Question about 1999 BMW 323 Series

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My 1999 bmw 323i airconditioning goes between cold and war and was just serviced. plus the sensor on the panel says -40

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The reason for a/c to go cold/warm after service is low on freon or overcharged , or it has a leak.(Sorry don't know the reason of service on your car for a/c system)
Temp. on panel -40 , ambient temp. sensor broken or wire cut off ,
very common , because it seats under bumper and can be easy tear off by curb on parking lot.

Posted on Aug 26, 2010

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Posted on Jan 02, 2017

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2 Answers

1999 bmw 323i window won't go down all the way


Your window regulator should be the problem! Dealership charges $400 per window!! Here is the solotion:
1. Order the window regulator online, it should be about $35 to $65(
2. There are good YouTube videos on that topic; and
3. You should be able to fix it ASAP!
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Friend, you've changed everything but the right thing. The temperature sending unit. It tells the computer to go into cold start mode to start the engine by putting more fuel into the engine. If this sensor is erratic, sometimes don't work, it will cause a hard start situation if not in cold start mode. Dealer cant find this because it's a manual thing and may not be showing up on his tester.

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sounds like there is not enough r134 coolant in the system and when your slowing down the compressor stops turning. Have someone add some coolant and you should be ok.

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1 Answer

2000 bmw 323i always displays -40 degrees


You ripped out your outside temperature sensor, it's located by the  right brake duct area.

Jun 28, 2009 | 1999 BMW 323 Series

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