loud clonk (relay ?) behind dash on start

blink10

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hi people on start up (C270) there is a loud clicking may be a relay or air switch lasts about 30 seconds from behind center dash (radio area) could it be air con? many thanks. BLINK
 

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blink10

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Hi yes it is a 2002 c270 saloon the loud clicking is still there (30 seconds) but today the right hand heater control on the panel (air direction) will not allow air flow to the foot wells it just shuts down all air flow (you can hear the air struggling to get out of the system) the air flow is fine in the three other positions any ideas?many thanks. martin
 
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