anyone else with this problem???
Senior Member
Joined: Mar 2003
Posts: 422
Likes: 13
Yes the compressor seems to be engaging. The lowest I've seen mine was at 7 bar. So your answer I guess is 7, but when you turn the car on and activate the system, it fluctuates.
The ML....if you were getting HOT air before and are getting cooler air now, maybe you just need more refrigerant. As soon as you refilled it, was it ever really cold? If not, is the temp of the air the same after you refilled it and now? IE has it gotten warmer? If not, it's not uncommon to underfill a system that needed recharging. (Thing is, you shouldn't be leaking refrigerant in the first place). You just need the cabling and guages to check. If you do need more, just make sure you use a can with UV dye in it.
The ML....if you were getting HOT air before and are getting cooler air now, maybe you just need more refrigerant. As soon as you refilled it, was it ever really cold? If not, is the temp of the air the same after you refilled it and now? IE has it gotten warmer? If not, it's not uncommon to underfill a system that needed recharging. (Thing is, you shouldn't be leaking refrigerant in the first place). You just need the cabling and guages to check. If you do need more, just make sure you use a can with UV dye in it.
Thread Starter
Senior Member
Joined: May 2007
Posts: 476
Likes: 0
From: Orange County, CA
CLK 430
OK....you have a refrigerant leak. You should have used the UV dye (it's the same thing...a can with refrigerant in it, mixed with uv dye) but since you didn't....the tech is gonna have to refill again with UV dye to find the leak. Either that or use a sniffer. Just let him/her know you already refilled the system so that he oils the system when he refills it this time as well. (you can't just keep adding refrigerant to a car w/o oiling the system) Keep your fingers crossed......hopefully it's just the compressor. (Still a $800 fix at an inexpensive independant mechanic) 1k normal pricing and 1500 easy at the stealer.
I didn't use the uv dye, looked at it when i was at the store, but didn't get it. is #7 the refrigerant level? cuz when i first recharged it was at a 5 and when i checked it today it was at 2.
And one more, if I here the compressor engaging does that mean it still might be bad?
p.s. really appreciate the help. there's so much to learn about my car
Senior Member
Joined: Mar 2003
Posts: 422
Likes: 13
yes 7 if refrig. level....$200 fix? I would be very careful that he doesn't add any kind of sealant type chemical into your system. TRUST ME....you will end up paying THOUSANDS if you go this route. Get it fixed properly. I don't know of anything that can cause a refrigerant leak that would cost $200 to repair. Your compressor is engaging so it's not "seized", which is a common failure, but it can still be bad. (Busted gaskets --> leaking refrigerant) Even a rebuilt one costs 600 easy. Taking the dash apart will cost you about $1k in labor ALONE. Then you have to pay for whatever is broken and the labor to replace that as well. You DON'T want to take your dash apart!
Thread Starter
Senior Member
Joined: May 2007
Posts: 476
Likes: 0
From: Orange County, CA
CLK 430
so i guess pretty much case closed, its just time to take her into the shop. it was worth a shot. lets just pray it stays cheap
Super Member
Joined: Nov 2003
Posts: 527
Likes: 5
From: TN
2002 c240
Yesterday I was having problems keeping my interior cooled off. The Ac didn't seem to want to go into full blast to help me out. I usually keep it at 72 degrees and it's cold inside, but I was all the way to 68 yesterday and it wasn't getting any cooler.
Today I started it from sitting all night, it blew ice cold for the 3 minutes I had it running. I took these pictures after 3 minutes of idling in a garage with the exhaust going out the open door, but the front enclosed in the garage and building up heat under the hood.
I need to find out what the deal is because it is in the 90's here as of this week. I don't want the AC randomly working.
Today I started it from sitting all night, it blew ice cold for the 3 minutes I had it running. I took these pictures after 3 minutes of idling in a garage with the exhaust going out the open door, but the front enclosed in the garage and building up heat under the hood.
I need to find out what the deal is because it is in the 90's here as of this week. I don't want the AC randomly working.
Last edited by The Jury; Jun 12, 2007 at 03:11 PM.
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Senior Member
Joined: Mar 2003
Posts: 422
Likes: 13
Your evaporator temperature sensor is bad.....it's located above the driver's footwell along the firewall. Your car is showing a value of 118 degrees for that sensor when inside the car it seems to be 81 degree and outside the car it's only 99 degrees. Change it and I bet you will get cold air all the time.
Newbie
Joined: Jun 2007
Posts: 12
Likes: 0
From: Greece
CLK 200
Two weeks ago i had the same problem,hot air and a/c lights always on!
Went to a local MB service and in 1hour the car was ready,he said he changed some kind of relay.I paid only 30euros here.
Sry for my bad English
Went to a local MB service and in 1hour the car was ready,he said he changed some kind of relay.I paid only 30euros here.
Sry for my bad English
Senior Member
Joined: Aug 2003
Posts: 268
Likes: 0
From: NY/CT
CLK 320
Your evaporator temperature sensor is bad.....it's located above the driver's footwell along the firewall. Your car is showing a value of 118 degrees for that sensor when inside the car it seems to be 81 degree and outside the car it's only 99 degrees. Change it and I bet you will get cold air all the time.
After changing my driver's seat motor I've been endowed with newfound confidence that I can probably do this myself... and although that's probably a mistake, at least I'd like to try and see...
Hell, even if I can't figure it out I'm just out $50 and I'll take the car to the dealer. But I'd rather try to do this myself first and see how far I can get.
Member
Joined: Feb 2003
Posts: 227
Likes: 0
From: Bay Area
01 S2000, E46 M3, 99 ML320
I just found this thread on a search but my problem is the reverse.....
NO HEATER! My A/C blows nice and cold but I have no heat whether I have the dial turned to hot or cold on my 99 ML320.
any ideas on this problem? My Mechanic says the ML temp controls are all electronic so he recommends I replace that entire 3 dial control unit.
rick
NO HEATER! My A/C blows nice and cold but I have no heat whether I have the dial turned to hot or cold on my 99 ML320.
any ideas on this problem? My Mechanic says the ML temp controls are all electronic so he recommends I replace that entire 3 dial control unit.
rick
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