My Climate Control is Crazy!!
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Super Member
Joined: Nov 2002
Posts: 766
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From: San Francisco
CLk320
My Climate Control is Crazy!!
i have a 87 420SEL, there is something wrong with my climate control...it takes forever for the temperature that i want...like when i want it to be blow some warm air, it takes awhile for the transition from cold to warm(takes like about 20 mins) and when it stops being cold it blows hot not warm. it can never jus be rite...and it always is blowing something out...even when i turn it off. does anyone know whats going on? thanks
-Greg
-Greg
Member
Joined: Jun 2003
Posts: 101
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From: Cornwall, NY
e320 2000
Crazy Climates run in the family
My 91' 420 SEL gets a bit nuts too, at times.
On a long drive last week, my A/C kept chilling the windshield, even though I had the controls set for floor.
I ended up putting a Rand McNally map book over the driver's side to keep the condensation to a minimum.
It's generally OK in normal driving. Still cold after a change over from the R12 2 years ago.
On a long drive last week, my A/C kept chilling the windshield, even though I had the controls set for floor.
I ended up putting a Rand McNally map book over the driver's side to keep the condensation to a minimum.
It's generally OK in normal driving. Still cold after a change over from the R12 2 years ago.
Newbie
Joined: Jan 2003
Posts: 9
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It's possible that you have a faulty monovalve. I do not know it's location on a 420SEL, but in the 88-91 300SEL, it's on the passenger side between the 2 "firewalls". It has a small rectangular shaped cover about 2" long and maybe just over an inch wide. 4 small phillips head screws hold it down.
There's a diagphram kit that can be purchased. You pull the screws, then the cover and replace the diagphram. This item causes all sorts of falky temp. variations. It can cause heat to go from good to zilch in the winter and intermix warm air from the heater control valve which it's a part of with cooler a/c air.
Lots of talk about this item at mercedesshop.com
There's a diagphram kit that can be purchased. You pull the screws, then the cover and replace the diagphram. This item causes all sorts of falky temp. variations. It can cause heat to go from good to zilch in the winter and intermix warm air from the heater control valve which it's a part of with cooler a/c air.
Lots of talk about this item at mercedesshop.com
