truck heater

I have put in a few but that was back in the mid and late 70s. Logically you want to put it in so the flow goes in the same direction. Therefore it should go from the pump outlet to the heater or from the heater to the pump inlet. Since the object is to heat the engine block, I would put it in the return line. Make sure the coolant valve on the heater stays open when you stop. Another consideration is where the lines run. If one line is easier to get at where you can find space so it doesn't hit plug wires etc thats where I would put it.

Try this,

That is what ive been looking for right there i knew there was some way of doing it . My only problem is i have it hooked up that way and now the heat in my cab dosent get real warm. Im thinking of just sayong hell w/ it and going back to letting it warm up for 30 or 40 mins. every morn lol. And yes its a 1500w not 1500kw wow now that would be a heck of a light bill. Thanks everone for there help.