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-   -   I'm at my wits end.. Overheating '94 E320 (http://www.peachparts.com/shopforum/tech-help/227821-im-my-wits-end-overheating-94-e320.html)

High-Test 07-16-2008 05:38 PM

1994 E320 shouldn't have hit 140C today...
 
I am at my wits end with this car. Two weeks ago, my car was massively overheating. I had poured two bottles of coolant in 28 hours, and the car sprayed all of it all over the road. It was running at 115-120 degrees. So, I took it in and my mechanic said the fan clutch broke. So.. three hundred fifty-eight dollars later, I get my car back.

Now, It's July 16. It was 96 degrees fahrenheit outside. I drove about twelve miles in stop and go traffic. The car hit 110, and instead of leveling out and going down, it continued to go up. it hit 120, and then went into the stratosphere at 135 or 140.

I stopped at my house, and opened the hood to look at what was going on. the electric fans werent turning. I turned the car off, and the main fan freewheeled for a second and then stopped, but the car made the telltale signs of the fan clutch working properly every time the car passed 100. Does the fan clutch just break at high temperature?

For most of the day, the car ran in the nineties and around 100. Then.. this.

What is wrong with my vehicle? Do I need to flush coolant? new auxiliary fans?

:confused::mad:


Thanks,
Chris:confused:

nissanzx1 07-16-2008 07:10 PM

Do the cheap, easy stuff first... Coolant flush (Zerez GP05) no green stuff, and a new thermostat if you can't remember when yours was last changed...

Check all the fittings and hoses to make sure they are tight. Make sure to purge the system of air...

You could have radiator blockage due to a current or past head gasket leak. A new radiator for your car is an easy do-it-yourself project.

Your fans should be coming on, try a search on this forum for the aux fans and you'll find lots of information on how to troubleshoot them...

Sounds like there may be more than just 1 factor causing the overheating situation with your car...

-GH

Arthur Dalton 07-16-2008 07:12 PM

First check is aux fan.

Test # 1:
Turn key ON, pull the connector off the blue/2 wire sensor at thermo housing.

Does Fan come ON high??

If no, then check fuse on top of fan relay [ behind fuse panel]

Martin Wolf 07-16-2008 08:26 PM

Listen to the man, Arthur will take you down the trouble shooting path, and things will be all right.

We are so fortunate to have the exchange of knowledge on this forum, you have no idea how much grief this can save you. Read, learn and absorb, its a great lesson on life.

Martin Wolf

crashone 07-16-2008 10:20 PM

If you do a coolant flush, open the block drain and get as much crud out as you can. There are some good posts on here about the different flushes to use. You could try pulling the thermostat and see if the car runs cooler or not. Good Luck.

High-Test 07-16-2008 11:31 PM

Indeed. the Arthur Dalton code reader is the best $15.69 I've ever spent on an automobile. :vbac47679

Alright, I pulled the connector with the two wires (red and blue) off and put it back on the blue side. Nothing. So, I pulled the green 30 amp fuse from the relay. it was broken. I put in a replacement. THe car ran cool, then jumped from 80 to 120 in two minutes. Then, it dropped from 120 to 100 suddenly and leveled off at 110. I looked to see if the aux fans were running, they weren't. I drove around to get it up to 120 again to see if it would repeat its little trick. It didn't. after a while, it got up to 120 and stayed. Lucky for me that home was less than a mile away. The car wasn't making that "roar" at 100 when the fan clutch is supposed to come on either.. I just had that fixed.

Could that connector be on backwards? Could it be as simple as corrosion on the red aux fan fuse?


And it is still boiling out coolant.

I have some radiator cleaner stuff. I'll run by the MB dealer and buy a new radiator cap and some MB coolant and hopefully flush it tomorrow.

:disappointed:

This is my only car. Being carless is a big drag for me... I'm 19 and in college. I got this car on the premise of its legendary reliability. So far I've replaced a wiper motor, outer tie rods, plugs and wires, and a fan clutch. It's starting to sound like the other three vehicles I've owned. And that makes me sad. This one is by far my favorite.

Arthur Dalton 07-16-2008 11:36 PM

<Alright, I pulled the connector with the two wires (red and blue) off and put it back on the blue side. Nothing. So, I pulled the green 30 amp fuse from the relay. it was broken. I put in a replacement. THe car ran cool, >

What does that mean???
Put it on the blu SIDE ?? what is that???

And did the fan run after the fuse replacement??

How about some info back to me ...like

Do you have aux fan now ...YES or NO ..

High-Test 07-16-2008 11:48 PM

I connected the red side of the red/blue connector. (That's the way I interpreted the instructions)

I had NO fan with it unplugged completely.

I replaced the green 30 amp fuse - NO fan afterwards.

Arthur Dalton 07-16-2008 11:52 PM

OK

You are not on the same page , so I will tone it down..

You see this part??

http://catalog.worldpac.com/mercedesshop/sophio/wizard.jsp?partner=mercedesshop&clientid=catalog.mercedesshop&baseurl=http://catalog.peachparts.com/&cookieid=2EI1B4MYE2F21F3QIA&year=1994&make=MB&model=E-320-001&category=R&part=A%2FC+ACC+Temp+Sensor

High-Test 07-16-2008 11:54 PM

Yes.

that's the one from which I unplugged the connector

Arthur Dalton 07-16-2008 11:56 PM

OK

Key ON , unplugged sesnor , and no aux fan...correct?

If yes..then go look again at that 30 A fuse on top of the green relay..see if it blew again.

High-Test 07-16-2008 11:58 PM

Ok. I will do that.

Even though I may be really slow, I do appreciate your help.

Arthur Dalton 07-17-2008 12:01 AM

Don't worry..we just slow it down for ya...

That is why I show pictures of the parts...I hate typing.

High-Test 07-17-2008 12:16 AM

Thank you.

I have tried again, key ON, aforementioned connector unplugged. NO fan.

The 30 amp fuse has blown.

Arthur Dalton 07-17-2008 12:24 AM

OK

Spin each fan by hand from the hub of the fans..see if they both turn equally free ..they should spin freely...if YES, continue on ..if NO, we have a bad fan motor [ drawing excess amps due to binding bearings and blowing the fuse]

Look for this part behind the drivers side headlamp area

http://catalog.worldpac.com/mercedesshop/sophio/image.jsp?title=Aux.%20Fan%20Resistor&url=http%3A//img.eautopartscatalog.com/live/G504051927BER.JPG

see if there are any burnt wires/connectorsa on these terminal.


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