radiator configuration - The 1947 - Present Chevrolet & GMC Truck Message Board Network

orangeblossomspecial · 04-02-2011, 02:34 PM

Radiator help please. I just pulled a blown engine out of my 86 pickup. I replaced it with a 350 out of a 71 gmc. everything worked fine (I removed all the crap) till I started it up. It over heats. I have one of the heater hoses running to the intake manifold, one to the radiator (that was the configuration on the 86) Now, no matter how hot it gets, the thermostat wont open. I have good circulation in the radiator but I wonder if the configuration is not letting pressure build behind the thermostat? Upper radiator hose never gets hot. Ive tried two new thermostats.

Thanks for the help

Those two on the deck.....thier no help. and the last pic is the engine Ive replaced. The boys said..."Dad, the engine light came on?"

gotaway · 04-02-2011, 11:26 PM

Same setup as mine. It seems to me you need to check your thermostat.

80SPORT · 04-03-2011, 01:50 AM

Try drilling a 1/8 hole in your thermostat;if an air bubble forms below the thermostat it wil not open

**old Rusty C10** · 04-03-2011, 09:06 AM

could you have an issue with the block you installed... try leaving the thermostat out and see if it overheats

80SPORT · 04-03-2011, 09:34 AM

Also....did you change the intake manifold ....if you put the intake gaskets on backward it will block the coolant to the thermostat

04-02-2011, 02:34 PM	#1
orangeblossomspecial Registered User Join Date: Sep 2008 Location: Rexburg, Idaho Posts: 34	radiator configuration Radiator help please. I just pulled a blown engine out of my 86 pickup. I replaced it with a 350 out of a 71 gmc. everything worked fine (I removed all the crap) till I started it up. It over heats. I have one of the heater hoses running to the intake manifold, one to the radiator (that was the configuration on the 86) Now, no matter how hot it gets, the thermostat wont open. I have good circulation in the radiator but I wonder if the configuration is not letting pressure build behind the thermostat? Upper radiator hose never gets hot. Ive tried two new thermostats. Thanks for the help Those two on the deck.....thier no help. and the last pic is the engine Ive replaced. The boys said..."Dad, the engine light came on?" Attached Images Last edited by orangeblossomspecial; 04-02-2011 at 05:11 PM.

04-02-2011, 11:26 PM	#2
gotaway Registered User Join Date: Feb 2011 Location: Garland, TX Posts: 3	Re: radiator configuration Same setup as mine. It seems to me you need to check your thermostat.

04-03-2011, 01:50 AM	#3
80SPORT Registered User Join Date: Mar 2008 Location: red deer alberta Posts: 777	Re: radiator configuration Try drilling a 1/8 hole in your thermostat;if an air bubble forms below the thermostat it wil not open

04-03-2011, 09:06 AM	#4
old Rusty C10 Robert Olson Transport Join Date: Oct 2002 Location: recent transplant to NC USA Posts: 20,313	Re: radiator configuration could you have an issue with the block you installed... try leaving the thermostat out and see if it overheats __________________ Bob 1951 International running on a squarebody chassis "If a man's worth is judged by the people he associates himself with, then i am the richest man in the world knowing some of the fine people of this board" http://67-72chevytrucks.com/vboard/a...t.php?f=25&a=9 (you can review the site rules here!) PM Me for your vehicle/parts hauling needs in the North East US or see my Facebook page Robert Olson Transport Live each day to the fullest.. you never know when fate is going to pull the rug out from under you... I hate cancer!!

04-03-2011, 09:34 AM	#5
80SPORT Registered User Join Date: Mar 2008 Location: red deer alberta Posts: 777	Re: radiator configuration Also....did you change the intake manifold ....if you put the intake gaskets on backward it will block the coolant to the thermostat



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