Operating temperature too high ?

[lenosb]

My father in law has a E220 (1995 model). The vehicle used to operate at 80C until the water pump started leaking. Since replacing the pump the temperature peaks at 92C+.Subsequently he replaced the thermostat as well which has made no difference. When driving in traffic the temp fluctuates rapidly. We were told this is normal but I am not convinced, as the previous temperature was much lower than this and stable.We've had the pump rechecked but it seems to be working fine. Please help me establish what the correct specified operating temperature is and why his vehicle ran at a lower temp before replacing the pump?

Thanks from sunny South Africa.....

 

[Silver Arrow]

A poor contact will cause a high reading. I have an IR laser thermometer which I use to check the temperatures around the engine and radiator if I suspect cooling difficulties.
First check using one of these to see if it is a cooling problem or an instrumentation fault.
(How did you measure the precise values of 80 and 92?)

 

[television]

My father in law has a E220 (1995 model). The vehicle used to operate at 80C until the water pump started leaking. Since replacing the pump the temperature peaks at 92C+.Subsequently he replaced the thermostat as well which has made no difference. When driving in traffic the temp fluctuates rapidly. We were told this is normal but I am not convinced, as the previous temperature was much lower than this and stable.We've had the pump rechecked but it seems to be working fine. Please help me establish what the correct specified operating temperature is and why his vehicle ran at a lower temp before replacing the pump?

Thanks from sunny South Africa.....

Could be transmitter faulty, cheap to buy and replace, I f you check temp as Silver arrow says it will be the transmitter.

Malcolm

 

[lenosb]

Thanks guys I'll pass the info on and let you know...

 

[malcolm E53 AMG]

I had similar problem with a 300TE temp readout. This occurred after I had replaced the radiator, the system then indicated that it was running hotter. This didn't bother me too much as I knew the system was operating OK. The coolant flow throught the new rad was obviously not as good as the original and causing a slightly higher readout (conclusion, the sender is obviously very sensitive).

Ironically, everthing returned to normal after yet another replacement rad was required. It may be worth flushing the rad to make sure the flow rate is OK.

Hope this helps!

 

[Stevie A]

If the system was filled with more antifreeze (eg 55% anitfreeze 45% water) when the pump was changed then this would mean this system may run a bit warmer. I changed antifreeze and the temp went from 80 normal to about 84 ish. Maybe this is cause. 92 sounds a a good bit warmer though.

 

[television]

If the system was filled with more antifreeze (eg 55% anitfreeze 45% water) when the pump was changed then this would mean this system may run a bit warmer. I changed antifreeze and the temp went from 80 normal to about 84 ish. Maybe this is cause. 92 sounds a a good bit warmer though.

its not too much really, electric fans turn on at 100

Malcolm

 

[Stevie A]

I agree Malcolm - 92 is not that high.

 

[lenosb]

Hi Guys,

Thanks for taking an interest in this topic. What I need to point out is that my father-in-law is concerned about is the fact that his vehicle USED to operate at around 80C but since changing the water pump is now running in the nineties. I agree that 92C is not that high but the problem is that is was running at about 80C and he needs to establish why there is a +-10C difference since the pump change...once again thanks again for all your input and opinions.

 

[television]

A different pump, maybe modified impeller could be the reason, many mercs run too cool anyway, and you are now spot on.

Malcolm

 

[lenosb]

A different pump, maybe modified impeller could be the reason, many mercs run too cool anyway, and you are now spot on.

Malcolm

Yeah..now that sounds very plausable especially since the original pump is what, about 10 years old ?

 

[elton]

--------------------------------------------------------------------------------

Hi,
Does anyone know what the spring connected to the idle value under the bonnet is called. Mine has snapped and the car cannot tick over.

C180 elegance 1995

Regards
Elton

 

[PaulMe]

E220 too cool

I have an E220 but it seems to be running too cold. I took the thermostat out (2 broken bolts later **%&££) and it seemed to start to open at around 80 (tested in a pot on the hob with a thermometer). However, the heating never seems to get genuinely hot and the temp gauge shows no more than 60. Car has been converted to LPG though that should not affect the cooling, should it?

 

[tom7035]

--------------------------------------------------------------------------------

Hi,
Does anyone know what the spring connected to the idle value under the bonnet is called. Mine has snapped and the car cannot tick over.

C180 elegance 1995

Regards
Elton

Idle valve spring perhaps?

 

[television]

--------------------------------------------------------------------------------

Hi,
Does anyone know what the spring connected to the idle value under the bonnet is called. Mine has snapped and the car cannot tick over.

C180 elegance 1995

Regards
Elton

Throtle return spring------Next

Malcolm

 

[clive williams]

A different pump, maybe modified impeller could be the reason, many mercs run too cool anyway, and you are now spot on.

Malcolm

Malcolm may have a point here. The car was presumably for the SA market and would have been fitted with a high capacity cooling system. As its more than 10 years old the suppliers are probably rationalising the spares and providing European spec models only for all markets. High capacity impellers were always a feature of hot climate specifications.
Another thought. To fit the pump was the rad taken out? Was it then flushed before it was put back? Emptying and disturbing the rad could have disturbed the inner crud causing a blockage.

Clive

500E
E320CDIT210

 

[television]

Malcolm may have a point here. The car was presumably for the SA market and would have been fitted with a high capacity cooling system. As its more than 10 years old the suppliers are probably rationalising the spares and providing European spec models only for all markets. High capacity impellers were always a feature of hot climate specifications.
Another thought. To fit the pump was the rad taken out? Was it then flushed before it was put back? Emptying and disturbing the rad could have disturbed the inner crud causing a blockage.

Clive

500E
E320CDIT210

Funny Clive in this modern age one forgets about flushing, good point worth a try, and low cost,dont forget new anti freeze.

Malcolm