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2010 GLK350 M272 - Radiator Fan on Full Blast, No A/C, Engine Temp. Ok

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2010 GLK350 M272 - Radiator Fan on Full Blast, No A/C, Engine Temp. Ok

 
Old 05-17-2019, 03:16 PM
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2010 GLK350 M272 - Radiator Fan on Full Blast, No A/C, Engine Temp. Ok

What could be the cause of this? It is likely the lack of A/C is related to the radiator fan operating on full constantly (probably a fail-safe feature for the A/C system).


Fan started operating on full blast after coolant was added to the system and cap was no tightening letting air into the system.
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Old 05-17-2019, 05:43 PM
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you have a faulty fan controller.
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Old 05-18-2019, 11:04 AM
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Originally Posted by Plutoe View Post
you have a faulty fan controller.
Seems to be a faulty condenser pressure sensor.
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Old 05-21-2019, 01:42 AM
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If you added coolant and forgot to tighten the cap.... most likely it boiled out and air got in the system. You need to bleed the system and erase the codes in engine control module. You will have a code for coolant temp sensor malfunction. If not, then your ECU might be the problem. But proper diagnostics will be required.
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Old 05-21-2019, 06:22 PM
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Originally Posted by MBENZTECH View Post
If you added coolant and forgot to tighten the cap.... most likely it boiled out and air got in the system. You need to bleed the system and erase the codes in engine control module. You will have a code for coolant temp sensor malfunction. If not, then your ECU might be the problem. But proper diagnostics will be required.
Thank you for this. Do you know if air in the system would cut off the A/C also?

Last edited by LandSeaAir; 05-21-2019 at 06:46 PM.
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