1986 190e 16v: overheating - Mercedes-Benz Forum

 
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post #1 of 10 (permalink) Old 04-05-2005, 05:52 AM Thread Starter
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1986 190e 16v: overheating

Recently my 16v started overheating. Checked antifreeze level and 50/50 ratio of antifreeze to water. Question is when does the fan engage to cool the engine? While the auto in running, I've noticed the fan rotates but at a very very slow speed. Stranded on the freeway with boil over.
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post #2 of 10 (permalink) Old 04-05-2005, 10:47 AM
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RE: 1986 190e 16v: overheating

Hi jduran,

At road speed, say 15 mph up, the fan doesn't really do much (if anything) for cooling. Just the movement of the car through the air creates the airflow across the radiator.

If the engine temp. is OK at low speeds, then rises to what you have described only at highway speed, I'd suspect perhaps the radiator itself (especially if original) is either partially clogged and cannot dissipate the heat into the atmosphere, or possibly the radiator fins are partially eroded away due to road salt/rain water.... same result.

Have you had the car tested for CO in the cooling system. Today a good shop can introduce a chemical into the coolant which will change color if combustion gasses are present. Head gasket, cracked head....

If your car was in stop and go traffic (I see the word 'freeway'.) when the car overheated, the fan operation would be the logical bet. I don't know what temp. it would activate on your car.

Now that the car has really overheated, were I in your shoes, I think I'd have the coolant tested for combustion gasses.

Good Luck, MBL
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post #3 of 10 (permalink) Old 04-05-2005, 09:37 PM
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RE: 1986 190e 16v: overheating

Maybe check your thermostat ?
It might not be opening ?
Good luck, Spiros
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post #4 of 10 (permalink) Old 04-06-2005, 06:32 AM Thread Starter
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RE: 1986 190e 16v: overheating

Thanks for the info. While I was on the freeway, traffic slowed to a stop and go. While creeping along at approx 5 miles per hour, I noticed the temp indicator pushing toward the red line. After I pulled over to the side of the freeway, antifreeze started gushing out of the overflow tank. I thought the radiator fan was to kick in before temp reached the red line. In January 2005, I replaced the radiator.
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post #5 of 10 (permalink) Old 04-06-2005, 07:55 AM
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RE: 1986 190e 16v: overheating

I had this similar problem 3yrs. ago!
You have to get the thermostat checked. It might not be opening(seized)! This is about a $20-$50 fix!
Good luck
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post #6 of 10 (permalink) Old 04-06-2005, 07:55 AM
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RE: 1986 190e 16v: overheating

You might also want to check the hose coming from the reservoir. It happened to my lexus before. Over the time, stuff was stucked in there and water couldn't make thru.
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post #7 of 10 (permalink) Old 04-06-2005, 08:00 AM
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RE: 1986 190e 16v: overheating

The thermostats in these 16v 190's play a very important role. If i'ts not opening properly, your engine will overheat! You don't want that, because you will cause excessive damage to your motor !
Spiros
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post #8 of 10 (permalink) Old 04-07-2005, 01:53 PM Thread Starter
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RE: 1986 190e 16v: overheating

i changed out the thermostat with a new 87 deg centigrade thermostat. While traveling on the road speed approx 20 mpr, temp was ok. When I stopped for a red light, temp started edging up to the red line. Fan never engaged to cool the engine down. Waiting on the side of the road again.
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post #9 of 10 (permalink) Old 04-07-2005, 02:55 PM
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RE: 1986 190e 16v: overheating

Hi jduran,

Sounds like the fan sensor or a relay, perhaps even a simple fuse (?) is causing the fan not to work. If you 'hotwire' the fan motor, will it work?

I think we all agree the thermostat is important. That said, in my experience, a sticking thermostat (nearly always) sticks closed from dead cold causing the engine temp to rise & keep going up, then if it opens , the temp will transition quickly from abnormally hot to normal.

There isn't really any way for an engine thermostat to close wile immersed in coolant at normal operating temperature.

See http://auto.howstuffworks.com/cooling-system8.htm for a good description of the T/stat. operation.

Regards, MBL
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post #10 of 10 (permalink) Old 04-08-2005, 07:58 AM
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RE: 1986 190e 16v: overheating

Hi jduran,

I came upon this tech article which covers, in some detail, both the theory of operation regarding the MB electric cooling fan(s), and how to adjust the circuits so the fan comes on at a lower temperature.

http://pages.prodigy.net/jforgione/MB_CTS.html

Though the article centers on '92-'95 S class cars, the theory & mods. are applicable to many other models, including the 190E.

I'm sure this will help diagnosis of your fan circuits & allow you to further tweek the settings, should you be so inclined.

Cheers, MBL
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