Car overheating - Mercedes-Benz Forum
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#1 (permalink) Old 07-11-2013, 08:01 PM
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Car overheating

I've looked up this question on this site but the thing is I'm a complete newbie when it comes to stuff about cars. Anyways my 1990 Mercedes Benz 300e has had this problem for a long time now probably a little under a year. The temperature of the car will be fine until I drive for at least 15 minutes and even then it's okay but once I hit traffic or a stop thats when the temperature starts to rise; I have to turn the heater on and rev the engine while on neutral or park which helps the temperature go down a little bit. If the temperature has been hot for long enough it will throw out all the coolant and sometimes there will be a loud noise sounds like alot of pressure trying to escape and it almost sounds like it's going to blow up as it gets very loud. Here are some pictures if it helps any, and the car also has a check engine light on which may be related to the problem?
Also the arrows show that there is something missing and if it's important? the car has been doing this before these parts fell off and its been running the same.
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Last edited by geralriver; 07-11-2013 at 08:05 PM.
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#2 (permalink) Old 07-11-2013, 08:03 PM
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i took the cap off the first picture but the first picture with the arrows was to show that i have seen the water leak out through there
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#3 (permalink) Old 07-11-2013, 08:06 PM
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Dude, is that your washer fluid tank?
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#4 (permalink) Old 07-11-2013, 08:08 PM
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Originally Posted by MichaelBenz300e View Post
Dude, is that your washer fluid tank?
yep
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#5 (permalink) Old 07-11-2013, 08:22 PM
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Leaking windshield washer coil. Very common.
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#6 (permalink) Old 07-11-2013, 08:44 PM
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Leaking windshield washer coil. Very common.
thank you for that
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#7 (permalink) Old 07-11-2013, 08:58 PM
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Be sure to replace that coil ASAP and get the o-rings where the coil goes into the tank..
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#8 (permalink) Old 07-12-2013, 11:47 AM
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These are very simple things. If you can not figure these out than you are in need of a mechanic.

2) Overflow hose

3) Breather hose


Find a mechanic.



Quote:
Originally Posted by geralriver View Post
I've looked up this question on this site but the thing is I'm a complete newbie when it comes to stuff about cars. Anyways my 1990 Mercedes Benz 300e has had this problem for a long time now probably a little under a year. The temperature of the car will be fine until I drive for at least 15 minutes and even then it's okay but once I hit traffic or a stop thats when the temperature starts to rise; I have to turn the heater on and rev the engine while on neutral or park which helps the temperature go down a little bit. If the temperature has been hot for long enough it will throw out all the coolant and sometimes there will be a loud noise sounds like alot of pressure trying to escape and it almost sounds like it's going to blow up as it gets very loud. Here are some pictures if it helps any, and the car also has a check engine light on which may be related to the problem?
Also the arrows show that there is something missing and if it's important? the car has been doing this before these parts fell off and its been running the same.

Bruce
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#9 (permalink) Old 07-12-2013, 02:55 PM
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O.K. - to get back to your overheating issue. Is your electric fan working? As far as the windshield washer fluid issue, most time people just by-pass the coil that goes to the windsheild washer fluid when it goes bad. I believe the problem with the coil in the washer fluid is more of a result of overheating and not the reason, but I could be wrong. The by-pass should eliminate that concern for you to let you look for what could be causing the over-heating. Also, is the thermostat O.K.? They are easy to check - remove it and but in a pot of boiling water and it should open fully. Last item I can think of is the viscous mechanical fan, however if that isn't working right, you should still have enough cooling with the electric fan (unless you are running A/C in a very hot climate). I know on my M104 if I pull the two wire connector on the thermostat housing my electric fans (M104 has 2) turn-on, but I'm not sure that true for your model. There is also a couple of relays that control the fans that have fuses that may be suspect if your fan isn't working. Good Luck!
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#10 (permalink) Old 07-12-2013, 04:34 PM
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Quote:
Originally Posted by benzitch View Post
These are very simple things. If you can not figure these out than you are in need of a mechanic.


Find a mechanic.
Don't.
You are here to learn and it's great resouce site.

As long as you are willing to learn, you will learn anything. Don't be discouraged by naysayers.....

I and many people like me are regular visitors here who never in their life touched wrench and Now doing lot of regular and advance maintenance themselves.

'93 300E 2.8, Green (199K...)
'89 420SEL, Diamond Blue (154K..)
'07 Santa Fe SE, Natural khaki (80K..)
'08 kawi 250R, Red (10K..)
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