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E85 / E86 Z4 (2003-2008)
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Old 08-11-2019, 07:43 PM
iteachtheatre iteachtheatre is offline
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Location: Lufkin, TX
Join Date: Aug 2019
Posts: 1
Mein Auto: 2003 Z4 Roadster 2.5i
Bypass Heater Core

I live in Texas and was just gifted with a 2003 Z4 Roadster 2.5i. It is a work in progress. The AC is fully charged and the compressor is working fine but I am getting really hot air with the heat on and medium warm air with the AC on. I believe I am having an issue with the blend doors and I don't have the money to fix right now. I would like to install shut off valves to the heater core because right now I don't need heat, and probably won't for 90% of the time I drive. Any helpful tips? Which shut off valves to use? Which hose on the reservoir goes to the heater core? Thanks for the help!
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Old 08-13-2019, 10:39 PM
Andyz4 Andyz4 is offline
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Location: Orlando, FL
Join Date: Mar 2018
Posts: 237
Mein Auto: 2006 Z4 3.0si
What happens when you start the car up from cold, i.e. before the car has a chance to make any heat? Does the a/c get cold then? If not, it is likely an a/c problem, not your blend doors or heater.
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