Heater Temp always High on re-starting? - BMW M5 Forum and M6 Forums

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Old 25th February 2015, 19:12   #1
rlich8
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Heater Temp always High on re-starting?

Hello all,

I have a very minor problem on my newly purchased E39 M5. Whenever I re-start the vehicle, the temp is always on the highest setting (89? I believe..). I adjust it to mid sixties (it's winter here) and drive around and it is then fine.

I once had an E46 325Ci that I did the final-stage resistor on, but I seem to remember that being more in relation to fan speed. Is that the possible culprit here on my E39 M5?

Please let me know

Thank you!
Royal
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Old 25th February 2015, 23:43   #2
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That's a bit odd - don't think its a known resistor issue.

Have tried disconnecting the battery for an hour to reset everything - some odd gremlins can be sorted this way.

Simon

Last edited by curtissp321; 25th February 2015 at 23:44.
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Old 26th February 2015, 00:15   #3
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That's not a sign of the FSU going bad. I would also recommend trying to disconnect the battery or pull the HVAC controls out and disconnect them.
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Old 26th February 2015, 00:42   #4
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This is something that the car can remember from driver preference via programming/the key. Mine resets to more modest 72 on restart.
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Old 26th February 2015, 00:53   #5
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OK Thank you griffincox.
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Old 26th February 2015, 01:31   #6
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If it has always done this that makes a lot of sense. I was under the impression that this was a new development. Resetting the key memories is pretty straight forward if you have the software.
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Old 26th February 2015, 15:13   #7
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My HVAC settings are always what they were when I shut down. Both temps, fan speed and ventilation choices.

Regards,
Jerry
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Old 26th February 2015, 18:15   #8
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I'm going to start with unplugging the battery overnight and seeing if that does it. I am not currently driving the car everyday because it is winter and the weather is terrible but I definitely want to fix this. Thanks guys.
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