Originally Posted by fixit1958
Does this mean that this is an original ARK LES switch for Chevrolet supplied to GM, or is this an aftermarket ARK LES switch made specifically for Chevrolet?
Tim
If you mean, is this the switch used by GM that was installed on Chevrolet trucks.
According to Brad Allen, in the above POST. ....No
Original switches were Delco-Remy or Cole-Hersee
ARK LES heater switches were a replacement aftermarket switch made for the Chevrolet truck heaters .

The thing is the Fresh Air & Recirculating heaters, I thought, were accessories, that were sold & installed by the Chevrolet dealer.
Which raises another question, could you order a factory installed heater when buying a new truck from a Chevrolet dealer?

If the dealer installed the heaters, where were they getting the heaters from?
If this is the case, how would you know for sure who the manufacture of the switches were, that came with the heater boxes/kit?
I know that the heater boxes were manufactured by Harrison.
Maybe that's who the Chevrolet dealers were getting the heaters from.
Someone had to gather all the parts and put them in a cardboard box.

My hunch is if the heater was installed at the factory (if that was possible), a Delco-Remy or Cole-Hersee switch was used.
If the heater was installed by the Chevrolet dealer a ARC LES switch was used.

Who knows what the dealer was using, they just wanted to close the sale on the truck.