Air Conditioning issues!!!
Newbie
Joined: Jul 2012
Posts: 8
Likes: 0
From: UK/POLAND
W211
this is a classic symptom of low refrigerant level. These cars are designed to blow hot on one side/cold on one side if refrigerant runs low!
You do have independant vents (pass and driver) so its NOT the vent door. That may have been the case if you had an older chevy.
Go get it topped off - usual A/C checkup is 1/2 hr labor and cost of refrigerant at dealer so you can probably get by with 100 bucks or less if you don't have a major leak.
the valves for Hi and Lo sides leak minor gas by design. make sure the caps are tight! if you put couple drops of water on them you can probably see the bubbles coming off. the tight caps keep the system sealed.
don't waste your time on diagnosing further - get refrigerant!
You do have independant vents (pass and driver) so its NOT the vent door. That may have been the case if you had an older chevy.
Go get it topped off - usual A/C checkup is 1/2 hr labor and cost of refrigerant at dealer so you can probably get by with 100 bucks or less if you don't have a major leak.
the valves for Hi and Lo sides leak minor gas by design. make sure the caps are tight! if you put couple drops of water on them you can probably see the bubbles coming off. the tight caps keep the system sealed.
don't waste your time on diagnosing further - get refrigerant!
Member
Joined: Jul 2007
Posts: 121
Likes: 0
From: Dallas
E500, 3000GT and 3000GT VR-4, 335i
Gonna bump this, but either way I gotta take the car in for service tomorrow, but I noticed this today.
My E500 is blowing cold air front the center vents but both side vents (driver and passenger) are blowing hot air. Anyone else have this issue? It seems weird to have it set up like that. I figured one side would be cold while the other went hot, not hot on the outside vents and cool on the inside.
My E500 is blowing cold air front the center vents but both side vents (driver and passenger) are blowing hot air. Anyone else have this issue? It seems weird to have it set up like that. I figured one side would be cold while the other went hot, not hot on the outside vents and cool on the inside.
Newbie
Joined: Mar 2015
Posts: 4
Likes: 0
2004 mercedes-benz e320
Hi, I have a problem with my 2004 E320, in the mornings ac is really cold and in the afternoons it is hot. I have changed the ac compressor and the expansion valve and the problem remains. I also notice that sometimes the passenger vents are colder than the driver's vents.
Newbie
Joined: Jan 2015
Posts: 7
Likes: 0
07 E550
Thank you for the replies. Moby, I checked all the thump wheels as suggested, and it was fully opened. I closed them to check if they do operate correctly, and it seems that they are not the problem. Sitting in the front seat in the most backward position, I hold my arm about 6" from the rear vents and can feel the air coming from the front much stronger than the air coming from the rear vents. I made sure that all the front vents was open, to prevent the front air to be stronger at the centre vents.
With regards to the gas, the gas were pumped out (extracted) and the system was pressure tested, and apparently it is 100%. It was refilled to the correct level and the temperature coming from the vents compared to air conditioner setting. According to the technician who worked on the car, everything is 100%. I have taken the car back and the service provider told me that the results is as good as one can get from the system and that I cannot compare this car's with another, but they do agree that it do not work effectively. They suggest that I replace all the filters. I checked all the filters, which look good in my opinion, but I tested the air conditioner with all the filters removed, without better results.
Driving home today in 19°C and the air conditioner set to the lowest setting (Lo on screen), it took about 15 minutes before I could feel that the temperature of the air starts to cool down. It is a sunny day with very low humidity, which should not be a problem for an air conditioner. My other car, a black ML270CDi, will blow cold air within 5 minutes after she stands for hours in the sun in summer on a 38°C to 43°C day, which is hot. I can not believe that all is 100% with the car's air conditioner.
I have cleaned the air conditioner's radiator (don't know the correct name) on the outside to make sure it is free from any blockages and that it can operate to its potential.
