over heating - The 1947 - Present Chevrolet & GMC Truck Message Board Network

justtime520 · 03-26-2009, 01:14 PM

I have a 71 c10 327 with short water pump I just change the thermostat and water pump with new. now its over heating cant figure it out any help thanks

justtime520 · 03-26-2009, 01:20 PM

and the top hose to the intake empty after i run it. and before it was full

Camper Power · 03-26-2009, 01:38 PM

Quote:

Originally Posted by justtime520

and the top hose to the intake empty after i run it. and before it was full

if that hose is empty when the engine is warm usually means 2 things, bad thermostat or low coolant, and since the thermostat is new, the best reason is that the coolant is low, open your rad cap when the truck is cool and check the level of the coolant, if it is hard to see you'll need to top it up. the hose may have had coolant in it before but chances are there was air in the system. but dont rule out the chance of having a faulty thermostat.

sneakysnake · 03-26-2009, 01:20 PM

Was it overheating before?
Did you put the thermostat in with the spring side down?
Did you get a "newer" water pump that spins in the opposite direction.

69halfton · 03-26-2009, 01:25 PM

not trying to be insulting, or sarcastic..

but is there coolant in it?

..stranger things have happened... you and your friend put it together, and you have the classic case "i thought you put the oil in.." "..i thought YOU did"

Ive learned that the hard way

justtime520 · 03-26-2009, 01:27 PM

the spring is down the water pump is new but for the same year of engine. i think this might be the problem, the heater is hooked up but does not work. if i route the water pump to heater hose back to the intake should that fix it

justtime520 · 03-26-2009, 01:29 PM

yes also the heater hoses are burning hot as to the radiator hoses are barely warm

sneakysnake · 03-26-2009, 01:41 PM

Here is a basic sys.and direction flow.

justtime520 · 03-26-2009, 01:51 PM

the gauge is good goes up to 220 and climbing. i going to bypass the heater and see if that works if it doesnt then i have the wrong pump

spinning wheels · 03-26-2009, 01:39 PM

Quote:

Originally Posted by justtime520

I have a 71 c10 327 with short water pump I just change the thermostat and water pump with new. now its over heating cant figure it out any help thanks

What kind of gauge is reading the water temp?

I had a Stewart Warner, water temp gauge get stuck one time. I thought I had overheated. I pulled over and waited for a while. It seemed that the engine would not cool down. I tapped the gauge with my finger, damn thing dropped down to 120 degrees

You can bye pass the heater all together. I had to do that cause it looked like a green niagra falls under my dash, when the core leaked.

Longhorn Man · 03-26-2009, 03:57 PM

i say refill the rad, put the cap on, fire up the truck in the driveway, and watch it. If it is actually overheating, then you'll know.
If it is leaking out as much as it is low now, then you'll know.
But I think it'll be fine. It sounds like you had a hella air pocket in there.

justtime520 · 03-26-2009, 04:13 PM

went and pulled the casting numbers for it and did a check and it is a similar pump but not the same, but they should still work. i am pretty sure there is air in put cant figure out how to get it out. i tried letting it sit on but it overheats to about 230 then i shut it off and it still climbs. i just dont know what to do iam stranded at my house away from the world

justtime520 · 03-26-2009, 04:16 PM

i fill it up and nature take its course. but it runs for a couple of minutes until it reaches 230 and then i shut it down and the radiator is still at the top. the bottom radiator hose isnt even filling up while its running

67ChevyRedneck · 03-26-2009, 04:21 PM

Just tossing some ideas out...

Is the fan belt tight enough and turning the water pump?

Does your radiator cap and seal look like they are still in good condition?

What type of fan and fan shroud do you have on your motor? If you've been checking to see if the system works with the fan off, it will overheat.

Was it overheating before you started fixing stuff, or was it just leaking?

Does your lower radiator hose have a spring in it? Does it look like it's collapsing/closing when the truck is running?

justtime520 · 03-26-2009, 04:23 PM

every thing was working fine except for a leak. every thing is good big shroud thats just right. before this mishap it would sit at around 190 to 200 driving and at idle with no probs water pumps turning justfine.

67ChevyRedneck · 03-26-2009, 04:25 PM

I'm stumped then

justtime520 · 03-26-2009, 04:33 PM

is there a real big difference in water pumps of that generation

spinning wheels · 03-26-2009, 07:25 PM

This is just an idea. Try running the engine without a thermostat.

That may or may not help the overheating.

Only other thing I would consider, is that you got a bad pump. Maybe the blades were installed wrong (backwards) during assembly. I would take it off and return it for either an exchange or refund.
There is a reason Checkers has a lifetime warranty. They know some of the pumps they sell are turkeys, but that may be 1 out of 100.

Kager67 · 03-26-2009, 08:07 PM

Well seeing as how we are grasping at straws here, this might work if it is an airpocket in there. Drain the coolant back out and remove the heater hose that goes to the intake and refill the radiator. Just be ready to put the hose back on or you'll have a nice mess! This gives the air a place to escape. Worth a shot anyway.

