66' M35A2 in-cab heater/ coolant filter install

[RollingThunder19]

Recently just installed a heater in my deuce and put in a spin on filter for the coolant. First winter I'll have a heater in the truck and I'm excited to see how well it does. Also curious to see how well the coolant filter works and to see what it has filtered out once it needs a change.

 

[Modiconman]

Recently just installed a heater in my deuce and put in a spin on filter for the coolant. First winter I'll have a heater in the truck and I'm excited to see how well it does. Also curious to see how well the coolant filter works and to see what it has filtered out once it needs a change.

 

[Modiconman]

I'm not following your hose layout...it seems that the filter is in parallel with the heater core but still all of the flow goes through the filter....

 

[RollingThunder19]

I'm not following your hose layout...it seems that the filter is in parallel with the heater core but still all of the flow goes through the filter....

Yes I made it so that the flow goes through the filter and through the heater core during the winter and I have it set up so that the coolant flow can be shut off to the heater core with a ball valve during the summer and another valve opens up so it just bypasses the heater and just goes through the filter and back into the truck

 

[Modiconman]

Ahhh. I am having an issue with not enough heat, and I have the filter and heater core in series and folks here have suggested that the filter may be reducing the flow through the core........

 

[RollingThunder19]

Ahhh. I am having an issue with not enough heat, and I have the filter and heater core in series and folks here have suggested that the filter may be reducing the flow through the core........

If you're having an issue with heat look at this diagram this is how I have mine set up

 

[tommys2patrick]

Rolling Thunder 19--I assume you close both valves to remove the filter. But have you noticed any draining with your bypass line to the heater core/ filter when you remove the filter? seems like it would need a shutoff to prevent drain back from the water pump connection?

 

[Modiconman]

Rolling Thunder 19--I assume you close both valves to remove the filter. But have you noticed any draining with your bypass line to the heater core/ filter when you remove the filter? seems like it would need a shutoff to prevent drain back from the water pump connection?

I have not replaced the filter yet, as I only installed it a few "miles" ago, so I can't answer your question about the drain back.
I looked at your diagram. That's the way that I have mine installed, except i have a coolant filter too. I have it installed in series with the heater core. I am going to bypass the filter this weekend and see if the heater works. If so i will re-plumb my filter to a parallel configuration.

 

[RollingThunder19]

Rolling Thunder 19--I assume you close both valves to remove the filter. But have you noticed any draining with your bypass line to the heater core/ filter when you remove the filter? seems like it would need a shutoff to prevent drain back from the water pump connection?

At the top of the filter I actually have 3 valves. The 3rd valve can not be seen in the picture. 1 for heater core, 1 for heater bypass and 1 for the "IN" side for the filter. So I'm able to close all valves for no drain back when I change filters

 

[Modiconman]

I temporarily rerouted the hoses to bypass the coolant filter and the heater worked! I am now going to route the hoses so that the coolant filter is in parallel with the heater core.