Running hot Only while driving.

GBRAZIL · 12-08-2009, 05:03 PM

OK im a " new " 93 4runner owner 125k. truck was running cold and could never get it to warm up ( or shift into OD ) i had to drive the thing for about 20 min before temp would get half way. so i changed thermostat only to find that previous owner took out the old one and left it open . now car heats up fine at idel , but when i drive it gets hot , what Gives. PLEASE HELP

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myyota · 12-08-2009, 06:27 PM

Check the radiator, it could be plugged, maybe thats why the previous owner removed the thermostat because it was over heating.

yota8083 · 12-08-2009, 06:33 PM

overheating while running down the road = radiator stoped up. I bet one tank is hot to the touch and the other isnt. This means the coolant is not circulating through the radiator causing the overheating.

GBRAZIL · 12-08-2009, 07:50 PM

OK. sounds simple. but is it as simple as a draining it or a complete flush
Thanks for the help guys .

yota8083 · 12-09-2009, 07:57 AM

In this case I usually just replace the radiator. You could try flushing it first but I have found this usually doesnt fix the problem.

GBRAZIL · 12-09-2009, 04:51 PM

Well there you have it.. flush it and still gets hot when driving. guess its time to replace.

12-08-2009, 06:27 PM	#2 (permalink)
myyota Registered User Join Date: Oct 2006 Location: GrangeVille, Idaho Posts: 2,484	Check the radiator, it could be plugged, maybe thats why the previous owner removed the thermostat because it was over heating. __________________ 86 Toyota 4Runner Solid Axle Swap, 16'' of lift, 37x12.50-15 GoodYear MTR tires, Trail Gear High Steer, 5 speed manual trans swap, InchWorm Duel Cases With 5.7 Gears, 63'' Chevy Springs In The Rear, 5'' Trail Gear Springs In Front, Marlin Crawler Third Members, 4.88 Gears With A Detroit In The Rear, High Pinion Front With 4.88 Gears And An ARB, Downey Header, AFM Upgrade, Optima Battery, Trail Gear Sliders, Addicted Offroad Front Bumper, Trail Gear Rear Bumper.

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12-08-2009, 06:33 PM	#3 (permalink)
yota8083 Registered User Join Date: Nov 2008 Posts: 150	overheating while running down the road = radiator stoped up. I bet one tank is hot to the touch and the other isnt. This means the coolant is not circulating through the radiator causing the overheating.

12-08-2009, 07:50 PM	#4 (permalink)
GBRAZIL Registered User Join Date: Dec 2009 Location: Roseville, CA Posts: 4	OK. sounds simple. but is it as simple as a draining it or a complete flush Thanks for the help guys .

12-09-2009, 07:57 AM	#5 (permalink)
yota8083 Registered User Join Date: Nov 2008 Posts: 150	In this case I usually just replace the radiator. You could try flushing it first but I have found this usually doesnt fix the problem.

12-09-2009, 04:51 PM	#6 (permalink)
GBRAZIL Registered User Join Date: Dec 2009 Location: Roseville, CA Posts: 4	Well there you have it.. flush it and still gets hot when driving. guess its time to replace.