1980 4x4 heater mystery? (help)

[69800]

I just got an 80 4x4. Everything is working except there is very litte heat. I traced down the cable from the dash. I runs behind the heater core and is just sitting there with a nice little factory loop in the end ready to be hooked back up to the heat control valve, but I will be darned if I can not find the valve. The steel heater tubes coming down from the firewall inside look to be factory. I have use a mirror to look behind the heat exchanger and cannot find a heat shutoff valve anywhere.
Does any body recall where it is? I was trying not to have to pull the whole heater out of the truck to find it.
Thanks in advance
Mark

[fourwd1]

The valve should be on the firewall in the engine compartment, follow the heater hoses.

[mudwiser316]

I was having issues with my 4runner not getting any heat. I found that the heat valve control cable was broken which was one issue. The other issue was the radiator cap was bad which lead to the heater core not getting enough flow to heat the truck. Well I figured I would just put out some info.

[fourwd1]

The heat valve also can seize up and not move.