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Old 03-02-2024, 10:38 PM   #1
bluec10
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Join Date: Apr 2002
Location: Manitoba, Canada
Posts: 663
Question L6 - 250 Overheating

Stuck with the 250 till the 383 is done.

Have lots of trouble with overheating. Put in a bigger rad, tightened all the clamps, bigger fan, new cap, new thermostat, and rad is full.

Have to keep the truck at 90 km/h (55 mph) ot it will overheat. In summer, of course.

The L6 is a long engine and the temp sensor is at the back - far from the water pump. Is this part of the problem, or is it really prone to overheating?
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Present:
2015 Tacoma. Yeah, not a GM, but I love it.
1969 GMC 32,000 - fix, drive, relax, fix...
2019 BMW R1250 GSA - Yahoooooooo
1979 Honda GL 1000 - retro touring at its best.

Past:
'05 Sierra 4x4 - Had 270,000 KM and running well when it was written-off by a stop sign runner.
'94 F-150 from the "F word" company. I'll admit it...good truck. Sold what was left of it for $800 to a guy who came to pick it up at 11:00 PM with cash in hand. Hmm.
'79 Sierra Grande (Black) organ donor - perfect rebuildable 4-bolt 350 and a good TH350.
'76 Sierra Grande (Orange) - hate isn't too strong a word. Kid who bought it turned it into a hot rod.
'68 C-10 R.I.P. - Dad's old truck...too far gone to resurrect.
'59 C-50 - with hoist. Truck is gone, wife isn't. Nuff said.
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