schadelh

So, I was trying to get at my #5 sparkplug, touched (just freaking touched it!) the heater core line to get a view of the plug and BAM! the plastic valve looking thing that the heater core lines go to blew up and sprayed me with boiling hot coolant. It looks like a proportioning valve (2 lines to/from pump, 2 lines to/from core, and a vac pot)...

Can I just plug the lines coming from the pump until next week when I can get a new part, or do I have to wake up extra early tomorow to bike to the parts store/dealership to get a new one?

xjchase

I just took mine out and plugged the vac line. That was 2 winters ago.

Slick761

Bypass. As in hook the two lines together.

schadelh

here is a picture of it

djb383

The factory eliminated the heater control valve '97 up. Vacuum line needs to be capped.

schadelh

Can I just plug the existing hoses straight into the heater core, or will I be miserably hot tomorow?

edit: what size hose (ID) is that? time to get a bypass

djb383

On a '98, hose from t-stat cover is 3/4", hose to water pump is 5/8".

OverlandZJ

Loop one of the heater hoses from the waterpump back to the thermostat housing.. bypassing the heater core. You wont have heat till you replace the valve.

Be carefull not to kink the hose and stop flow though.

DFlintstone

Yes, the loop works.

Slick761

"Loop" lol :-)

briansgarage

I bypassed the heater core on my wifes car last year until I had the spare time to remove her dash to get to it..
We ran it all summer like that without issue.. Jeep may be different I don't know, but our Ford did fine all summer..

montanaman

You can push a 5/8" hose onto a 3/4" fitting, unless it's one of those super hoses. I would hook the water pump directly to the t-stat cover until he can get a new valve.

schadelh

I got a 5/8" coupler and coupled the hoses together, then ziptied them to the old heater core valve so they wouldn't flop around much since I had to take them out of their bracket to keep them from kinking... the top hose looks like it is flatening out a bit due to the bend, but it isn't kinked. Would that be a problem?

djb383

Doubt it'll be flat once pressure starts to build.

montanaman

Somebody correct me if I'm wrong, but I don't think that would be a problem. Remember ... this is just a "bypass" loop. If coolant doesn't flow through the flattened hose, then more of it will flow through the radiator.