Ok so I am in a bind as I just fixed the truck and now it is overheating.

4.0 99 ford ranger 150k

It was leaking at the thermostat gasket.

I just took it off, cleaned, sealed with RVT sealer let sit 20 hours, filled with fluid and bam overheating.

Top hose has no fluid in it. I am guessing thermostat is stuck closed. I am not sure though.

I am picking up a new thermo right now, but I have to fix this tonight.

any suggestions would be great

Thanks in advance.

 

Thanks for the posts on V6~4.0L~SOHC engines & TStat housings; good reference info.
Replaced the old leaking FRPlastic TStat Housing with a new Aluminum TStat Housing
in 2019Aug on a 2001 Ford ExSportTrac; no leaks as of 2020Mar after ~5K more miles.
My full write up with pics on that repair:
http://2001fordexplorersporttrac.fandom.com/Coolant_ThermoStat_Housing