09 Prostar running hot

[Brock]

I don't know how you determined the radiator is clean? Did you remove it and spray it out?

Mine was starting to get hot and my mechanic kept telling me to take it apart and spray it out, I looked inside and it was clean, It was clean at the front too (or so I thought)

When I finally took it off the truck and sprayed it out, I found that when spraying the front at the truck wash, all I was doing wash pushing the bugs and crap from the ac condenser into the rad. Made a huge difference.

Especially a farm truck, that blowing crop dust plugs you up real bad! Also plugs the air filter very quickly. If the air filter is plugged, you'll get hot.