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  #16  
Old 11-15-2006, 02:30 PM
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It doesn't seem normal that in 65 degree weather, driving around town, that the temp should reach 110 degrees and the aux fans come on. Am I wrong?

It is going to Enrique because the fans won't come on, but, it doesn't seem that the car should get hot enough to kick on those fans unless something is not working properly.

In the summer the car would stay between 100 and 110, day and night. The only thing that saved the engine from meltdown were the aux. fans.

We are talking about the same things.

Dcraig

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  #17  
Old 11-15-2006, 03:07 PM
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Just guessing here, but the aux. fans should be on at low speed nearly all the time, even at idle, and is what normally keeps your car in normal operating range.

If they are not on, then your car quickly goes up to higher temps, and then the high speed engages, which saves your engine from overheating.

I'm not saying your viscous fan is bad. Could be.

When I owned my 1993 W124 300E (3.2) "E320", I had the same overheating problem, took it to Enrique, and he showed me that the fans weren't engaging at low speed.

I thought it was my viscous fan, but he showed me that it was working, and explained that they rarely go bad.
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  #18  
Old 11-15-2006, 04:36 PM
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I don't think you have a fan problem. It's either a bad thermostat or a bad radiator/expansion tank cap.
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  #19  
Old 11-15-2006, 05:55 PM
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Quote:
Originally Posted by deanyel View Post
I don't think you have a fan problem. It's either a bad thermostat or a bad radiator/expansion tank cap.
but how do you explain the fact that his low speed aux fan is not on? They are on at low speed whenever the a/c is used, which is basically all the time. The HVAC system always has the a/c engaged, except when using the EC button.
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  #20  
Old 11-15-2006, 06:59 PM
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I have the EC on all the time, but rarely have the AC on. It needs to be re-charged, so I just keep it off. One of the things I need to get around to.

Now the AC fan has stopped working. There isn't a relay that works the AC fan and the aux. fans is there? The AC fan has been dying a slow death I think so I don't think they're related.

Dcraig
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  #21  
Old 11-15-2006, 07:05 PM
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Originally Posted by Dcraig View Post
I have the EC on all the time, but rarely have the AC on. It needs to be re-charged, so I just keep it off. One of the things I need to get around to.

Now the AC fan has stopped working. There isn't a relay that works the AC fan and the aux. fans is there? The AC fan has been dying a slow death I think so I don't think they're related.

Dcraig
I'm not an expert, but low a/c pressure could be your problem. When the refrigerant is too low, a switch prevents the compressor from running to prevent it from burning itself up. A/C pressure is also what tells the low speed fan to come on.

I think they're related.

But then again, I'm just an armchair mechanic.
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  #22  
Old 11-16-2006, 01:59 AM
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Dcraig, If you are concern about running a 100 and 110 you should purchase the resister from Jim. There is not a problem with your fans. It is normal for the e420 m119 V-8 engine to run at that temp. My e420 temp varies all the time. When I first purchase my e420 I had big concern about my temp running up to 110 I later learn that the MB design the vehicle to run at that temp. Jim has a solution to your high temp issue. If you want to run your fans and keep the temp lower then purchase the resister from him.

You can change your fluid, thermostat, hoses, fans' motors, relays and fan clutch it won't matter because the resister is what kick the fans on/off through the computer modules. Jim has your solution.
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  #23  
Old 11-16-2006, 02:03 AM
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Quote:
Originally Posted by Dcraig View Post
It doesn't seem normal that in 65 degree weather, driving around town, that the temp should reach 110 degrees and the aux fans come on. Am I wrong?
Dcraig
It is normal for E420 as long as the temp is not in the RED. It may get close but the fans will not allow it to exceed into the RED.
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  #24  
Old 11-16-2006, 10:15 AM
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But there's still something wrong with your car. It's November, even in SoCal you should not be running at 110, unless you're sitting idle in traffic. If the car is moving it's not going to normally get that hot. I've found that removing the belly pan helps but I still think you've got something else going on. I'm in Arizona, we're 10 degrees above normal (which is normal) and I'm running at 80 to 90 this time of year with no fans kicking on ever.
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  #25  
Old 11-16-2006, 12:43 PM
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Originally Posted by deanyel View Post
But there's still something wrong with your car.
Exactly.

I don't understand why everyone is ignoring the fact that his aux. fans are not running.

His aux. fans should be running nearly all the time, and they're not.
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  #26  
Old 11-16-2006, 06:25 PM
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i am having the same problem. it could be the temp sensor going bad. my gauge moves up and down. it even goes above 120C. i though the engine is toast, but it keeps running. then eventually goes down to middle. i am changing the sensor this weekend and see if that is the trouble... could be air in the system.
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  #27  
Old 11-16-2006, 07:24 PM
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I changed the cap yesterday evening. Then I drove to get dinner and though it was evening and cool, the temp didn't go higher than a tick above 80C. Really not far enough of a drive to see it it would climb higher.

Had it towed to Enrique this morning. I'm still waiting to hear.

Dcraig
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  #28  
Old 11-17-2006, 10:13 PM
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Enrique said the reason the fans didn't come on was because of a bad relay.

So, I have a new radiator, fan clutch and expansion tank cap. The water pump is fine. He's also hooked up some type of resistor that'll kick the fans on earlier. I can keep it on if I want or he'll take it off.

Dcraig
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  #29  
Old 11-18-2006, 09:45 AM
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My M119 runs around 80, until she goes into"limp-home" mode, at which point the temp rises closer to 100C.

So I would pull the codes from the ECU and see if anything inside the engine isn't working as it should.

But the radiator cap is the first thing to try. I have seen (in my 300SD) an almost 20C drop with a new rad cap.

good luck
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  #30  
Old 11-18-2006, 08:37 PM
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Quote:
Originally Posted by suginami View Post
but how do you explain the fact that his low speed aux fan is not on? They are on at low speed whenever the a/c is used, which is basically all the time. The HVAC system always has the a/c engaged, except when using the EC button.

Sorry, Paul, but that's not true. Low speed aux fans only come on when refrigerant pressure is above the set point. On my M119, aux fans generally do not come on when ambient temps are below 80 degrees F even with AC on.

I'm with buckwheat - I would wonder about how "good" the water pump is. They are known to have impeller problems, so they can still pump coolant but not as efficiently as they should. As I recall, this is a particular problem with aftermarket pumps, but even OE ones can eventually wear.

The fact that coolant temps are getting to the point that they are really seems to point to inadequate coolant circulation.

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