Hi Guys! Can anyone help regarding information on my 92'W140 300SEL Rear A/C Unit is blowing Hot Air. Is there a separate evaporator and where is it located? The front A/C is working fine! Thanks guys. Can I rectify DIY or send it to a A/C shop?

There was a reason why this was so... it has been discussed before. I am curious too because the S420 does the same thing, it's never in sync with the front, if I remember correctly. I think this is normal, but, we need to know why!?

__________________
2006 E350 w/ 155k miles (Daily Driver)

Previous:
1993 300E 3.2L Sedan w/ close to about 300k miles
2003 E500 Brilliant Silver (Had 217k miles when totalled!)
1989 300E with 289,000 miles (had for <1 yr while in HI)
03 CLK 500 cabrio (Mom's)
2006 C230k (Dad's)
1999 S420 (Mom's/Dad's)
2000 C230k Sport sedans
2001 CLK320 Cabrio (Mom's)
1995 C280 My First Mercedes-Benz... (155k miles. EXCEPTIONAL AUTOMOBILE. Was Very hard to let go of!)

Hi David!
So this is not just happening to my car but typically to S-Class W140 models huh!!!!!!
So can any members advise us what's happening and what remedy to take. Appreciate you guys input. Thanks.

Chris,
Yes, I think it is supposed to be like this. I can't recall why though...? Try doing a search. I am sure someone will come along soon and help us out!

__________________
2006 E350 w/ 155k miles (Daily Driver)

Previous:
1993 300E 3.2L Sedan w/ close to about 300k miles
2003 E500 Brilliant Silver (Had 217k miles when totalled!)
1989 300E with 289,000 miles (had for <1 yr while in HI)
03 CLK 500 cabrio (Mom's)
2006 C230k (Dad's)
1999 S420 (Mom's/Dad's)
2000 C230k Sport sedans
2001 CLK320 Cabrio (Mom's)
1995 C280 My First Mercedes-Benz... (155k miles. EXCEPTIONAL AUTOMOBILE. Was Very hard to let go of!)

Hey David! So I am not the only one out there and thought mine have gone bonkers!!!!!!!
Say any senior members can help us would much appreciate coz everytime someone behind turns on the blower it gets me real HOT literally. Thanks again for additional input from you guys. Cheers!

Guess it's time to chime in and explain the 140 HVAC system in detail. Not all 140 chassis had the rear AC, usually just some SEL versions. If you're thinking cold air will come out from the back of the console vent that faces the rear passengers, sorry that's not rear AC but just a vent. I had the same question on mine a few years ago and was told this. The rear AC is usually another evaporator in the trunk blowing forward. Read your owner's manual for a detailed description of the system or check your trunk area.

Tobias MB
4 MBs

Hi Tobias!

Yes you are right I guess coz mine is a 300SEL model and they come with seperate evaporator for front and rear.

I suppose the rear A/C blower is out of gas or system is choked-up thus giving hot air from vent.

This looks like the job for a professional A/C man!!!!!!!!

Thanks for the info and will confirm it with my manual which is kept somewhere in the car.

Best Regards.