Help!! A/C Problem in hot, summer heat!

Jul 7, 2004 | 11:26 PM

TRJNHRZ

Thread Starter

Newbie

Joined: Jun 2004

Posts: 4

Likes: 0

1999 E430

Help!! A/C Problem in hot, summer heat!

Please help! The A/C in my '99 E430 seems to work whenever it feels like it. It works fine for 3-4 days, and then all of a sudden it'll blow hot air. The very next day, it'll blow cold air.. and then a few days later it'll blow hot air again. Anyone have an idea of what the problem is? I've "heard" that it either needs refrigerant or a malfunctioned compressor. Please help, California heat in summer is unbearable.. even for short periods of time!

Thx!

Jul 8, 2004 | 12:40 AM

MARK CUMMINS

MBWorld Fanatic!

Joined: Nov 2001

Posts: 3,861

Likes: 3

From: Jacksonville Florida

209/W210 Estate /W211 modded by MBENZNL

Quote:

Originally Posted by TRJNHRZ

I Would replace the A/C Evap Temp sensor..Its located in the A/C Evap...remove the left under dash to replace it..its located in the center of the housing
a 10min job

I Have seen SEVERAL of the sensors go bad ..with the same complaint as you have posted..

Also do a search on the W210 a/c controls for a read out ..Just to be sure..You will be able to read the values on the A/C control unit screen for the sensor It will be out of spec!

Jul 8, 2004 | 01:51 PM

TRJNHRZ

Thread Starter

Newbie

Joined: Jun 2004

Posts: 4

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1999 E430

Mark,

Thanks for the info! Not sure I'm following you on what you mean for doing a search on the A/C controls. Can you elaborate?

Thx!

Sep 7, 2004 | 01:31 PM

yugger

Newbie

Joined: Nov 2003

Posts: 14

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From: San Francisco, CA

1997 E420

similar thing happened to me

Strange thing happened to me a couple times this weekend. It was in the upper 90s and I was driving along with the A/C on when all of a sudden, hot air started coming out of the driver's side and foot vent. I turned the climate control on and off a couple times, but that didn't help. Then stopped for about 30 mins, got back into the car and everything worked fine again. Later in the weekend, hot air started coming out of the passenger side vent. Turned off the climate control for a bit, turned it back on, and all was ok again. Seems to be working fine again...for now.

Strange that it's only 1 vent at a time. Does anyone have any ideas on this?

BTW, it's a '97 E420

Thanks in advance!

Sep 7, 2004 | 05:57 PM

yugger

Newbie

Joined: Nov 2003

Posts: 14

Likes: 0

From: San Francisco, CA

1997 E420

by the way

... the other vents that weren't blowing hot air worked normally, blowing ice cold air. This seemed to make the whole climate control system go nuts.

Jun 20, 2005 | 04:45 PM

why_not

Senior Member

Joined: Sep 2004

Posts: 313

Likes: 4

W212 2009, W115 Pullman & EQC

A/c

Did u solve the problem ??
My car did the same thing today..

Its ok again now..
Did a diag test..

Evap sensor is "2" right now.. is that normal ?..
Pressure: 13bar

Right now i have several diag codes..
Evap sensor
Incar temop
heater core temp
Refrig temp
Refrig pressure
sun sensor
and
serious IF to Instrument cluster

Can these be old codes from before i got the A/C refilled ?
If yes..Is there any way to reset these codes ?

Thanks
/kim

Last edited by why_not; Jun 20, 2005 at 04:48 PM. Reason: forgot..