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Old 03-04-2013, 04:09 PM
torontox5 torontox5 is offline
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Location: Toronto
Join Date: May 2011
Posts: 174
Mein Auto: 20005 BMW X5
Aux Coolant Pump

E53 2005 4.4i. Noticed heating was not effective as it used to be. After checking out I found out the Aux pump motor is not running to circulete coolant through the cabin heater.

The pump, wiring connectors seems good. I am getting the reference voltage of 5.2v at the connector from ECM. Ocationaly I get the battery voltage and the pump would run for a second or two.

It seems like a sftware issue. I am thinking of disconnecting battery for a time to reboot

I could not do any diagnostics with PA Soft 1.4.0. I could not get Inpa software running at all

Please advise. It is so cold in Canada at this time.
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