It could be the radiator also.. I had this same problem last year and it would overheat when going up the passes or getting on it hard...I was concerned because this was with a rebuilt engine. Now almost one year later no problems.

HTH
Jeff S.


It's all good!
83 Shortbed stepside lots of mods
82 Shortbed fully restored
85 Shortbed daily driver
88 4-runner-Wife's daily driver