300TE Running hot, sound like radiator? - PeachParts Mercedes-Benz Forum

ps2cho · #1 06-17-2011, 10:49 PM

Quote:

Originally Posted by sptt

ps2cho...It's an MB waterpump and looks good. Should there be some noticeable pressure in that top hose? Is there a way to check? I replaced the T-Stat today with a new Mercedes Benz one. Did nothing. Napa and MB Deler also told me you could not get a 79c T-Stat for these cars. Frustrating

Looks does not mean it is good. Like I said before, higher the pressure in that top hose, the higher the suction. The propeller inside could be worn out.

The service guy you went to is a moron. Part #100-200-07-15

sptt · #2 06-18-2011, 12:19 AM

I think you are correct. The coolant is probably not circulating fast enough. When I turn on the heater, temp drops immediately. I should have been a mechanic. I have the other waterpump still so I'll change it out as soon as I get a chance. That really ercks me!

Thanks

Ferdman · #3 06-18-2011, 03:25 AM

sptt, the engine in your 1988 300TE is designed for an 87 degree C thermostat. Presuming all the cooling system components are functioning properly the 87 degree C thermostat will allow maximum engine efficiency.

I agree with ps2cho. The appearance of the water pump is irrelevant. The condition of the internal components is critical. If the impeller is shot then the water pump is not providing adequate coolant flow through the cooling system to maintain the 87 degree C operating temperature.