A/C Brainteaser- Does it need a Star to reset?

phill993 · 09-03-2010, 04:11 PM

Just had A/C regassed after replacement of a damaged condenser/dryer. The system holds pressure at 0.95g as per the spec and shows no signs of leaks. HOWEVER, A/C button light is off, when button is pressed the light flashes 3 or 4 times then goes out and A/C doesn't operate. (Though it is difficult to tell in this weather!)

The handbook says that on this car (W211 Estate late 2007 facelift model) the A/C button light is illuminated when the A/C is running / Off when not running and flashes if there is a loss of gas pressure.

The guy who regassed the system was totally bemused and after a long while checking the entire system with a sniffer and ultraviolet lamp, rang one of his mates for advice. This guy told him that the Merc A/C system needs to be dealer RESET (presumably with the STAR) after loosing gas pressure completely.

Does anyone here with a knowledge of the STAR system know if the A/C does need to be reset after being worked on? If so, is it posible to reset without the STAR? I have checked the codes using an Autel EU702 reader and the car is showing a completely clear code bank.

As the gas pressure is holding up, does anyone have any other faut finding suggestions/ideas/techniques?

BlackC55 · 09-03-2010, 04:53 PM

Yes, it will need the fault memory erasing with a Star

phill993 · 09-03-2010, 04:59 PM

Quote:

Originally Posted by BlackC55

Yes, it will need the fault memory erasing with a Star

Any ideas as to why it doesnt show up as a fault on the Autel Fault code reader?

09-03-2010, 04:11 PM	#1
phill993 New Member Join Date: Jan 2010 Location: Cambs Car: E320CDi Estate/BMW 525i Touring/Porsche 993 Posts: 23	A/C Brainteaser- Does it need a Star to reset? Just had A/C regassed after replacement of a damaged condenser/dryer. The system holds pressure at 0.95g as per the spec and shows no signs of leaks. HOWEVER, A/C button light is off, when button is pressed the light flashes 3 or 4 times then goes out and A/C doesn't operate. (Though it is difficult to tell in this weather!) The handbook says that on this car (W211 Estate late 2007 facelift model) the A/C button light is illuminated when the A/C is running / Off when not running and flashes if there is a loss of gas pressure. The guy who regassed the system was totally bemused and after a long while checking the entire system with a sniffer and ultraviolet lamp, rang one of his mates for advice. This guy told him that the Merc A/C system needs to be dealer RESET (presumably with the STAR) after loosing gas pressure completely. Does anyone here with a knowledge of the STAR system know if the A/C does need to be reset after being worked on? If so, is it posible to reset without the STAR? I have checked the codes using an Autel EU702 reader and the car is showing a completely clear code bank. As the gas pressure is holding up, does anyone have any other faut finding suggestions/ideas/techniques? __________________ So many questions .... Now: W211 E320CDI Estate Previously: R CLass, CLS, W210

09-03-2010, 04:53 PM	#2
BlackC55 Hardcore MB Enthusiast Join Date: Feb 2007 Location: Horndean, Portsmouth, Hampshire, Southsea Car: C43 AMG with mods, ML270, Mk1 Golf cab. Mk1 Caddy fully restored 7.5T truck Rotax Max race Kart ETC Posts: 8,251	Yes, it will need the fault memory erasing with a Star __________________ Prestige car Service: I am listed here on MBClub please click to see services and discounts available.

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