Today in Phoenix, AZ it is to be 118F (47.7c). My 2008 S class does just fine but my 1988 SL has one of the weakest AC systems I have ever had in a car. While the '88 is a tank it just lives in the garage during the summer (kind of like those where it snows putting their cars up for the winter).
Michael in Arizona
Hi there Michael.
Those SL's are cool. Is it R129 or R107? Both are nice but I personally prefer the R129 for its slicker looks. A tank indeed.
For some reason people often have bad luck with A/C's on these. Even updating it often gives results not worth it.
IMHO by 98 Mercedes had lost its way and was not putting out very good cars.
Agreed; for the S class.
As for the E class, I nominate 95 YM the last very good car made by Mercedes. Those w210's remind me with some old owefull looking Toyota, don't remember the name, body design but in a bigger size.
My 2002 SLK handles the Vegas heat well!
Hello there Galaxys.
Ever since MB replaced the engine fan with an electrical, dealing with heat improved a lot. Not because electrical fans cool better, but because they are easier to diagnose and fix (where I live at least) + other improvements in the cooling system as a whole.
The most MB's with cooling and A/C problems are the ones before '98. Having those handling heat well is something to really appreciate.
Diesels convert up to 50% of fuel energy into HP, while the other 50% is transferred into heat mostly.
Gasser convert about 33% of fuel energy into HP while over 60% is converted into heat. So technically gasoline engines are heaters and HP is by-product
My thermostat is set at 87C, so on the picture it runs a tad higher than in cooler temperatures, but that might be due the fact the picture was taken short time after city and parking driving, where temp went above 90C (again - with main engine fan removed)
Lower thermostat gives you some short-burst cooling capacity for momentary situation like entering the freeway, or steep grade, but once you hit 7 or 12 miles grade, like I have on my routes, the burst ends at 1/4 of climb. Than the low setting thermostats keep your engine bellow recommended temperatures, costing more engine wear and more fuel to burn on colder days.
I use 50-50 mixture of MB coolants in my vehicles and don't worry if it is few % more or less. For the car I put a gallon of coolant and top off with distillate water.
For truck with 5 gallons capacity, I put 2 gallons of coolant and rest d water.
Zerex got MB approval for use in our cars, but almost each instance when members makes a topic about overheating, turns out he drives on Zerex or worse. Makes you thinking how much you want to risk for 5 or 8 dollars savings.
The MB gauges are real and the latest I drove was 2005 model. I hope MB will not follow the trend as I was having really hard time when my Ford alternator stop working and dash voltmeter was still showing over 13V
It is sad that diesels produce more percentage of power yet diesel engines are so much underpowered than gas engines. Except with turbo diesels and similar. It is also nice to have both fuels cheap where I live
Actually, the data sheet of the cooling system for engine M103 says that the actual opening point for the 87C rated thermostat is 85-89C. This means, if my analysis is correct, that at some point it will open at 85C which is what we can see on your pic. On cold times my gauge reads right about what seems to be 85C for a long time on highways before it goes higher later on at lower speeds. Here is an old pic (yep, even here it gets this cold sometimes):
The main reason I ditched the 65C t-stat was because of the side effects of getting colder than the recommended engine temp. Not to forget about warming up faster to get the performance and economy the engine was designed for ASAP.
Thank you for the info about coolants. Now I can safely unify some parts on both my cars.
Same thought about true gauges. But, I'm shocked to know that Ford uses dummy gauges for battery recharging as well!!! What else is there? Dummy fuel level gauges?
Actually the 1996-97 models of W210 who were grandfathered by drivetrains from W124 are the one costing most of the problems.
For the E class, I humbly believe that W124's were the last real MB's made.
Generally speaking, first MY of any new generation has the most problems, but with good older MB's, those problems were less because assembly and quality check were on top of the list back then. May I resurrect the term "over engineering"?
Not sure but, I don't think w210's were over engineered.