my work place owns a 2005 mercedes 316 cdi van, it has this problem with starting sometimes when cold. when the key is turned to start poisson all the dummy lights come on like they should but the a/c fan turns on. and if the fan turns on the van will not start. If the fan comes on, the glow plug light remains on. If I put an electric heater in the cab for some time (depending on ambient temperature) I will turn the key on, after a few seconds the glow plug light goes out and the sprinter starts normally; but after the van sits after a night it will do the same thing. does this make sense to any one. is there some type of sensor for the glow plugs or a/c fan sending the wrong temp to the glow or a/c to cool or ???? When it acts up, I get a P1482, P1610 and P2134 codes.(2 glow plug, 1 engine control relay) I put in a known good engine control relay with no change. any ideas

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81 300td wagon
79 vw rabbit diesel
99 f250 diesel
00 vw beetle
73 MGB GT

1.Try turning off the HVAC fan switch.(If it's already OFF your have a Short)
2.A Relay(s) that has to be "Heated" to work properly "Ain't Right".

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'84 300SD sold
124.128

where is the hvac fan switch? also when the cab is heated with a electric heater the van will start is there a temp sender in the cab somewhere that could be falty. if the cab is heated the fan will not turn and it will start. if i dont heat the cab the a/c fan turns on and it will not start. please help me thanks

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81 300td wagon
79 vw rabbit diesel
99 f250 diesel
00 vw beetle
73 MGB GT