10 degrees celsius overhere the past weeks so no arctic circumstances :-) )
Strange, drove the car a couple of times since the bypass install and front blowers work fine. Enough heat without the rear blower (mind you, it's been between 5 and 10 degrees celsius overhere the past weeks so no arctic circumstances :-) )
Twelve degrees here yesterday, and the heat works perfectly. Two newly installed front blowers help. Ten pound weight savings, however, was illusory. The blower motor weighs 5 lbs. 14 oz. RS bypass duct weighs 1 lb. 2 oz. for a net weight reduction of 4 3/4 lbs. But any weight reduction at the rear of the car is a plus, and the engine bay looks much better.
DavidWhite -
how did you add the Dummy Load to the CCU to get it to run without rear blower or relay bypass. Really need a little help.
My car came with the heater bypass and when I hit the defrost button, the fans would blow on high for a few seconds and then shut off. I then installed the bridge relay (964-610-184-00) in the engine compartment and the defrost now works perfectly.
Thanks kindly for your answer, greatly appreciated. Found the answer I was looking for after looking at wiring diagram for 2 days and running a few test. You just need to feed 12 volts to the yellow/green wire on the back side of the CCU to by pass.
again THANKS
04-05-2011, 02:57 AM
