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E36/7 Z3 (1996-2002)
E36/7 Z3 Roadster, Z3 coupe, Z3 M Roadster and Z3 M Coupe talk with our gurus here.

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  #1  
Old 12-21-2009, 02:58 PM
tjh54 tjh54 is offline
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2001 z3 heater problem

I had some water damage from rain water soaking the floorboard (about 1/2 inch deep) causing the airbag and dsc light to be on. The shop told me that the computer is not working and this is causing my heater not to function .Could this really be the cause?

Last edited by tjh54; 12-21-2009 at 04:16 PM.
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Old 12-21-2009, 03:53 PM
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The Z3's heater is completely manually controlled, as far as I know.

The fan speed selection is done electronically through a computer. The selection of heat, and vent combination is done through manual tension wires.

A the temperature selection knob breaking is a common failure in the Z3. If the temperature selection knob doesn't move at all, or moves very easily, its likely that the arm behind it has snapped, or the tension wire is caught.
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Old 12-22-2009, 09:06 AM
tjh54 tjh54 is offline
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Thanks wildag the fan is blowing cold air and I have the temp set to high. It looks like I need to find a new mechanic or do it myself.
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Old 12-22-2009, 09:26 AM
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I am about to attempt this very repair. I will take pictures.
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Old 12-22-2009, 09:43 AM
tjh54 tjh54 is offline
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Thanks Mpire, that would be a great help.
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Old 12-22-2009, 10:36 AM
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Quote:
Originally Posted by tjh54 View Post
Thanks wildag the fan is blowing cold air and I have the temp set to high. It looks like I need to find a new mechanic or do it myself.
If no hot air is coming out of the vents, its one of these things:

1) The heater core is broken
2) The door that switches between hot and cold air is stuck
3) The tension wire has come loose of the door, or at the control knob end
4) The knob that pulls the tension wire is broken

Number 4 and 3 are most likely. Three happens a lot, and four is easily noticeable as stated in my post above.

You can access the HVAC control knobs by removing the stereo. Search this forum for those instructions. The HVAC controls pop back into the console. You can twist them away from you to see the tension wires on the bottom. Takes small hands and a lot of patience, but you can do it.
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Old 12-23-2009, 10:45 AM
tjh54 tjh54 is offline
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Thanks again Wildag I will give that a try.
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