88 supra turbo overheating problems Help!!!!

[87hilux7mge]

sounds like the water pump has a hole in the housing somewhere and is recirculating water through itself at idle, but cant flow enough under load or higher rpms.

might be a bhg, but im leaning towards a wp. had the same problem on my buddies dodge dakota 5.2. would idle all day long, but put it on the freeway, itd over heat in 2 min. 1/2 inch hole in the pump housing...gaudamnit..

but like said, do a compression test. check for any coolant hose leaks (small hole can suck air in instead of leaking).