So ive got a 1999 hzj105 and there is no heater tap on the firewall as a few members have described above. Is there a difference in some models? My heater has stopped working and am trying to locate the tap . Whats the best way to get to it through the dash?
I can’t help you there, living in Romania, it’s a rare sight to see an 80 let alone a 105, so that’s reserved for you fortunate Aussies, where 105s are more aplenty.
But my 80 is an HZJ so at least the engine bit will / should be familiar. I’m always reluctant to post photos, because I’ve added a home-made heat exchanger to give me hot-wash wiper jets, and it might confuse folks.
Here goes anyway, if they’re of any assistance.
Basically, the single rubber hose coming from the RHS of the engine block (looking from the front) divides into 2, one going through the bulkhead for the underdash front heater core, the other is attached to a steel pipe that travels down the bulkhead, and under the floor to feed the rear heater core under the front passenger seat.
Likewise on the LHS of the engine block, the single rubber hose divides into 2 the same way.
On my 80, the on/off flow tap is mounted on the RHS, but as you say you don’t have this, I have no idea what controls the flow on your 105.
Here‘s some photos... for what they might be worth...
RHS engine, ignore the ribbed pipe (that’s cable sheathing) and the extreme right vertical rubber hose comes direct from the block and if you ignore my lagged copper pipe contraption, it would normally go direct to the tap. After the tap, on the left side, it curves back across to the right, then divides into 2, one going through the bulkhead for the front, the other going down to the rear heater. I’m repeating myself, aren’t I ....
Maybe easier to see on this next photo...
This is my heat exchanger contraption (that works very well in sub -20C winter here) so ignore that....
LHS very similar, but mirror image, but no tap. Again, the hose from the engine block is the vertical one coming up center photo. On this view, it’s easier to see where it divides into 2.... the rear hose curving down to its steel pipe that runs down the bulkhead and under the floor to the rear heater.
That’s it for the engine bay part of the circuit, I hope some of this makes sense. It’s very simple on mine, which is a ‘95/96 model, but yours being later might be electronically controlled.... I wouldn’t know.
BTW, the steel pipes are well known for rusting away, and the ones that go to the rear are the most vulnerable, and often the reason for being blanked off. I’ve seen some whee the steel pipes have been replaced with copper tube or long rubber hoses.
Best of luck....