Boat info:
1990 Supra comp with pcm ford 351
Symptoms: runs great but after running if you turn ot off to sit for a while when re started it will overheat. If you rev it in neutral it cools off. Also last time out temp would creep up after slowing down. Would run 175 for 45 min straight then when slowing down temp would go up to 185-190. If you stop and rev in neutral it cools off.
Replaced impeller and gaskets I’m early spring. Old impeller was missing fins. Inspected thermostat housing and water pump housing for fins and found one tiny piece.
Was told to check trans cooler. Pulled off trans cooler and there was some debris. One hole was completely clogged. Cleared the blockage. In the process I spilled out a lot of trans oil. I’m wondering now that it’s hooked back up do I need to add more trans fluid? Do I need to flush the trans fluid in case water got in the oil inlet hole when I was flushing the main water passage.
Pulled thermostat housing and it is good. Thinking about trying a 145 instead of a 160 and replacing thermostat.
Noticed a lot of rust near the block where water hoses are behind pulleys (pic included)
I cannot get a mechanic to look at it or I wouldn’t be doing this. Any help is greatly appreciated! Could one clogged hole in the trans cooler really make that much difference
Can’t get pics to upload here’s links to video
https://youtu.be/qjcGeA-84_U
Trans cooler
https://youtu.be/53ScpqhVhR4