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kik kik is offline
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Join Date: Feb 2015
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91 964 AC/Heater fan blower no operable?

My AC and Heater fan blower is not operable?
Was working great, but just went out without any warning.
You can still here the motor clicking for AC unit.
Checked fuses - they are good!
Any guidance is greatly appreciated?

Maybe the control unit?
Old 04-10-2015, 03:52 PM
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I have the same problem. The blower will work when temperature control is all the way to cold. When i turn the temperature knob to a warmer setting, the fan stops. The engine was not warmed up so should it work once the engine is at operating temperature?
Old 02-20-2018, 01:40 PM
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Control unit.

These guys will fix it for $500 or so.
Porsche 964 AC CCU Climate Control Unit ECU 964.659.047.00, 964 659 047 00 - Specialized ECU Repair

No aff.
Old 02-20-2018, 01:59 PM
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Pull the unit and make sure it hasn't seized. I have seen the bushings get dry and prevent the motor from turning. If it has seized you can try lubricating it and working it free. usually that is all it takes if caught early on.
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Old 02-21-2018, 08:20 AM
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I have been reading if the blower in the engine compartment doesn't run the heater fans will not run when the temperature control is turned past the coolest position. My blower is not working. The first thing I will check is the fuse and then if necessary will pull the motor out to see if it is free. Due to numeous reasons my car has sat for a couple of years. It will be back on the road this spring.
Old 02-21-2018, 08:29 AM
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Mine was the same way until I learned how it worked.

Is the Temperature knob set at cool or heat?

1. If set to cool then maybe CCU if not the blower fans are shot. Very unlikely unless you have heard noise from them before. Expensive and difficult to get at. Tap three times on the blower speed knob. May start - mine did, happens every once in a while. If doesn't check out the CCU.

2. If set to heat then the rear blower must be running for the front blowers to work. If its not check the fuse and relay in fuse box in rear left. If they are ok then probably rear blower is toast. My relay was fried. Had to re-wire the socket.

OE blower parts for these are very expensive. I installed URO brand about two+ years ago and still good for 1/4 the price.
Let me know how it works out.
dj

Last edited by porsche964guy; 02-21-2018 at 03:04 PM..
Old 02-21-2018, 02:48 PM
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Today I opened the fuse panel in the engine compartment. There was a 25A fuse in number one slot, it should be 30 and it was blown. Inserted new 30A fuse started the car, let it warm up and the rear blower now works and I have heat in the car. Thanks to the forums here and at Rennlist I saved from having someone repair it. Now if I can get my shift indicator in my speedometer to work .
Old 02-22-2018, 07:38 AM
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964's are known to have creaky connections in the fuse box
Old 04-03-2018, 03:07 PM
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