skunker

I saw a photo of a thermostat on this forum where someone drilled holes* for the air to pass through.

I can't find it. Does anyone know what thread it was? Thanks.

*Is it really OK to do that technique?

Abovetimberline

If you would like a tstat housing with a hole in it just get a housing from a 91 and later,it has the temp switch already drilled in it. You can use the switch as a plug or put a plug in it. The housings are the same except the temp switch.

fantic238

Haha, i remember it, it was mine lol. Let me have a look in the threads.

caged

i think he is referring to a thermostat with a hole drilled in it, kinda like a jiggle valve, not a housing with a hole in it.

can't remember the post, but if you just go out and buy a thermostat with a jiggle valve, you could just remove the valve part and there would be a hole probably in the right spot?

fantic238

Well if it has a jiggle valve it is better than the hole.

fantic238

Ok, here is a thermostat valve with the jiggle valve:


The thermostat with holes is a normal thermostat where you drill holes where the jiggle valves are supposed to be.

fantic238

But not so many holes, lol..

caged

some thermostat housings don't have the bump for the jiggle valve, so a thermostat with a jiggle valve may not fit.

and a thermostat from the dealer with a jiggle valve is much better than one from a part store.

fantic238

I Agree.

4.3L XJ

That is right. You only want one small hole, otherwise your engine may pass enough coolant to not come up to operating temp in the winter. You would then have issues with low heat output in the heater and rich mixture when in stop and go traffic. The hole should be 1/16" or smaller.

cherokeesteve

Ford had a v6 I believe it was 2.8 or 2.6 liter with the thermostat down below on the lower radiator hose, and when you drained the cooling system it would get air in the system down at the thermostat causeing the thermostat to stay closed and overheat the engine, so we used to drill holes in the thermostat to bleed air out of the system.
Saw a guy do a valve job on one because he said it blew a head gasket!

99cherokeexj

I like the writing lol

skunker

That's it. Thanks!

I just pulled out my old 160F thermostat and I noticed it had a 'jiggle pin' inside where the thermostat was, rather than outside on the flange. Never seen it like that before. I don't know if it's stock, but there was a brand I think on it called MOTORad.

I bought a 195F thermostat and will drill 2 holes in that sucka at 1200 and 600. I have a closed coolant system (boo)