C-Class (W202) 1995-2000: C 200 CDI, C 220 CDI, C 270 CDI, C 180, C 200 K,C 230 K, C 220, C230, C 280

W202 engine not reaching 80c on winter

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Old Jan 19, 2026 | 11:43 AM
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W202 estate c 220 cdi
W202 engine not reaching 80c on winter

As the title says it. I own this car for almost 3 years now and it's been a nightmare at winter time when the temps go below 0 the car never reaches operating temps it stays just above 40c and there is barely any heat inside even after a 30min drive on highway at 120-130kmh. I have already replaced the thermostat 3 times and its not that because i have also blocked the radiator with cardboard and nothing changes it just stays there the hose that goes to radiator is coold so the thermostat is doing the job. I was searching around and found that there should be a booster heater at the wheel arch but i do not see any hoses going there. Am i blind or what is going on? Any help is welcomed. The car is w202 estate c220 cdi production year 2000.
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Old Jan 19, 2026 | 04:10 PM
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From: Suburban Maryland
2023 E 450 Sedan. 2018 GLC 300. 2013 E 350 Coupe (retired)
Drive in a lower gear. Higher rpm equals more heat.
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Old Jan 20, 2026 | 10:22 AM
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bone stock E55 AMG
moved to W202 forum...
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Old Feb 1, 2026 | 12:32 AM
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2000 C280 112.920 engine 722.617 5 speed auto trans
I would suggest you try some of the AI sites with your question. They can be wrong but typically offer good suggestions and will ask
questions like a good diagnostician would. Try dialoging with one of them (or try several).
When I do that, the answers point mainly to thermostat or coolant temperature sensor. I read you've replaced the thermostat 3 times
but the symptoms of low gauge reading and little cabin heat generally points to a thermostat stuck open. Are you confident all air was
bled from the coolant system after replacing the thermostat? Using oem, mahle, behr, wahler thermostat?
I am not sure if this will apply to your thermostat, there is a procedure to test a thermostat described
at charm.li for the 2000 c280 (112 engine).
Mercedes Benz>>2000>>C 280 (202.029) V6-2.8L (112.920)>>Repair and Diagnosis>>Engine, Cooling and Exhaust>>Cooling System>>Thermostat>>Testing and Inspection
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