Hot under the collar

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billybob

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Check fuse, then Duo valve.
My 300ce had the same problem turned out that the resistors in the duovalve were broken.
Picked up a used unit on ebay for £15 inc p&p...Problem cured..
 
television

television

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2002 SL500, 216 CL500, all fully loaded
AS billybob duo valve at fault
 
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Bolide

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BMW 525 Diesel Touring
There is one more possible reason: there's a sensor in the map light assembly with a rubber tube that goes down the A pillar to a fan behind the dash. If the sensor's unplugged, or the rubber tube disconnected, or the fan stops working, the heater tends to go full hot

But 99% of the time it's the Duovalve...

Nick Froome
www.w124.co.uk
 
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230ceBruno

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  • Thread Starter
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  • #5
Thanks guys it turns out it was a fuse now who can tell me what damage to expect as I drove the car on 6 separate occasions and the temp reading crept may 10, 15 degs away from 120 on 3 instances when I stopped at in traffic.
 
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