I am to the point in my build where I am routing heater hoses and have a question about which host connects to which port on the heater core. I have 1 hose coming from the thermostat body and one hose coming from the water pump. Can't see that it would matter but thought I would ask. So, does it matter? I have pics from when I took the hoses off but, of course, the heater core end is blocked by the battery.
Also, I have seen mention of the intake manifold being involved. It is (was) not with mine - is that a thing and the PO just bypassed it? Diagrams online seem to be hard to come by and my manuals don't show it.
Thanks in advance for your time. Pics of your setups would be even better.
coolant goes from the thermostat housing to the water port on top of the front of the intake manifold. then the water runs through the intake manifold to the rear of the intake. from there it goes from the rear port of the intake to the heater core. then through the heater core to the other port of the heater core to the water pump. i just ordered some straight fittings,hoses with a 90 degree bend in them, and aftermarket springs that goes over the hose to put a bend in it and the hose wont collapse. unfortunately the fittings are straight so that is where the hose with a 90 degree bend will hook to the fitting. then the spring is for the other end where i also need a 90 degree bend at the heater core and about a 120 degree bend at the thermostat housing.
I also have a 1980 with a 258. I attached a picture of my setup. Just hoses going from the water pump and thermostat housing to the heater core. Water pump to top heater core port and thermostat housing to bottom heater core port. No connections to the intake manifold. However, I am not running the stock intake manifold. I have a “Torker II” intake manifold. This is how it was for decades. It is the only picture I could find.
I remember looking into this same question a few years ago to see if it mattered which hose went to the top and bottom heater core ports. I looked at a bunch of CJ engines in google images to get my answer. Lots of pictures with hoses going to the heater core.
Currently I am running a bypass and my heater core is plugged. It started leaking on the floor and I never use it because I only drive my Jeep in the summer with no door or top. So, I cannot go look at it. That picture is the best that I have.
Thanks guys. I will route the way andys shows and adjust later if it seems to make any difference. There are no ports on my intake manifold but didn't know if PO swapped that out also. This is a frankentruck to be sure.
AMC switched from cast iron to water and electric heated aluminum intake manifolds in late '80s, IIRC. There was no coolant connection on the old cast iron style manifold.
Matt
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