engine operating temp... - Page 3 - PeachParts Mercedes-Benz Forum

rrgrassi · #31 12-01-2006, 04:22 PM

Quote:

Originally Posted by justinperkins

Wouldn't you want to get the 80c tstat in there now so it doesn't take as long to warm up? I don't know about you, but I like my heater working as fast as possible when it's cold outside.

Well, considering I just bought this one, I would rather wait a bit and get one later. It was 21f outside this morning, and I already had heat in about 3 min idling. I just went fron no tstat to this one. I replaced it Sunday, and did not have the time to wait for delivery.

Stevo · #32 12-01-2006, 06:56 PM

Quote:

Originally Posted by Magoo

Mine runs at 100-105C (going by the OEM gauge) at idle and low speeds, and climbs to 110C at 65-70mph. I think that's a bit hot going by what i've been reading here, but have not confirmed accuracy of the gauge yet. I took the thermostat out yesterday to replace it and found it was 176F(80C)! However it's a made-in-China brand so I don't know if I trust it. Also I noticed the radiator has apparently contacted the fan at some point in the car's previous life, so there are some rather large flat areas. It has the 6 blade fan too...
Can anyone recommend an easy way to check the guage accuracy?

That is a tad too hot.

I check the temp gauges by getting a reading at the sensor (or T stat housing) with one of those little infa red remote gizmos. Its a cheepo from Costco but it seems too work. Old way.. if you can hold the upper radiator for more than a couple seconds, its not too hot. Wouldn't count on the accuracy of that one tho.

unkl300d · #33 12-01-2006, 07:14 PM

Well, with the old 80C stat, my car took about 10-15 minutes of running (city sreets) in San Francisco climate (say average is 60F) to get to 175 F (79.4C).
Likewise, on a hot day on the freeway it would run at around 212F (100C).

BUT now with the 92C stat, the engine temp rises faster to 175F and beyond. After much city driving it settles at around , what seems like 230F (110C).

My main concern is with the implications. I don't think it will overheat (50-50 mix coolant) but I wonder if it may affect the water pump or worse the head gasket. I also wonder whether it may cause engine oil to breakdown faster but this is academic because I change oil every 1500 miles on average.

So is head gasket something which may be affected by higher running temp??

I imagine that the Diesel engine itself can take high running temps and to some degree benefits from higher temps especiall because 90% of that car's use is city driving and short trips.

Comments??

unkl300d · #34 12-07-2006, 07:46 PM

Stevo, you are correct.

I had to buy an 80C thermostat from the dealer and bring it to the mechanic to replace. Now it is normal.
Although the old one was 80C, and was stuck a bit open, the mech insisted on the 92C one, blah blah blah.
Wrong!

Normally the guy is great but lately his screwed up family life has taken its toll.

Stevo · #35 12-07-2006, 08:02 PM

Quote:

Originally Posted by unkl300d

Stevo, you are correct.

I had to buy an 80C thermostat from the dealer and bring it to the mechanic to replace. Now it is normal.
Although the old one was 80C, and was stuck a bit open, the mech insisted on the 92C one, blah blah blah.
Wrong!

Normally the guy is great but lately his screwed up family life has taken its toll.

Sounds like a good time to get the manual and start twisting wrenchs

unkl300d · #36 12-07-2006, 08:54 PM

Yeah, I have the manuals and cds and wrenches. I do what I can on my own.

I brought it to him to figure out an alectrical drain which I had 99% tested out. (my lack of experience to get the final 1%)

He noticed the therm was not right.
He was correct on that but stubbornly installed a 92C therm even after I pointed out that it needed an 80C.

I do what I can on my own.
When I can !!