Why does my AC blow colder on passenger side then driver side?
Thread Starter
Junior Member
Joined: Feb 2011
Posts: 41
Likes: 0
04 E55
Why does my AC blow colder on passenger side then driver side?
Hello boys, Ok the strangest two things just started occurring with my AC.
1. it blows colder on the passenger side then driver side and
2. After I shut the car down just for a few min and restart the AC blows hot as hell before it gets cold. I understand it takes time for the AC compressor to kick on but damn it blows hot just after a few min of the car being off. Any suggestions?
1. it blows colder on the passenger side then driver side and
2. After I shut the car down just for a few min and restart the AC blows hot as hell before it gets cold. I understand it takes time for the AC compressor to kick on but damn it blows hot just after a few min of the car being off. Any suggestions?
MBWorld Fanatic!
Joined: Jan 2004
Posts: 7,092
Likes: 13
From: Salt Lake City (but not Morm)
2003 E55 & 2014 GL550
Low on freon. 100%. Its a classic symptom. You can charge it yourself with some R from Autozone just make sure it does NOT have the auto seal junk in it.
Forgot what it's called but it's dupont or something. Just make sure it doesn't have any sealer.
Quick charge and she will be good as new.
Forgot what it's called but it's dupont or something. Just make sure it doesn't have any sealer.
Quick charge and she will be good as new.
Thread Starter
Junior Member
Joined: Feb 2011
Posts: 41
Likes: 0
04 E55
That is also what i was thinking, but why would it blow ice cold on the passenger and slightly less on driver side. If it was low on freon it should not blow cold at all on one side. Doesn't One AC compressor run both sides? if one side blows cold then so should the other side?
MBWorld Fanatic!
Joined: Jan 2004
Posts: 7,092
Likes: 13
From: Salt Lake City (but not Morm)
2003 E55 & 2014 GL550
Its a Benz thing....trust me. I battled AC trouble for years and replaced EVERYTHING but the evap. For some reason when the car is low on freon, it is more focused on the pass side.
Unlike American cars for sure.
Quick charge and she will be even on both sides. IMPORTANT to just use one can. Put in 1/4 to 1/2 at first and feel it out. Too much (more than one can over) can be deadly for these systems. If she still doesn't work you have other trouble. Near positive a charge will have you happy through the summer.
Benz stealer has a machine that fills it up with proper pressure/amount but expect rape prices for sure.
Unlike American cars for sure.
Quick charge and she will be even on both sides. IMPORTANT to just use one can. Put in 1/4 to 1/2 at first and feel it out. Too much (more than one can over) can be deadly for these systems. If she still doesn't work you have other trouble. Near positive a charge will have you happy through the summer.
Benz stealer has a machine that fills it up with proper pressure/amount but expect rape prices for sure.
MBWorld Fanatic!
Joined: Mar 2011
Posts: 1,315
Likes: 4
E55, SL63, ML550
MBWorld Fanatic!
Joined: Dec 2006
Posts: 1,124
Likes: 32
From: Florida-Germany-New York
2004 E55,1969 300SEL6.3,2011 ML350 BlueTec Diesel,2005 ML400 CDI
Its a Benz thing....trust me. I battled AC trouble for years and replaced EVERYTHING but the evap. For some reason when the car is low on freon, it is more focused on the pass side.
Unlike American cars for sure.
Quick charge and she will be even on both sides. IMPORTANT to just use one can. Put in 1/4 to 1/2 at first and feel it out. Too much (more than one can over) can be deadly for these systems. If she still doesn't work you have other trouble. Near positive a charge will have you happy through the summer.
Benz stealer has a machine that fills it up with proper pressure/amount but expect rape prices for sure.
Unlike American cars for sure.
Quick charge and she will be even on both sides. IMPORTANT to just use one can. Put in 1/4 to 1/2 at first and feel it out. Too much (more than one can over) can be deadly for these systems. If she still doesn't work you have other trouble. Near positive a charge will have you happy through the summer.
Benz stealer has a machine that fills it up with proper pressure/amount but expect rape prices for sure.
Trending Topics
MB World Stories
The Best of Mercedes & AMG
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
10 Most Reliable Mercedes-Benz Models You Can Buy Used
Verdad Gallardo
MBWorld Fanatic!
