Hello Master Wrenches, I could use some advice.
I have a 1981 Toyota pickup (with a heavy camper conversion on it) with a 22r and a 4 speed manual. I purchased it in October with about
120,000 miles on it.
The truck runs without a hiccup but the temperature gauge rises to about 80% when cruising at highway speeds for any length of time. It stays at an acceptable range in stop-and-go traffic and at 40-50 mph on rural byways.
I have already flushed the radiator -- it was a nice healthy green color with no observable rust or engine oil contamination. I have replaced the thermostat for good measure (hey, why not try the cheap 'n easy thing first!).
To no avail. The condition appears unchanged.
This morning I played around with the fan clutch. It turns pretty easily when I push on it, but it doesn't keep spinning after I take my hand away. A hot or cold engine doesn't seem to make any difference.
What does the gang think is the likely culprit here? Insufficient flow through the radiator, a failing fan clutch, or both?
Thanks in advance for your input!
Eric