Vehicle & Technical > Discovery

now this is a wierd problem. Must be a 1st?

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lrmike:
That's the bit that I'm not sure of either, but if the switch has suffered a meltdown of some sort, then any live circuit in it may keep the fan on.  Hi blower runs straight through the switch, no resistors.  The fact that it will shut off when you turn the fan down makes me think there is an issue in the switch.
You do (or did) have the problem with the Hi fan cutting out, right?

muddyjames:
fan cuts out when on speed 4 and on max heat. if i turn either speed or temp down it doesnt cut out.

lrmike:
The switch is the culprit.
If you have a truck with dual A/C (I know, not too popular in the UK) the rear switch in the overhead is the same as the front switch in the dash, BTW.

muddyjames:
I only have A/C that doesnt work and bits taken off it like idler pully, no gas etc. no over head A/C.

surely the fan should shut off with the ignition?

lrmike:
Maybe not if a live circuit in the switch is melted over to the fan circuit.
I may well be wrong - as is sometimes the case  :roll:  but since we know the switch is no good because it cuts out, it seems the easiest place to go.
I'll try and check a circuit diagram when I get a chance (after work) and see if there may be something else, too.

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