News:

www.W116.org - All about the Car!

Main Menu

Hot Climate Operating Temp

Started by Mr Sherrers, 05 July 2023, 02:35 PM

Mr Sherrers

Hello folks, newbie here. No matter where I look I cannot get a firm answer. Yes I've searched and seeen the other topics about operating temp but they sort of confirm what I suspect without actual finality.

My W116 450 SEL from 1973 definitely should run at 80 degrees. Which totally makes sense in Stuttgart.

In Ibiza we regularly get atmospheric temps of 35 to even 40 lately. Even in 'winter' it is rarely cold.

I'm getting a solid 90 all year round on the gauge, it can drop to 85 when I get some speed going but crawling in city traffic the needle can nudge 95.

Am I needlessly stressing? Is it a myth about heat bandages on the manifold? The thermostat seems fine and she's had new oil and coolant regularly.

I guess the main question is - do you own one in a hot country? And if so can you get it to 80 degrees where you are? I'm thinking next stage is radiator flush etc

Thanks folks, been a lurker for a few years now.  ;)

daantjie

80 is too cool in my opinion.   I guess you have DJET seeing as this is a 73 model, but on later models 87C thermostat is what is specced.

I always tell folks to focus on what the needle is doing rather than be focussed on absolute temp readings.

What I mean is for example if it's hot out and you climb a hill it's perfectly normal for the needle to approach the red.  Then does it come down when the climb is over and speed and grade reduce?  If so then good.

It cannot hurt to check the radiator but I would also pull the thermostat and see what temp is stamped on there.  I would bet it's likely 87C.
Daniel
1977 450 SEL 6.9 - Astralsilber

Mr Sherrers

That's very helpful thanks I will look for sure.  ;D

daantjie

Might not be a bad idea to replace the thermostat regardless, especially if it's original to the car.  If it's not fully open at operating temperature then that's of course no good.

I'm sure other members will chime in too. I see part number 1162000215 which is the 84C one then there's also 1102000515 which is 87C.
Daniel
1977 450 SEL 6.9 - Astralsilber

Mr Sherrers

I will do that, many thanks.

Mr Sherrers

The heat has also led to a killer patina that I came to really love. I was asking around about paint shops keeping it with just a clear coat over the top but there aren't many here and none of them seem to grasp why anyone would want to.  ;D


ptashek

#6
Quote from: daantjie on 05 July 2023, 03:55 PMI'm sure other members will chime in too. I see part number 1162000215 which is the 84C one then there's also 1102000515 which is 87C.

From Xentry:

A1162000015 is 75*C
A1162000215 is 84*C
A1102000515 is 87*C

1993 "Pearl Blue" W124 280TE
1988 "Arctic White" W124 200T
1979 "Icon Gold" W116 450SE

Mr Sherrers

much obliged, I learned something here.

UTn_boy

I've never seen or owned a 4.5 or 3..5 that didn't approach 100 degrees C while sitting in traffic on a hot day with the air conditioning on, or 90-95 degrees without air conditioning.  Bear in mind that the cars I had were treated to new/rebuilt engines, cooling systems.  Just stay away from aftermarket thermostats and water pumps.  Both have tendency to be calibrated incorrectly, and the aftermarket water pumps usually have the impeller placed in the wrong position, which will either inhibit coolant flow or decrease it.  Though, for your climate, a thermostat that opens sooner would be ideal.  Remember that the other thermostats only open at a lower temperature, but they all open the same distance.  So you may still experience what you are currently seeing.  And remember, as long as it's not in the red on the temperature gauge, no worries.  Here in the U.S. when these cars were new, (both the W108/W109 and W116 with the 3.5 and 4.5 engines) people were constantly taking their cars back to the dealership because the temperature gauge went up to 100C on a hot day.  It was funny to see or hear their reactions when they were told it was normal.  Some people accepted it, some argued, and many got rid of their new Mercedes because of this.  It was a s*%t show in the early 1970's. 
1966 250se coupe`,black/dark green leather
1970 600 midnight blue/parchment leather
1971 300sel 6.3,papyrus white/dark red leather
1975 450se, pine green metallic/green leather
1973 300sel 4.5,silver blue metallic/blue leather
1979 450sel 516 red/bamboo

Nabstud

Not the same motor but my 280 temp gauge is like a yoyo. We get similar temps to you here in Australia. During winter it barely gets over the 80° mark (82° thermostat). In summer it goes up and down depending on whether you are idling, going up a hill etc etc. Often it gets to the 3/4 mark (sometimes a bit over) when idling in summer or going up a long gradient. Normally sits around 85-90° in regular driving.
I cleaned/rodded the radiator, new water pump, different thermostat, new fan hub etc but it didn't make much difference. It never shows signs of overheating (engine "pinging", hot coolant smells, coolant overflowing etc) so that is just how it is. I double checked the temp gauge with an infrared therm gun and it is pretty accurate.
It is nothing like newer car where the temp gauge stays steady until there is something really wrong!!!
1975 280S - Australian delivered

Mr Sherrers

Thanks to everyone, you have all really given me some peace of mind. I actually don't drive it much for fear of overheating so I will stop stressing and enjoy it!   :)

Mr Sherrers

Quote from: UTn_boy on 06 July 2023, 01:06 PMI've never seen or owned a 4.5 or 3..5 that didn't approach 100 degrees C while sitting in traffic on a hot day with the air conditioning on, or 90-95 degrees without air conditioning.  Bear in mind that the cars I had were treated to new/rebuilt engines, cooling systems.  Just stay away from aftermarket thermostats and water pumps.  Both have tendency to be calibrated incorrectly, and the aftermarket water pumps usually have the impeller placed in the wrong position, which will either inhibit coolant flow or decrease it.  Though, for your climate, a thermostat that opens sooner would be ideal.  Remember that the other thermostats only open at a lower temperature, but they all open the same distance.  So you may still experience what you are currently seeing.  And remember, as long as it's not in the red on the temperature gauge, no worries.  Here in the U.S. when these cars were new, (both the W108/W109 and W116 with the 3.5 and 4.5 engines) people were constantly taking their cars back to the dealership because the temperature gauge went up to 100C on a hot day.  It was funny to see or hear their reactions when they were told it was normal.  Some people accepted it, some argued, and many got rid of their new Mercedes because of this.  It was a s*%t show in the early 1970's. 

hahaha! fantastic.

I have to say it worried me too, enough to seek reassurance at least.

Sincere thanks.