I plan on adding a manual block off valve on the feed line to my heater core to help get the cab temps down a little more. It has worked well on my other trucks. Looking at the two hoses from the front of the truck, which one is the feed and which is the return?

 

Do like what they do on semi tractors, put valves on both hoses.

 

I may do the other side at another time. Just saving a few bucks.

For those that want to do this as well, the brass ball valves and 3/4" barb fittings will run you about $18. I use a metal 3/4" valve from the PEX line section of Lowes or Homedepot.....$9.

Yes, I am a cheap bastard!!



Done in 5 mins

 

what he said

 

Well if you have a laser temp meter you can start it, run it with the fan on and one side should be hotter than the other, inlet vs return. Or just by two valves and do them both.

 

any problems with letting the fluid sit in the heater core for a few months without circulation?

hotwheel - how's it working for you?

 

The whole reasoning behind the always circulating heater circuit is to prevent sediment plugging that was so common on the old systems where temperature was controlled by a valve in the heater line under the hood.
I would install two valves or at least open it up to flush every once in a while.

 

Thanks, I have opened it up every oil change in the past. So far the one valve is working well, but I will install one on the other line soon.