I come from a tropical country(Singapore) Recently, I've noticed an increase of the average water temperature of my car(higher than usual 88-99 degrees C). Fearing for the worst, I changed the radiator, thermostat and coolant. The situation got better after changing.(85-87 degrees C while car is in motion) But when the car is not moving(e.g stationary at a traffice light junction) the water temperature increases to around 97 degrees C. After which it will take quite a while (around 3-4 minutes) before the temperature starts to drop. It seems that the cooling system is not as responsive as before. I've checked the engine fan, auxilliary fan and fan belt as well, they are all working. What could be causing this???

Car:MB E200 W124
Yr: 1994

Repair History:
Heater Control Valve was not working.Hot air came out of the 2 outer a/c consoles in the passenger cabin. Went to MB Service Centre. Technician told me that they will block the passage of hot air flow into the passenger console.(Because it is more expensive to replace the heater valve)(Heater control valve not replaced)

Catalytic Converter changed due to noise coming from exhaust during sudden acceleration.

Just a guess...I would look at how the heater is blocked off. If the return flow from the cylinder head to the water pump is blocked, it could cause a problem.
Regards,
Randy D.

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W.R.Durrance
ASE Master Tech
Mercedes Tech 20 Years
68 250SE
68 SAAB 96 Ice Racer
69 300SEL 6.3
70 300SEL 3.5
81 300TDT

Thanks for your reply, but I think the technician blocked the path connecting the heater outlet to the a/c console. Any other possible causes??

80s to < 100C is perfectly normal and is fabulous for your country. Ensure that you put a 50-50 mix of coolant/water in the radiator.

Your car sounds OK to me.

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'89 420 SEL
'90 300 SEL
'68 Olds 88 Convertible
'84 300 SD (sold it)

This was also what the Technician at the MB Service Centre told me. However, the temperature of my car used to range from about 81 to 88 degrees C, be it in motion or idling. Could the increase in temperature be due to the age of my car??? Thanks any reply is greatly appreciated.

"more expensive to replace the heater valve"

:confused:

?????

The heater control valve in my 92 190E 2.6 cost $12 (US). And took about 20 minutes to replace.

Also, normal temp range is 82-107 celcius. Electric fan doesn't kick on until 107.

(Correct me if I'm wrong)

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'92' 190E 2.6
'89' Dakota Shelby
'96' Chrysler Sebring

Hmmmmm.....this sounds strange, the technician at the MB Service centre told me the bill to change the valve would amount up to nearly S$500.......no idea....