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   W203 C Class
     W203 Info Sharing: Overheating experience
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Posted on: 2017/2/5 15:06
Just can't stay away
Joined: 2010/2/1
From: Kuala Lumpur
Posts: 149
Benz Model: W124 and W203
W203 Info Sharing: Overheating experience
G'day everyone,

Another sharing of experience for the W203 members here.

Went back to Johor for CNY holidays and all seemed well at first. My car behaved and I didn't notice anything strange.

Came back from JB and was stopped at the traffic lights. Suddenly temperature went up to the hi mark just before the 120 degree mark. The engine fan began spinning at high RPM to cool down the radiator and it was very noisy. Sounded like a fokker airplane propeller. It was loud. I went into panic mode.

Traffic lights changed to green and I moved my car forward to find a suitable place to stop my car. But as I started moving the temperature came down. So i proceeded to continue driving to my destination.

All this while the temperature behaved but it was not as low as it usually was. As i was moving the engine fan also slowed down and didn't make so much noise.

After reaching my destination i popped the hood and kept the engine running. When the car was stationary the engine temp started going up and the engine fan began spinning at high RPM blowing hard. I revved the engine and the temp came down and the fan slowed down.

I concluded that there was some issue with the coolant circulation flow. Could have been my water pump not functioning well or radiator clogged or etc.

Anyway, not much I could do but drive my car all the way back to KL in this condition. As I was travelling late at night there was not much cars on the road and the temperature remained low. I had no issues at all.

However the next day in KL during congestion i had to rev my engine a few times to bring down the high temp.

I sent my car to Benz Smart Car Care in Sunway and they began checking on the thermostat in my engine.

They tested it and found that the my thermostat did not open fully like it should. They actually had another thermostat to measure and compare how it should actually function and confirmed this.

So a new thermostat was replaced and now the engine temp is back to normal.

On talking to my mechanic and reading in the other forums about this overheating issue there were 5 main causes for overheating:

1. Blown engine gasket. (thousands to repair)
2. Thermostat. (RM250)
3. Faulty water pump. (RM300)
4. Faulty engine fan. (RM1600)
5. Clogged/faulty/leaking Radiator (RM1700 or more depending on brand)

Next time you face an overheating issue, check the cheap fixes first as sometimes mechanics may recommend expensive repairs which may not be the exact cause of overheating.

Cheers everyone


1990 W124 230E
2005 W203 C230K Avantgarde SE

Posted on: 2017/2/6 15:25
Home away from home
Joined: 2011/9/18
From: Kuala Lumpur
Posts: 157
Benz Model: W203
Re: W203 Info Sharing: Overheating experience
Thank you for sharing such experience and the remedy. It does take some efforts to diagnose and once the solution is found, it is priceless.
Posted on: 2017/2/11 1:55
Quite a regular
Joined: 2007/9/25
From: Shah Alam
Posts: 43
Benz Model: W203 Sport Edition
Re: W203 Info Sharing: Overheating experience
Thank you very much Sir, for sharing your priceless experience! Appreciate it so much!
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