heater question

[greasemonkey71]

ok i figured out that the heater fan turns on and works ok

but the heater hoses to the motor are not hooked up right

can someone get me a diagram of how the hoses are connected

im driving the truck half ways to colorado on monday and i would really love to have some heat source driving through utah

[danleaman]

On my 72 (ac/cab) 5/8 hose is intake and goes to the manifold. 3/4 is is return and goes to the radiator or if there is no nipple on the radiator it goes to the water pump. Just put a new radiator in mine and had to install a 3/4 in nipple in the water pump. If I had a picture I would post.

Hope this helps.

Dan

[JimKshortstep4x4]

Here is a diagram of the heater hose routings for the different engines.

Jim

[Longhorn Man]

are they disconnected, or not routed right?

[greasemonkey71]

the actual heater itself is connected to itself nothing is routed correctly

[ChevLoRay]

So, you're saying that one of the hoses is routed from one connection on the core, back to the other connector on the core? If so, it could be that the core is leaking and the P.O. didn't want to replace it. Your problem may be beyond simply hooking up some hoses and mean a replacement heater core is in your near future if you want heat this winter.

[greasemonkey71]

well from what he told me he just never needed it so he disconnected it

if the heater core is shot how much does one cost cost? where can i get one?

how hard is it it to replace?

[mrein3]

Originally Posted by greasemonkey71

well from what he told me he just never needed it so he disconnected it

if the heater core is shot how much does one cost cost? where can i get one?

how hard is it it to replace?

I would hook it up before I replaced it. Heater cores are $35-$45 but can be a bear to swap out.

On a truck with AC the heater is hidden in a box behind the glove box. You need to remove the glove box and remove the heater core box. It sounds easy but some of the fasteners under the hood are a bear to get at.

If it the PO truly disconnected it because he didn't use it you should be ok but I suspect he unhooked it because it was leaking.

[greasemonkey71]

yeah i dont have a glove box

i was actually go to brothers and get a glove box and an ashtray and maybe a cup holder

[dznucks]

If you plumb the lines and find out the heater core is leaking, you can use a piece of pipe (like a piece of 1/2" ID galvanized steel pipe) to union the two heater hoses together while you replace the heater core......assuming its a daily driver and you need the truck.

[greasemonkey71]

its an almost daily...drive it 2-3 days a week to work

but im deploying in a month and im drving it home and leaving it there for the next 7-8 months

[swamp rat]

If your gonna hook up the core unhook it from one end then blow thru the hose to make sure the core is not plugged up before hooking it up.

Jimkshortstep4x4 Thanks for posting that page!!

[slikside]

I have a '72 SWB 350 w/ auto transmission and mine WAS hooked up like JimK's photo for the the 350 with the manual tranny...and worked well that way. But just the other day, while getting my carb dialed in after a rebuild, I walked around to the passenger side and a bunch of coolant was puddling on the ground. Traced it back from behind the heater box...core leaking.

I think you should blow it out and hook it up and see, but be prepared for it to leak. I can't imagine why someone would go through the trouble of disconnecting a perfectly good heater if it wasn't leaking...even if they didn't us it much.

I simply took the hose from the water pump off of the core, cut it to fit, and reattatched it to the intake manifold....yes a 3/4 hose onto a 5/8 fitting. tightened it up well, ran it and drove it......no leaks, no cooling issues.