heavy duty radiator

The way they stuff the radiator and CAC side by side in those things doesn't leave many options. Very poor design in my opinion.

 

I usually spray mine with good oven cleaner and rinse out with hose. Just cover chrome and paint with some plastic. Amazing all the junk that washes out.

 

i doubt that that old 4300 has a side by side setup. that was back when a truck was a truck!!

 

Yeah, I forgot about those, haven't seen one in years. I was thinking of a later 4300.

 

Dumb question, but have you already taken everything apart to make sure it is clean?
Bought my truck in Feb. 2010 from a guy who ran a hopper behind it. Ran it several trips a couple hundred miles from home to make sure everything worked OK after all the normal/obvious checks. Rolled out across New Mexico in April only to watch the water temp rise. Long story short, called the previous owner about it & that is when he told me they used to load ground calcium inside a building. Everything was plugged inside. Cleaning helped a bit & used the stuff the A/C guys use. Take it all a part as much as needed to make sure you can get to things properly. That lime packs in there like concrete with only a small amount of moisture.

 

Does the fan spin up good ? May need a fan clutch. Water pump and T-stats in good shape? Does the engine have good power or seem to be laboring hard to do the job?