|04-15-2011, 07:49 AM||#1 (permalink)|
AC Blowing Warm Air Left Side/Cold on Right
On my mothers 2000 E430 she's getting warmer air out of the right half of her vents than the very cold air coming from the right side vents.
The dealer says it's indicative of a evaporator core having a leak. Quoted me about $4500.00 to do it.
To me, if it had a leak, then the ac shouldn't be blowing cold AT ALL. I was thinking more along the lines of it bleeding outside air in on that side, or air from the heater core from a door that's not fully closing. The left and right side are just fighting it out now.
I pulled the DTC's from the Climate Controls' LCD readout (this was the day after the dealer had the car).
B1234 - Sun sensor (B32)
B1416 - Coolant circulation pump (M13)
My 70 yr old mom does chemo every other week, this is Texas, she 'gots to have' her AC. Right now she's driving my 01 E430 while I try to get this handled.
Any knowledgable help would be appreciated.
Driver - Austin, Tx
'01 E430 - Silver, Xenons, Light Alloys
Other family Mercs - 97 E420, '99 E320 Wagon & '00 E430
|04-15-2011, 07:59 AM||#2 (permalink)|
Date registered: Dec 2009
Vehicle: 2004 CLK55 AMG / 2001 ML430 Sport / 2000 E320 / 1950 Olds "Rocket 88" / RIP-2001 E320 4matic wagon
Location: New Jersey
Is the cold side "Real" cold or is one side hot and other cool? Mine was like that and all it needed was a top off of refrigerant. Check the sticky's for "Duo valve". This valve controls the coolant going to each side of the heater core. It's possible that one side is stuck and keeping the heater core hot all the time, even when AC is on.
I've never done the job but the DIY looks simple.
Last edited by rnettleship; 04-15-2011 at 08:01 AM.
|04-15-2011, 08:08 AM||#3 (permalink)|
Date registered: Oct 2010
Vehicle: 1999 E300 TD
Appreciate the seriousness of the matter. You recovered about a third of the info with the faults. Now go back to the stickies and run the actual value test. Thats the data generated by all the AC sensors on the car. Stop at number 8. Report the data and I am sure you will get assistance.
The faults you have recovered, sun sensor impacts fan speed in relationship to the inside car temp and radiance of the sun. The coolant circulation pump impacts heating the car after the engine has stopped and you selected the recirculate button on the AC control.
Non of your faults relate to the loss of cooling on one side. Good luck
Last edited by Plutoe; 04-15-2011 at 08:10 AM.
|04-15-2011, 08:12 AM||#4 (permalink)|
The other side is COLD. I saw the DIY about the DuoValve and am keeping that in mind. It seems more like the left side is bleeding outside air in more than the heater being stuck on. It feels like outside ambient air (hot during the day/cooler at night). Although this could just be the left and right side of the car battling, with the AC more effective after the sun goes down.
|04-15-2011, 08:13 AM||#5 (permalink)|
Date registered: May 2007
Vehicle: S320 (W220) and Zotye 1.3/Rolls Royce on back order (LOL)
Location: Jiangsu province China
Top up the refrigerent at this stage and all should come back to normal.
"I am enclosing two tickets to the first night of my new play; bring a friend, if you have one."
- George Bernard Shaw to Winston Churchill.
"Cannot possibly attend first night, will attend second ... if there is one."
- Winston Churchill, in response.
|04-15-2011, 08:17 AM||#6 (permalink)|
|04-15-2011, 09:16 AM||#7 (permalink)|
BenzWorld Senior Member
Date registered: Mar 2010
Vehicle: 88 560SL - 01 C240 - 02 E320 4matic Wagon
My car had this a few weeks ago. Dealer told me that it was common for the right side to be colder than the left when the system was low on refrigerant.
I was thinking it was the Duo-valve and wanted this fixed before the warranty ran out - the difference in the temps was not all that great. Sure enough -- leak at one of the sensors.
A quick check on the duo valve: Put the system on Low -- EC for economy -- and low fan speed -- feel the air. The air should not be heated. Obviously do this with a hot running engine.
|04-15-2011, 12:49 PM||#8 (permalink)|
Date registered: Oct 2010
Vehicle: 1999 E300 TD
Forget the Duo valve, that's all black magic, the faults did not indicate that was a problem. You will run your tail ragged with that type of stuff. To get the "actual value data" do the following.
Start the car and let it warm up, press the AC auto button, set both sides to 72 degrees, then press REST for at least five seconds----The left display will show a number 1 and the incar temp-----Now press the auto button and number 2 with data will come up----Press the auto button until you have gotten to number 8-----------To exit the program press REST.
Remember to write down the number and corresponding data before you exit the program. Good luck!!
|04-15-2011, 01:31 PM||#9 (permalink)|
Date registered: Mar 2005
Vehicle: '01-E320 & 02-ST2
Location: John 15:18-19
Anyway, this is a more complete explanation of the process. Good luck.
Air Conditioning Diagnosis | EClassBenz.com
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|04-15-2011, 03:57 PM||#10 (permalink)|
Date registered: Jan 2010
Vehicle: 99 E430, 01 E430 Sport, 00 SL500
Location: LA, CA
>>B1416 - Coolant circulation pump (M13)
Maybe the dealer saw that B1416 then quoted $4500.
I had left warm, right cold problem before. "Servicing" the duovalve following the stickies did not help. The values of sensor#3, #4 were still way off from each other; their difference was as much as 15. I think Matt L once said that #3, #4 should read about 2 or 3 from each other when duovalve worked. Anyway, I charged a little more refrigerant into the AC, putting the can upside down. On the gauge, there was a blue zone for filled pressure, I went for the border line between blue and yellow. Both vent sides blew cold right after I did that. Sensor #7 fluctuated between 15-17 at idle. In my other car, sensor#7 reads 15 but the AC worked perfectly.
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