Heating problem
Thread Starter
Senior Member
Joined: Sep 2009
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From: Lincoln, NE
2002 Mercedes Benz E320
Heating problem
I feel like there's a problem with the heating in my car. It feels really weak compared to my old car. I put it on the max the other day on 85 and it barely blows any hot air out. This doesn't really help with the cold weather we've been having.
Anybody know what the deal is?
Anybody know what the deal is?
Junior Member
Joined: Feb 2009
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From: Portland, OR
97 E-420
I feel like there's a problem with the heating in my car. It feels really weak compared to my old car. I put it on the max the other day on 85 and it barely blows any hot air out. This doesn't really help with the cold weather we've been having.
Anybody know what the deal is?
Anybody know what the deal is?
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300E a couple 1994 w124wagon E320 Wagon/,1971MGB Track/Rally, MG Midget Autocross ,2000 E320 wagon.
The one on the
left side of the dash cluster display.
Either the coolant is low or your tstat is going..
The EC light has nothing to do with it at all,whoever brought that up.
Is it blowing full force but not blowing hot hot air>
First check the res for coolant level and then replace the tstat.
Either the coolant is low or your tstat is going..
The EC light has nothing to do with it at all,whoever brought that up.
Is it blowing full force but not blowing hot hot air>
First check the res for coolant level and then replace the tstat.
Thread Starter
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From: Lincoln, NE
2002 Mercedes Benz E320
I usually wait till the needle is about halfway before turning on the heat. I turned it up all the way to the max and the air is warm but it isn't like really really hot. I pressed the EC button and I did notice a small difference I think.
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99
hi,
I just had a similar problem. i just had the coolant changed. And after about 80 miles worth of driving i randomly get the message displayed "coolant level". i also feel as if my hot air isn't as hot as it used to be. Unless its all in my head.
Thermostat has never been changed after 100k plus miles.
I haven't seen any coolant leaking around. I still have to check the coolant reservoir. This just happened to me tonight.
Anyone have any tips as to what tests i should perform.
THANKS
I just had a similar problem. i just had the coolant changed. And after about 80 miles worth of driving i randomly get the message displayed "coolant level". i also feel as if my hot air isn't as hot as it used to be. Unless its all in my head.
Thermostat has never been changed after 100k plus miles.
I haven't seen any coolant leaking around. I still have to check the coolant reservoir. This just happened to me tonight.
Anyone have any tips as to what tests i should perform.
THANKS
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Newbie
Joined: Jan 2010
Posts: 9
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From: London, On
99 E320 4Matic Sedan
I also have the same problem. It gets warm in the cabin, but not like my other cars. I checked the coolant, looks good. Water temp gauge reads just below 80 when the car is at op temp. I will have to purchase a new t-stat, any idea on a rough price from a dealer? Looks to be a basic install.
Last edited by 4matico; Jan 28, 2010 at 10:35 PM.
Thread Starter
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From: Lincoln, NE
2002 Mercedes Benz E320
Forgot about this thread almost. Also when I press that button with arrows pointing to the face, floor, or up the air blows in all directions. Is it only supposed to blow in the selected areas or all of them? Like if I choose the setting that blows down and up it would still blow from all the vents. Is it supposed to be like that?
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99
I believe when you have the heat on. Its only supposed to blow from the passenger vent and drivers vent, and the dash. The center vents i believe were designed not to blow hot air based on what i read in older threads. Only time they should work along with everything else is during a/c.
Anyone have any other idea or tip as to my question above.
Anyone have any other idea or tip as to my question above.
Thread Starter
Senior Member
Joined: Sep 2009
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From: Lincoln, NE
2002 Mercedes Benz E320
I meant like when I press the button and set it to the down arrow it still blows from all the the side vent next to the door and near the windshield. I thought the arrows mean you choose where the air goes. Floor, windshield, face...
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From: SoCal
98 Brilliant Silver E320 Wagon
Although I hardly ever use it. Mine seems to function as the icon describes directing air flow according to the arrows.
There is a second diagnostic built into the CC controller on the dash. You can bring it up and test the functioning of the flaps. Similar to the one for A/C trouble codes. It's pretty detailed with lots of references to other documents. MB doc AD83.40-P-3002B. Maybe someone can post it but each check references another document you would need as well.
There is a second diagnostic built into the CC controller on the dash. You can bring it up and test the functioning of the flaps. Similar to the one for A/C trouble codes. It's pretty detailed with lots of references to other documents. MB doc AD83.40-P-3002B. Maybe someone can post it but each check references another document you would need as well.
