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MB Paul
MB Paul, Mercedes Technician
Category: Mercedes
Satisfied Customers: 3567
Experience:  Qualified Mercedes Benz Diagnostic Technician - 20+ years experience - Workshop Foreman for Mercedes
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2010 c250 blue efficiency coupe with no coolant circulation

Customer Question

2010 c250 blue efficiency coupe with no coolant circulation pump. no heat at idle. works fine under load. fault codes in me for control unit progamming or replacement. current and stored. no faults in acc/control module. thermostat replaced and vacuum bled with airlift bleeder. fault codes and actual values test with sds. software issue or known design flaw?
Submitted: 9 months ago.
Category: Mercedes
Expert:  Lou P. master tech replied 9 months ago.

Hello. Are you using a star diagnosis ? Did you mean that you don't have a coolant circulation pump or you have one and it's not working ? Also there is no design flaw or known issues so we will need to diagnose this.

Expert:  Lou P. master tech replied 9 months ago.

Also may I have your vin to check the option codes to make sure I look at the correct wiring diagram ?