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10 minutes..auto mode..Fan wont run in either aircon or heater mode…

Customer Question
Aircon works fine for 10...
Aircon works fine for 10 minutes then fan stops whether in manual or auto mode. Fan won't run in either aircon or heater mode when this happens. When it wakes up after a while everything is fine again for another 10 minutes (both hot and cold). Had unit regassed this morning but no difference. I've been told this is a common fault with the control panel. Thermostat or sticky relay? Don't dare take the control panel out (don't know how to) for fear of damaging it! Compressor and all plumbing checked out OK. 323i e46 1999 BMW.
Submitted: 8 years ago.Category: UK Car
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Answered in 9 minutes by:
6/24/2010
UK Auto Mechanic: Bill_Crosby, UK Car Mechanic replied 8 years ago
Bill_Crosby
Bill_Crosby, UK Car Mechanic
Category: UK Car
Satisfied Customers: 3,307
Experience: City & Guilds Vauxhall Master Technician & Auto Electrician Since 1993
Verified

Good afternoon, I hope I can help you.

 

You are best to use a BMW dealership or BMW specialist that has suitable test equipment to connect to the car and check all the sensor readings into the aircon control module.

 

There aren't many checks you can make without this equipment.

 

It does sound like a fault with one of the temperature sensors though.

 

Bill.

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Customer reply replied 8 years ago
Sorry but I don't count "use a BMW dealer" as an expert reply.
UK Auto Mechanic: Bill_Crosby, UK Car Mechanic replied 8 years ago

Ok use an independent BMW specialist rather than dealer.

 

You are the one that said you wouldn't/ couldn't take out the control panel.

 

You are going to maybe take it out depending on what data you get out off the ecu when you connect your scanner to the system.

 

Bill.

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UK Auto Mechanic: Bill_Crosby, UK Car Mechanic replied 8 years ago

Do you still require help with this.

 

Bill.

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Customer reply replied 8 years ago
Your "expert answer" was of no help at all. The correct answer (obtained from a forum for free) The BMW 3 series has a stock fault with the final stage resistor or 'hedgehog' which controls the fan motor. It is situated in the drivers side footwell. I repkaced this today and the aircon works perfectly. Since your answer bears no relation to the information I obtained elsewhere I am not willing to pay you. Now you have the correct information which you can use for another custome and I am sure you will be paid by them. Thank you.
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