CLK430 AC Compressor on but no cold air. Codes incl.
Thread Starter
Member
Joined: Feb 2008
Posts: 224
Likes: 24
1987 Porsche 928 S4, 2009 Mercedes E350, 2011 Mercedes GL450, 2003 Mercedes ML350
CLK430 AC Compressor on but no cold air. Codes incl.
Hi, I have a 1999 CLK430 that is blowing hot air. I attempted to recharge the r134. Current temperature outside is 74F, and AC gauge can pressure shows just over 50psi. I see the compressor turning, EC button off, and both sides set to LO. No cold air.
I pulled the codes below, but I suspect something is going on with the refrigerant pressure switch (node 7):
1.....95
2....72
3....127
4....121
5....85
6....163
7....3 (this is very low to me)
8....91
9....-22
10....0.9
20....0
21....6
22....0
23....0
24....14.4 (voltage with engine on)
40....8
41....5
42....200
43....14
Any ideas what is making it blow hot despite a fully charged AC?
I pulled the codes below, but I suspect something is going on with the refrigerant pressure switch (node 7):
1.....95
2....72
3....127
4....121
5....85
6....163
7....3 (this is very low to me)
8....91
9....-22
10....0.9
20....0
21....6
22....0
23....0
24....14.4 (voltage with engine on)
40....8
41....5
42....200
43....14
Any ideas what is making it blow hot despite a fully charged AC?
Member
Joined: Jun 2024
Posts: 118
Likes: 22
From: Midwest
CLK 430
That #7 pressure does look low. When I recharged the AC on my 2002 CLK430 it took 3 - 12oz cans to get it going again. Then I had to do the “reset” procedure and it worked.
https://ww2-secure.justanswer.com/uploads/eurotec/2011-03-25_020013_air_conditioning_fault_codes_w208.pdf?_g l=1*1i2fzev*_gcl_au*MTA3NTE0MzUzNi4xNzE4NTUxODE2*_ ga*OTM1ODc4NzQ5LjE3MTg1NTE4MTY.*_ga_YVR58N9NM0*MTc xODU1MTgxNi4xLjEuMTcxODU1MjIzOS40MS4wLjA.
https://ww2-secure.justanswer.com/uploads/eurotec/2011-03-25_020013_air_conditioning_fault_codes_w208.pdf?_g l=1*1i2fzev*_gcl_au*MTA3NTE0MzUzNi4xNzE4NTUxODE2*_ ga*OTM1ODc4NzQ5LjE3MTg1NTE4MTY.*_ga_YVR58N9NM0*MTc xODU1MTgxNi4xLjEuMTcxODU1MjIzOS40MS4wLjA.
Last edited by andy_breuer; Jun 16, 2024 at 11:38 AM.
MBWorld Fanatic!
Joined: Nov 2001
Posts: 1,258
Likes: 209
From: Boston North Shore
2001 CLK320 Cabrio
I posted the instructions for retrieving and erasing the W208/A208 HVAC DTCs, directly from the N22 push button control module, in post #5 in the below link.
https://mbworld.org/forums/clk-class...-less-hot.html
