heater core hose configuration?

[solomaxhd]

i have a problem, when i bought my 76 bronco with a 302, the hose coming off of the heater core to the heater control valve (which is connected to that heater core hose) had no hose coming off of it. the other heater core hose was cut in half, and the water outlet on the water pump was blocked off with a bolt and hose clamp. so, i need to know which hose off of the heater core goes to where, and what tpe of hose set up comes off of the heater control valve. thanks guys.

 

[Seabronc]

It actually doesn't matter which hose goes to which heater core ******. I just added that control to my FSB and ran the hose from the water pump to the control valve and then to one side of the heater core. The other side of the heater core goes directly to the return ****** located just behind the water neck.

FSBs don't have that valve, they just use a flapper door to keep the heat out of the cab, which still allows some heated air into the cab. OK, if you have A/C to overpower it, but I don't and that valve works great by cutting off the water flow.

Good luck,

>-

 

[Bully Bob]

I can add.., if you didn't already., you might want to test that heater core for leaks.

Guessing that may be the reason the PO by-passed it.

Be a shame to get it all set-up .... only to have to drain & start over.

(they're cheap & pretty easy to change)

 

[solomaxhd]

thanks guys, what threw me off was that behind the wateroutlet was a vauum fitting of some sort.?

 

[Seabronc]

That is a temperature operated vacuum switch which is associated with emissions control.

Good luck,

>-

 

[solomaxhd]

That is a temperature operated vacuum switch which is associated with emissions control.
Good luck,

>-

is that temperature operated vacuum switch neccessary to have or can i eliminate it so i can put a hose fitting there so i can have heat this winter.?

 

[Seabronc]

The hose connection should already be there on a 302 intake manifold. Can you post a picture of that area.

>-

 

[Seabronc]

A quick question, if the loop is actually needed for proper operation, why did the older 302s and 351s have a inline heat control valve that shut off the flow?

>-

 

[Seabronc]

Because they didn't have TVVs & ECTs & other stuff dependent on that circuit for engine & emissions management. And because the designers didn't have as complete an understanding of what was going on as we do today. Remember they didn't have finite-element analysis, CAD/M, strain gauges, or even non-contact thermometers when those engines were conceived. /emoticons/[email protected] 2x" width="20" height="20" /> It had only been a few decades since gasoline was considered a nuisance waste byproduct that was dumped into rivers. We've come a long way since then... /emoticons/[email protected] 2x" width="20" height="20" />

I guess. Those guys back in the 60s and 70s were virtually cave men :blink: , it's a wonder those engines still run

>-

 

[RG75BRONCO]

Does anyone have any experience with relocating the heater control valve for E.B.'s? I have a 75 and I am looking for a better way of securing it under the hood so that I can keep it off of the intake and rocker arm cover. Thanks

 

[TX '73]

Does anyone have any experience with relocating the heater control valve for E.B.'s? I have a 75 and I am looking for a better way of securing it under the hood so that I can keep it off of the intake and rocker arm cover. Thanks

I think the best place is stock location. You may need to engineer or fab something to hold it away from moving or hot parts... My 2 cents.

 

[riggermortis]

just my 2 cents, if you want it to function better than stock once you get the water hooked back up, i wrote a article in the "how to tech articles and reviews" titled "early bronco heater upgrade" that shows how to install a blower from a early 90's truck into the EB heater box. it produces twice as much hot airflow than the stock setup.

 

[RG75BRONCO]

just my 2 cents, if you want it to function better than stock once you get the water hooked back up, i wrote a article in the "how to tech articles and reviews" titled "early bronco heater upgrade" that shows how to install a blower from a early 90's truck into the EB heater box. it produces twice as much hot airflow than the stock setup.

Where was the stock location? Was this valve mounted in some way to the intake manifold or to the firewall? When I purchased the vehilce it was free floating hooked to the control cable and heater hose and slapping against the rocker arm cover. By the way is the electronic device mounted next to the starter relay on the wheel well the instrument cluster regulator? Does this ensure the gauges function properly? Thanks for your help.

 

[Bully Bob]

"By the way is the electronic device mounted next to the starter relay on the wheel well the instrument cluster regulator? Does this ensure the gauges function properly?"

---No the regulator you speak of is small & attached to the back of the cluster.

It (volt. drops) to 5-6 volts, with a pulsing action.

 

[RG75BRONCO]

"By the way is the electronic device mounted next to the starter relay on the wheel well the instrument cluster regulator? Does this ensure the gauges function properly?"

---No the regulator you speak of is small & attached to the back of the cluster.

It (volt. drops) to 5-6 volts, with a pulsing action.

Thanks for the info. Could this electronic device be related to the horn? I pulled the motor a couple of months ago and remember removing the device which is probably 2 x 2 with a three prong wiring harness attached from the firewall so the area could be painted but misplaced it in my garage. I have a Chilton and a Haynes manual but they do not reference what this may be. A picture of it is attached (left of the starter relay). Thanks, RG

Doc1.doc

 

[Bully Bob]

I could only guess that's an aftermarket relay for an "add-on" accessory.

 

[RG75BRONCO]

I could only guess that's an aftermarket relay for an "add-on" accessory.

I was able to determine this part is the horn relay swith.