I am frustrated that the "experts" are not able to sort it out and tell me to accept that the car's air conditioner is not as effective as I would like. Any suggestion will be appreciated.
With regards to the gas, the gas were pumped out (extracted) and the system was pressure tested, and apparently it is 100%. It was refilled to the correct level and the temperature coming from the vents compared to air conditioner setting. According to the technician who worked on the car, everything is 100%. I have taken the car back and the service provider told me that the results is as good as one can get from the system and that I cannot compare this car's with another, but they do agree that it do not work effectively. They suggest that I replace all the filters. I checked all the filters, which look good in my opinion, but I tested the air conditioner with all the filters removed, without better results.
Driving home today in 19°C and the air conditioner set to the lowest setting (Lo on screen), it took about 15 minutes before I could feel that the temperature of the air starts to cool down. It is a sunny day with very low humidity, which should not be a problem for an air conditioner. My other car, a black ML270CDi, will blow cold air within 5 minutes after she stands for hours in the sun in summer on a 38°C to 43°C day, which is hot. I can not believe that all is 100% with the car's air conditioner.
I have cleaned the air conditioner's radiator (don't know the correct name) on the outside to make sure it is free from any blockages and that it can operate to its potential.
I am frustrated that the "experts" are not able to sort it out and tell me to accept that the car's air conditioner is not as effective as I would like. Any suggestion will be appreciated.
What you cleaned off is your radiator. There are two components that should be cleaned in order for refrigerant to remove heat from inside car to outside the car. That is your condenser. The second part is called your evaporator. That is what the filtered air passes over which makes the air cold. Also, did you notice what type of refrigerant was used? 134a is the proper type. Needs to have an (a) at the end. Stands for aziotropic. Never release refrigerant into the atmosphere! If caught you WILL BE FINED BY EPA! HVAC problems boil down to two types. Refrigeration and air flow. Sounds like there may be a damper in your ducting that has closed or is not open all the way. If that is the case, your condenser will not get enough hot air blowing over it for the refrigerant to"boil" into a gas. That makes for an extremely inefficient system. Find the air flow issue first. Then once air is flowing correctly, work on your refrigerant issue. Hope this helps. BTW I'm an HVAC tech certified COMMERCIAL AND RESIDENTIAL/ 3years in trade school with a 3.8GPA/ 9 years in the field. Car HVAC systems are a little different. I would take it to a different dealership. Not all car mechanics know HVAC. that is just a plain fact. It's not always a mechanical problem. If air flow is restored and you still have a cooling problem, ask dealership to have condenser and evaporator cleaned. That is imperative for an efficient system!
MB World Stories
The Best of Mercedes & AMG
6 Mercedes Models That Did NOT Age Well (But Are Somehow Still Cool)
Verdad Gallardo
Manual Mercedes? 6 Times Sindelfingen Let Drivers Have All The Fun
Verdad Gallardo
Mercedes SLR McLaren 722 S Is Extremely Rare Example Modified by McLaren
Verdad Gallardo
8 Classic Boxy Mercedes Designs That Have Aged Like Fine Wine
Verdad Gallardo
Flawlessly Restored Mercedes 190E Evo II Heads to Auction
Verdad Gallardo
Electric Mercedes C-Class Unveiled: 11 Things You Need to Know
Verdad Gallardo
Mercedes EQS Gets A Major Update: Everything You Need to Know
Verdad Gallardo
5 Underrated Mercedes-Benz Models That Don't Get the Love They Deserve
Verdad Gallardo
Mercedes 300D Has Pushed Well Past 1 Million Miles and It Ain't Stopping
Verdad Gallardo
Newbie
Joined: Jan 2015
Posts: 7
Likes: 0
07 E550
Hi, I have a problem with my 2004 E320, in the mornings ac is really cold and in the afternoons it is hot. I have changed the ac compressor and the expansion valve and the problem remains. I also notice that sometimes the passenger vents are colder than the driver's vents.