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From: USA
10 speed bicycle
Most likely sounds like your Duovalve is faulty(common problem). The duovalve regulates the flow of coolant to the heater core by intermittently(similar to PWM) switching the ground circuit of the Duovalve in relation to temp output request.
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From: SoCal
98 Brilliant Silver E320 Wagon
Up Arrow only: Some flow from defroster vents but still majority of flow from vent above headlight switch. No flow from vent near gas pedal.
Including Down Arrow produced some flow from vent near gas pedal. Others no change.
In all combinations flow from vent above light switch was substantial.
Pressing defroster button produced full flow from defroster vents.
Thread Starter
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From: Lincoln, NE
2002 Mercedes Benz E320
I had a chance to check mine and found the following.
Up Arrow only: Some flow from defroster vents but still majority of flow from vent above headlight switch. No flow from vent near gas pedal.
Including Down Arrow produced some flow from vent near gas pedal. Others no change.
In all combinations flow from vent above light switch was substantial.
Pressing defroster button produced full flow from defroster vents.
Up Arrow only: Some flow from defroster vents but still majority of flow from vent above headlight switch. No flow from vent near gas pedal.
Including Down Arrow produced some flow from vent near gas pedal. Others no change.
In all combinations flow from vent above light switch was substantial.
Pressing defroster button produced full flow from defroster vents.
Now that you remind me of the defroster. When I turn my rear defroster on some of my radio stations don't work, they become all static-y. This was not the case when I first bought the car.
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From: SoCal
98 Brilliant Silver E320 Wagon
The radio antenna is made up of several components including the wires of the rear window defroster. Not sure what the interference could be. There is an antenna amplifier in one of the rear columns. Sometimes connections are bad there. Also, window tinting films (the ones with metal in them) are bad actors for radio reception. In my wagon it is in the C column (drivers side) but not sure on sedan.
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From: NY & FL
MB’s of all kinds.
It may not be a heating issue. I mean it is like -5 here and even with my E320 in the garage when I take it out and its fully warmed up it still doesnt feel as hot as it should. My point being that its just sooo damn cold out. Even with heated seats on it still feels like a chill.
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1997 s320, 1997 e320
bigboss, when was the last time you changed the cabin filter? you would be surprised how much airflow a dirty cabin filter can affect.
also another know issue with our cars is the blower motor regulator. a common sign of it failing is very weak airflow. you will know when it's going bad because you will get very weak airflow and also hear a hissing sound. i have changed 2 blower motor regulators in the last 6 years, seems like they were bad design. but as long as your car gets warm or cold at a reasonable time i wouldn't worry about changing it, regulator cost around $90 by the way.
also another know issue with our cars is the blower motor regulator. a common sign of it failing is very weak airflow. you will know when it's going bad because you will get very weak airflow and also hear a hissing sound. i have changed 2 blower motor regulators in the last 6 years, seems like they were bad design. but as long as your car gets warm or cold at a reasonable time i wouldn't worry about changing it, regulator cost around $90 by the way.
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2005 E320 4matic wagon
cabin air filter
Tirona,
This something I've been thinking about doing. How do you change this? Where to look for it? There are two filters right? Looking for input on how to do it. Thanks, MJ
This something I've been thinking about doing. How do you change this? Where to look for it? There are two filters right? Looking for input on how to do it. Thanks, MJ
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1997 s320, 1997 e320
http://www.mann-hummel.com/mf_prodka...BCPN0wqkur.pdf
there might be better instructions on benzworld also, you might want to check there too. first time might take longer, but after you do it once it's a 5 min job.
there might be better instructions on benzworld also, you might want to check there too. first time might take longer, but after you do it once it's a 5 min job.
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From: SoCal
98 Brilliant Silver E320 Wagon
Looking for something else I ran across a Service Bulletin about radio interference when the rear defroster is turned on. Cause could be bad electrolytic capacitor in the defroster circuit. Not sure but I would assume it's near where power attaches to defroster grid. Hope this helps some.
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300E a couple 1994 w124wagon E320 Wagon/,1971MGB Track/Rally, MG Midget Autocross ,2000 E320 wagon.
Give a thump
to your am/fm diversity amplifier.
That might clear up the static.
If not take a peak at it and make sure all the wires are in place.
That might clear up the static.
If not take a peak at it and make sure all the wires are in place.
