Can't figure out why my truck is running hot - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Bulldog88 · 07-27-2016, 10:48 PM

Can't figure out what's wrong, I replaced, The water pump, thermostat, radiator, fan clutch and gets hot in about 10 minutes from a cold start, oil is not milky but just wondering if it's possible I have a blown head gasket

ls1nova71 · 07-27-2016, 11:06 PM

Are you sure it's full of coolant? Did you fill the engine through the top radiator hose? If you just put coolant in the radiator, it will not go into the engine and therefore not get to the back side of the thermostat so it won't open.

**oldman3** · 07-27-2016, 11:18 PM

Quote:

Originally Posted by ls1nova71

Are you sure it's full of coolant? Did you fill the engine through the top radiator hose? If you just put coolant in the radiator, it will not go into the engine and therefore not get to the back side of the thermostat so it won't open.

This is a MUST, and you should be OK...Jim

Bulldog88 · 07-27-2016, 11:55 PM

Yes it full I'm filling it up thru the water tank that the Silverado are equipped with, once it starts getting hot it spits water thru that tank and the small overflow hose that's there

71swb4x4 · 07-28-2016, 12:06 AM

Have you confirmed the temp? A bad radiator cap will allow it to spit out.

JAKA · 07-28-2016, 11:42 AM

Is it possible the drive belt is routed incorrectly?

akdg87 · 07-28-2016, 01:31 PM

Quote:

Originally Posted by Bulldog88

Yes it full I'm filling it up thru the water tank that the Silverado are equipped with, once it starts getting hot it spits water thru that tank and the small overflow hose that's there

Absolutely need to remove the upper radiator hose and fill the motor from there. It even helps to pop the steam vent line off to purge the air out of system.

homemade87 · 07-29-2016, 07:56 AM

Quote:

Originally Posted by Bulldog88

Yes it full I'm filling it up thru the water tank that the Silverado are equipped with, once it starts getting hot it spits water thru that tank and the small overflow hose that's there

This is your problem . You will never get the air out of the engine this way . Do as other suggested remove the upper radiator hose and fill . Sometimes it helps to raise the front of the truck also if you have a stubborn one .

Andy4639 · 07-30-2016, 11:30 PM

Taking the steam port loose on the intake passenger side was the only way I got mine to work. Losen it up and when you see liquid coming out tighten it up and finish filling.
I also had the front end on a lift as high as it would go.

cmcolumbus · 08-01-2016, 03:42 AM

I was having the same problem but after I filled it from the top radiator hose and removed the coolant sensor on one side and the plug on the other of the heads until coolant ran out everything was fine and had no problem.

cookseyb · 08-04-2016, 10:14 PM

It helps if you raise the front of the vehicle up until the radiator is the highest point in the system. Fill through the upper hose until you think it is full, wait 2 hours and fill it again, repeat as necessary to remove the "air Lock" you currently have.

07-27-2016, 10:48 PM	#1
Bulldog88 Registered User Join Date: Nov 2009 Location: DFW,TX Posts: 233	Can't figure out why my truck is running hot Can't figure out what's wrong, I replaced, The water pump, thermostat, radiator, fan clutch and gets hot in about 10 minutes from a cold start, oil is not milky but just wondering if it's possible I have a blown head gasket

07-27-2016, 11:06 PM	#2
ls1nova71 Registered User Join Date: Dec 2009 Location: Independence Mo Posts: 4,119	Re: Can't figure out why my truck is running hot Are you sure it's full of coolant? Did you fill the engine through the top radiator hose? If you just put coolant in the radiator, it will not go into the engine and therefore not get to the back side of the thermostat so it won't open. __________________ My '72 short bed build. http://www.ls1tech.com/forums/conver...6-0-4l80e.html 5.3 swap into my RUSTY '71 C10 http://ls1tech.com/forums/conversion...71-c-10-a.html

07-27-2016, 11:55 PM	#4
Bulldog88 Registered User Join Date: Nov 2009 Location: DFW,TX Posts: 233	Re: Can't figure out why my truck is running hot Yes it full I'm filling it up thru the water tank that the Silverado are equipped with, once it starts getting hot it spits water thru that tank and the small overflow hose that's there

07-28-2016, 12:06 AM	#5
71swb4x4 Senior Member Join Date: Nov 2003 Location: Brookings, SD Posts: 10,497	Re: Can't figure out why my truck is running hot Have you confirmed the temp? A bad radiator cap will allow it to spit out. __________________ Some people are like slinkies, they aren't good for anything, but you can't help but smile when you see one tumble down the stairs.

07-28-2016, 11:42 AM	#6
JAKA Registered User Join Date: Apr 2009 Location: Murray,KY Posts: 39	Re: Can't figure out why my truck is running hot Is it possible the drive belt is routed incorrectly?

07-30-2016, 11:30 PM	#9
Andy4639 Old member Join Date: Jan 2002 Location: Liberty, & Garden City S.C. , U.S. Posts: 19,945	Re: Can't figure out why my truck is running hot Taking the steam port loose on the intake passenger side was the only way I got mine to work. Losen it up and when you see liquid coming out tighten it up and finish filling. I also had the front end on a lift as high as it would go. __________________ 1971 LWB Custom, 6.0LS & 4L80E, Speedhut.com GPS speedometer & gauges with A/C. 20" Boss 338's Grey wheels 4 wheel disc brakes. My Driver Seeing the USA in a 71 Upstate SC GM Truck Club 2013,14 and 2016 Hot Rod Pour Tour http://upstategmtrucks.com/ Get out and drive the truck this summer and have some fun! It sucks not being able to hear! LWB trucks rule, if you don't think so measure your SWB! After talking to tech support at Air Lift I have found out that the kit I need is 60811. Per the measurements I gave them. Ride height of truck inside spring and inside diameter of springs.

08-01-2016, 03:42 AM	#10
cmcolumbus Registered User Join Date: Apr 2007 Location: Hayward CA Posts: 27	Re: Can't figure out why my truck is running hot I was having the same problem but after I filled it from the top radiator hose and removed the coolant sensor on one side and the plug on the other of the heads until coolant ran out everything was fine and had no problem.

08-04-2016, 10:14 PM	#11
cookseyb Registered User Join Date: Jan 2011 Location: Mullin, Texas Posts: 16	Re: Can't figure out why my truck is running hot It helps if you raise the front of the vehicle up until the radiator is the highest point in the system. Fill through the upper hose until you think it is full, wait 2 hours and fill it again, repeat as necessary to remove the "air Lock" you currently have.



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