2004 545I Climate control issues - BMW Forum

Queegy · 06-22-2011, 01:41 AM

So here is my issue:
A/C blower is working, cold air is basically non-existent. Hot works way too well though... I had the A/C system evacuated and recharged and it was only low by 3oz and it didn't change the performance, or non-performance of the A/C cooling ability in the cabin. I have the climate system in the I drive set to coldest, and the knobs on climate control module on coldest setting yet the system blows still cools only minimally. Weird thing is when I turn the temp knob all the way to hottest I also get cooler air but not cold air. I think it is the Climate control module or a temp sensor, or a stuck heater valve, but most likely a climate control module. What do you think might be the culprit?

brettski · 06-22-2011, 05:28 AM

Welcome to the Werkz.

Can you hear/feel the AC compressor engaging / disengaging?
Are either of the gas lines that go/come from the compressor getting cool at all?

Queegy · 06-22-2011, 05:32 AM

Thanks for the welcome!

TO answer your question I only know for certain what the AC shop stated that all was working as it should under the engine with regards to the AC system compressor. It blows a little bit of cool air in the cabin when on max or auto but only through certain ducts. the heating system kicks butt too bad I live in Hawaii and dont need a good heating system...

brettski · 06-22-2011, 06:38 AM

If the compressor and the rest of the cooling system is working then it sounds like either the electronics or one of the solonoide valves isn't playing ball.
When did it last work?
Has anything been done to the car between the last time it worked and now?
A bit of a long shot, but might be worth a go, try diconnecting the battery for 20 minutes to let everything reset to its normal state, then see if you get any joy.

Queegy · 06-22-2011, 12:02 PM

I will disconnect the battery and give that a try. The change didn't coincide with any work I had done to the car either. Where is the heater valve located in system? I would like to tap on it to see if it is possibly stuck open?

brettski · 06-23-2011, 04:39 AM

Not sur eif this will be of any help, but worth a look (maybe)?
RealOEM.com Diagram Selection

Queegy · 06-23-2011, 12:35 PM

I haven't disconnected the battery yet because of the posts I've seen stating that you can lose programs when you do. What are your thoughts about disconnecting the battery?