Mechanics

HEAT- A/C BLOWER WON'T EVER SHUT

2001 Mercedes Benz CLK320

Electrical problem
2001 Mercedes Benz CLK320 6 cyl Two Wheel Drive Automatic 113000 miles

Reguardless if the ignition is on or off the blower for heat and a/c is always blowing on hi. Could issue be related to water leak at base of windshield on passenger side. What is the most likely cause? I'm a licenced mechanic but I'm not familiar with Mercedes (mine, not a customers) I'm generaly a gm and ford guy.
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M245138
May 31, 2010.



Could be caused by faulty fan relay module, 2 of them, both in driver side fuse & relay module box (at left rear corner of engine compartment)

Bluelightnin6
May 31, 2010.
Thanks, I'll let you know if or when I manage to find the problem. Haven't had time yet and it's going to rain all day today.

Tiny
M245138
Jun 1, 2010.