Thermostat

Asked by GuruZPL41 Nov 19, 2017 at 08:50 PM about the 2007 Mercedes-Benz C-Class C 280 Luxury

Question type: Maintenance & Repair

My thermostat valved is jam and staying
open.code 0856-00.So says temp is rising to
slowly.Will it affect my engine if I drive it
before I get it replaced.??

1 Answer
101,595

KenF answered 6 years ago

No, gas mileage will suffer some. Until an engine hits operating temp the computer will stay in "open loop" mode, meaning it ignores certain sensor inputs. Since your thermostat is stuck open, it will just take engine longer to hit that temp.

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