Joined: Jun 2009
Posts: 4,429
Likes: 61
From: Cypress, TX
'06 E55, '15 Jeep SRT8, '94 Mustang GT
Super Member
Joined: Dec 2004
Posts: 783
Likes: 22
From: Atlanta
06 E55 Black
MBWorld Fanatic!
Joined: Jan 2004
Posts: 7,092
Likes: 13
From: Salt Lake City (but not Morm)
2003 E55 & 2014 GL550
Dont forget to run the car and have AC cranking on high when you fill.
MBWorld Fanatic!
Joined: Jan 2004
Posts: 7,092
Likes: 13
From: Salt Lake City (but not Morm)
2003 E55 & 2014 GL550
Sorry to overpost. Just thoughts popping in as I am working.
LAST THING. Do NOT turn the can upside down when filling. If the can goes ice cold and stops flowing, don't tip her upside down. That is the old way of thinking/filling it and you don't want liquid going into that gas line.
Just a heads up.
LAST THING. Do NOT turn the can upside down when filling. If the can goes ice cold and stops flowing, don't tip her upside down. That is the old way of thinking/filling it and you don't want liquid going into that gas line.
Just a heads up.
MBWorld Fanatic!
Joined: Jan 2004
Posts: 7,092
Likes: 13
From: Salt Lake City (but not Morm)
2003 E55 & 2014 GL550
Do you have gauges? If so I can take a reading of mine and let you know what I have.
Otherwise don't sweat it too much about overfilling. Just throw in a half can and she should be fine. I have actually overfilled mine to where it activated the blowoff valve. In my face too. That was fun. System is fine so they are pretty tough.
Warning though, you may have a small leak somewhere. If she comes back after this, time to start sleuthing with a sniffer for where it's coming out.
Otherwise don't sweat it too much about overfilling. Just throw in a half can and she should be fine. I have actually overfilled mine to where it activated the blowoff valve. In my face too. That was fun. System is fine so they are pretty tough.
Warning though, you may have a small leak somewhere. If she comes back after this, time to start sleuthing with a sniffer for where it's coming out.
Super Member
Joined: Sep 2009
Posts: 618
Likes: 3
2006 CL600
Regards
MBWorld Fanatic!
Joined: Jan 2004
Posts: 7,092
Likes: 13
From: Salt Lake City (but not Morm)
2003 E55 & 2014 GL550
Here ya go. It's this one. Quick cell pic so forgive the qual. Sorry if I confused. Was taking it all from memory. One on the right 100%. Don't even think the Autozone kits would connect to the other port. No worries.
Junior Member
Joined: Dec 2007
Posts: 34
Likes: 0
From: Houston, Tx
2005 E55
So I have this problem and I added refrigerant and immediately the temp drops on the driver side and the passenger side, but they never get to the same temperature. The driver side stays in the mid 50s while the passenger side goes to 44 and stays. Are they supposed to get to the same temperature?
Super Member
Joined: Nov 2004
Posts: 992
Likes: 11
From: Illinois
GL550, C55, 335i Coupe, vintage Mustang
Most likely, you have a heater shut-off valve sticking or stuck partially open. If you have good pressures in the system as per this chart and evaporator temp(measured at the vent with the coldest output) then your shut off valve is sticking. Remember that on a 211 if you have the AC on, then the car opens the corresponding port of the heater shut off valve to raise the vent temperatures of the side that requests the warmer temperature. It is a $50 part, and it is under the wiper mechanism on the drivers side.
MBWorld Fanatic!
Joined: Jan 2004
Posts: 7,092
Likes: 13
From: Salt Lake City (but not Morm)
2003 E55 & 2014 GL550
Yeah they are supposed to be the same or at least close.
2 options. You take it Benz and have them fill with the correct amount of freon so you know how much you are supposed to have. Their machine will add and subtract until it is OEM.
Or and/or I guess its have them do that valve or take a whack at it yourself. Directions and good ones on the forum on just how to do it. Takes a couple hours for your first time.
Yes it could be that heater valve.
In my opinion, not enough coolant added but I sure as heck am not gonna be irresposible and say add more!
2 options. You take it Benz and have them fill with the correct amount of freon so you know how much you are supposed to have. Their machine will add and subtract until it is OEM.
Or and/or I guess its have them do that valve or take a whack at it yourself. Directions and good ones on the forum on just how to do it. Takes a couple hours for your first time.
Yes it could be that heater valve.
In my opinion, not enough coolant added but I sure as heck am not gonna be irresposible and say add more!
