I'm considering doing a Webasto install on an 08 3500 with the 6.7 in it... I'm wondering if anyone knows off hand where I'd find a frost plug in the block, and the head. Need a supply line from the block, and a return to the head.

Thanks, Chad.

 

The 6.7L does not have a frost plug. It uses a grid heater which is pretty much like the elements on a toaster, surrounding the block much as a piece of bread is surrounded by the elements of a toaster. When it gets cold out, the grid heater cycles on and off. This is what causes the lights to dim and the voltmeter to fluctuate.

 

definition of frost plug... "frost plug AKA freeze plug" are plugs that are used during casting the engine block and head to remove casting sand and have nothing to do with frost or freezing..........the most common location would be in the block under the exhaust manifold and on the other side.on the head, I've seen them on either end. but i don't think you could use thosethere are some pipe plugs on the passenger side that could be used (3/8s or 1/2)

 

I always thought they would pop out before the block froze and broke if the antifreeze was bad. Never seen an engine without them.

 

they may pop out but don't count on it, i've seen blocks crack on both sides of the plug and still push the plug out.

 

I would just install the Webasto inline with the heater circuit to circulate the water there. Thats where the Espar is detailed to be installed and did that with my 97. No need to tap the block at all.

 

Inline with the heater circuit, doesn't the heater core valves have to be open then? Like, within the truck would you not have to have your heat cranked up to allow flow through the heater core?

 

i think it will flow thru the head rather than the heater

 

Core valves? You give Dodge too much credit..LOL.. There is always coolant flowing through the heater core, especially the 6.7 with the EGR cooler in the circuit.

I have it installed that way on my 97 and it flows from the Espar into the heater core, out to the block and down through the inlet to the block at the pump and out the top heater tube back through the Espar. During normal engine run, the fluid is flowing through the espar at all times.

 

Well then.... Block - Webasto - Heater Core - Block? I'm having a difficult time trying to figure out what you mean. Would it make a difference if it's got the dual climate control? Which is the heater core inlet/outlet?

 

Its hard to explain in words...
This tiny picture is from the espar site..

The heater hose coming from the engine to the heat core - Webasto - core . The return line from the heater core goes right back to the block.

I have a picture of my 97 install. The elbow is the connection from the Espar heater to the core and the other connection is the feed from the block.

 

Makes no difference. The coolant flows through the heater core at all times, no valves, nothing, unless you have installed a valve.