2000 S500v, AC / Heater inop!!! HELP?
Thread Starter
Newbie
Joined: Apr 2009
Posts: 7
Likes: 0
From: San Diego, CA
2000 S-500v
2000 S500v, AC / Heater inop!!! HELP?
New to this site but, I do need some help with 2000 s-500.... I recently had my ignition computer & key changed out. A couple days afterward my AC/Heater stopped working. It will only come on ever so slightly after 75+ mph on freeway... Someone told me to check & test the blower motor regulator... Where exactly is this located??? Anyone out there have this problem b4 & or any DIY with pics so I can get this fixed mysrlf b4 this hotazz Cali summer 
jumps on me?????
Thnx, YTFLK187!!!!
jumps on me?????Thnx, YTFLK187!!!!
MBWorld Fanatic!
Joined: Dec 2004
Posts: 3,063
Likes: 26
From: Tampa, FL
2005 S500 4-Matic, 1978 450SL
Thread Starter
Newbie
Joined: Apr 2009
Posts: 7
Likes: 0
From: San Diego, CA
2000 S-500v
I bought the Bosch part and replaced it. Blowing like it's supposed to but, the day before I changed it out. The red light on my Ac button came on and won't go off. I was told by the dealer that it's in Failsafe mode. Most likely because the Refrigerant is too low. I had my friends shop recover and replace the refrigerant to the proper level and it still did not go off. i don't want to take it to the shop and have them charge me a ****load of $$$ just to reset the fault code if that's all it needs. Do you know if it's probably something else or how to reset it so it will engage and start cooloing my car down. It's hotazzhell out here.
MBWorld Fanatic!
Joined: Dec 2004
Posts: 3,063
Likes: 26
From: Tampa, FL
2005 S500 4-Matic, 1978 450SL
There have been a few posts concerning the fail safe mode of A/C after a low coolant condition, but I do not have them bookmarked. A search on "low coolant" may get them for you. As I recall, however, this mode must be reset by the dealer or an independent trained in Mercedes systems. It is not something the owner can reset.
