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08-25-2018, 10:45 PM
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#1 |
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Registered User
Join Date: Jul 2018
Location: Spring, TX
Posts: 6
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Over heating problem
Hey guys, so I just bought a 69 c10. Truck has a 350 with aluminum heads and cam. Truck has a/c as well. Well when cruising down the highway at about 65 it’s at 3200-3300 rpm. It starts to go up pretty quick. When I noticed it going to 220 I slowed down and pulled off the highway. I’ve noticed it only does it when I’m on the highway and staying at or above the 3k rpm range. At idle and just cruising around town it stays at 170-180 all the time.
Any help on what I need to do to fix this problem. It has dual fans but maybe I need a bigger radiator. Maybe a new thermostat sensor? Thanks guys |
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08-25-2018, 11:53 PM
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#2 |
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Who Changed This?
 
Join Date: Jan 2013
Location: Simi Valley, CA
Posts: 10,708
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Re: Over heating problem
#1 cause for running hot at high speeds is a bad radiator. Getting it cleaned or replacing it should cure the problem.
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~Steven '70 Chevy 3/4T Longhorn CST 402/400/3.56 Custom Camper Simi Valley, CA |
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08-25-2018, 11:58 PM
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#3 |
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laying low
Join Date: Mar 2001
Location: Searcy, Ark. USA
Posts: 13,531
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Re: Over heating problem
Reducing the rpms will lower the engine heat as well. Either slow down or swap the rear end gears to a higher ratio will lower the engine heat. Or if ya got bucks, installing an over drive trans or gear vendors od unit will get ya there.
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Boog 69 Chevy stepside, 358/T350, 4.11 posi, 4.5/4 drop, rallys, poboy driver primer is finer 91 Chevy sportside, Tahoe, Yukon & GMC Crewcab All GM..'nuff said. I stand for the flag and kneel at the cross |
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08-26-2018, 12:21 AM
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#4 |
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Senior Member
Join Date: Jul 2015
Location: Fairfax, Missouri
Posts: 1,049
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Re: Over heating problem
I'd say it's the radiator also. Buy a new aluminum one as it will cool alot better. ECP makes a real nice one. That's Engineering cooling products. Put one in my Camaro and all my problems went away.
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08-26-2018, 01:30 PM
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#5 |
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Registered User
Join Date: Jan 2007
Location: Puyallup, WA
Posts: 1,662
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Re: Over heating problem
Do you have a shroud?
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72 C10 lwb fleetside -stock 350/350 combo |
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08-26-2018, 01:44 PM
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#6 |
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Senior Member
Join Date: Jul 2015
Location: Fairfax, Missouri
Posts: 1,049
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Re: Over heating problem
Yes, My original radiator was taken to a shop and was redone. Had a shroud on it also, but would run hot. Everyone said to ditch the solid 4 blade fan and get a clutch fan so I did with no response.Even played around with different thermostats. Ended up buying the ECP radiator and all my problems went away. When I get closer to getting my 72 k10 with A/C I'm buying one for it. I have a factory radiator for it, but it would need sent to the shop to be tested/fixed and I'm not going down that path again and waste money.
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