It's most likely from the thermostat housing as it's common to leak there. I used thread sealer on the sensors and rtv plus a CORK gasket (it's thicker) on the thermostat housing

 

Rtv on the cork gasket? Is it common to leak where the sensors are?

 

I'll have to track down a cork one. This one was like a stick on style

 

Verify where the leak is coming from first. You *should* need to use anything on the threads...... Most that I have seen, if they are not dependent on contact with the manifold for their ground, they already have some thread sealer on them, right out of the box. If it IS leaking around the sensor, just tighten it up a bit more.

And yeah, the thermostat housing is notorious for being difficult to seal......

 

Ok ya after work I'll try to tighten them a bit more. Maybe I should find correct torque specs for thermostat housing
the last gasket that was on here looks like same material as one I have on now and didnt have any leaks beforehand .

 

That was supposed to be *shouldn't*....... Darn keyboard.

I usually put a think coat of RTV on both sides of the thermostat gasket......

 

Ok ya. Looks like I'm tearing it off again. It's hard to tell where its leaking when there all so close together lol

 

Pull the a/c compressor out of the way, makes seeing in there much easier. Also lets you look at the bypass hose. (notorious for 'mystery' coolant leaks. )

 

I forgot about grounding to the case, so thread sealer would be a bad idea! As HeyYou said verify where the leak is first

 

Years back, an old dinosaur mechanic told me to stop using "any kind of sealer" on the thermostat gasket. Use the plain paper style gasket with no sealer. The paper gasket swells from the antifrz encroachment and it swells up n, voila! I've been doing it on these stupid mopar thermostat housings for 3 decades now. No leaks. Just don't over torque your bolts and crush the gasket.