My international truck heater switch is long gone. I need a switch that reverses the heater motor. Forward for heat. Reverse for defrost. That's how these type work and I been told the 42-48 Fords were the same..anyone with such a model and what do you use for a heater fan switch? Currently I am using a switch that only gives me heat,,and plenty of it but I have no defrost option...
a three position toggle switch with 2 sets of contacts should work, if your fan is a two wire simply reversing the leads with change the fan direction being dc current
ford would be + ground them years get a shot of the fan if you get a chance im just interested on how they angled the blades . Normally proformance suffers quite a bit in the reverse direction. It would be easy enough to run a normal fan control and just switch direction with a relay.As far as positive ground systems go the only experiance Iv had with them is to trouble shoot them with a pair of side cutters. I met Joseph Lucas in my teens , shame if he would of made guns wars would not start.
this below is an explanation of how the heater works,,from someone better informed than myself. The motor itself only had 2 wires,,It was the switch that was designed by NASA no doubt
The heater is two speed, reverseing. There is a paddle fan near the core, and a squerll cage fan futher back. On the direct side, it pulls are from the rear and blows it thru the heater core, on indirect is draws air thru the core, and discharges it out the back of the heater. The defroster is fed off the squrrell cage (which blows the same.. from inside to outside of the cage, regardless of which direction the motor turns). When on indirect it gets the hottest air, as the paddle fan is drawing thru the core and dischargeing at the back where the defroster blower is, The de frost still works on "direct" but the air supplied is cooler, as it is the returning air from the cabin. Hopefully you marked how all the wires were connected before you dis assembled.
-- Edited by Jazz on Monday 11th of February 2013 03:46:12 PM