Kager

sneakysnake · 03-27-2009, 10:02 AM

http://67-72chevytrucks.com/vboard/s...d.php?t=335687

westofb · 03-26-2009, 07:56 PM

I have had new thermostats stick in closed position when install new. A few light taps on the house usually causes them to open up and work as intended. I did this with motor running and starting to get hot (thermo should have been opening up), gave it a couple of taps and it made a loud pop when it opened. This is real bad about happening if you used some type of adhesive to install the water neck gasket. I can't imagine it has a air pocket in it (unless your radiator is mounted lower than the water neck) or that the pump is turning the wrong way (I could be wrong, but am quite sure all reverse turning pumps are long style intended for serpentine belt use). If none of this helps, it is possible you have a head gasket leaking compression into the water jacket. Just some point to consider, good luck getting it going!

03-26-2009, 01:14 PM	#1
justtime520 Registered User Join Date: Mar 2009 Location: Tucson AZ Posts: 187	over heating I have a 71 c10 327 with short water pump I just change the thermostat and water pump with new. now its over heating cant figure it out any help thanks

03-26-2009, 01:20 PM	#2
justtime520 Registered User Join Date: Mar 2009 Location: Tucson AZ Posts: 187	Re: over heating and the top hose to the intake empty after i run it. and before it was full

03-26-2009, 01:20 PM	#4
sneakysnake It's a catastrophic success. Join Date: Jan 2003 Location: Oklahoma Posts: 2,077	Re: over heating Was it overheating before? Did you put the thermostat in with the spring side down? Did you get a "newer" water pump that spins in the opposite direction.

03-26-2009, 01:25 PM	#5
69halfton Registered User Join Date: Apr 2007 Location: King City, Ontario, Canada Posts: 974	Re: over heating not trying to be insulting, or sarcastic.. but is there coolant in it? ..stranger things have happened... you and your friend put it together, and you have the classic case "i thought you put the oil in.." "..i thought YOU did" Ive learned that the hard way __________________ - Jason If you can turn, Youre not going fast enough. Favorite caption: first car to 200 mph in the 1/4 mile, no parachute, drum brakes all the way around.. ..back when men were men.

03-26-2009, 01:27 PM	#6
justtime520 Registered User Join Date: Mar 2009 Location: Tucson AZ Posts: 187	Re: over heating the spring is down the water pump is new but for the same year of engine. i think this might be the problem, the heater is hooked up but does not work. if i route the water pump to heater hose back to the intake should that fix it

03-26-2009, 01:29 PM	#7
justtime520 Registered User Join Date: Mar 2009 Location: Tucson AZ Posts: 187	Re: over heating yes also the heater hoses are burning hot as to the radiator hoses are barely warm

03-26-2009, 01:41 PM	#8
sneakysnake It's a catastrophic success. Join Date: Jan 2003 Location: Oklahoma Posts: 2,077	Re: over heating Here is a basic sys.and direction flow. Attached Images

03-26-2009, 01:51 PM	#9
justtime520 Registered User Join Date: Mar 2009 Location: Tucson AZ Posts: 187	Re: over heating the gauge is good goes up to 220 and climbing. i going to bypass the heater and see if that works if it doesnt then i have the wrong pump

03-26-2009, 03:57 PM	#11
Longhorn Man its all about the +6 inches Join Date: Jan 2001 Location: Hilliard Ohio Posts: 2,693	Re: over heating i say refill the rad, put the cap on, fire up the truck in the driveway, and watch it. If it is actually overheating, then you'll know. If it is leaking out as much as it is low now, then you'll know. But I think it'll be fine. It sounds like you had a hella air pocket in there.

03-26-2009, 04:13 PM	#12
justtime520 Registered User Join Date: Mar 2009 Location: Tucson AZ Posts: 187	Re: over heating went and pulled the casting numbers for it and did a check and it is a similar pump but not the same, but they should still work. i am pretty sure there is air in put cant figure out how to get it out. i tried letting it sit on but it overheats to about 230 then i shut it off and it still climbs. i just dont know what to do iam stranded at my house away from the world

03-26-2009, 04:16 PM	#13
justtime520 Registered User Join Date: Mar 2009 Location: Tucson AZ Posts: 187	Re: over heating i fill it up and nature take its course. but it runs for a couple of minutes until it reaches 230 and then i shut it down and the radiator is still at the top. the bottom radiator hose isnt even filling up while its running

03-26-2009, 04:21 PM	#14
67ChevyRedneck Hittin E-Z Street on Mud Tires Join Date: Nov 2004 Location: Greenville, SC Posts: 23,090	Re: over heating Just tossing some ideas out... Is the fan belt tight enough and turning the water pump? Does your radiator cap and seal look like they are still in good condition? What type of fan and fan shroud do you have on your motor? If you've been checking to see if the system works with the fan off, it will overheat. Was it overheating before you started fixing stuff, or was it just leaking? Does your lower radiator hose have a spring in it? Does it look like it's collapsing/closing when the truck is running? __________________ Jesse James 1967 C10 SWB Stepside: 350/700R4/3.73 1965 Ford Mustang: 289/T5-5spd/3.25 Trac-Loc 1968 Pontiac Firebird: Project Fire Chicken! 2015 Silverado Double Cab 5.3L Z71 2001 Jeep Wrangler Sport 4.0L 5spd 2020 Chevrolet Equinox Premium 2.0L Turbo 2011 Mustang V6 ~ Wife's ride American Born, Country by the Grace of God 1967 CST Shop Truck Rebuild! My 1967 C-10 Build Thread My Vintage Air A/C Install Project "On a Dime" Trying my hand at Home Renovation! 1965 Mustang Modifications! Last edited by 67ChevyRedneck; 03-26-2009 at 04:23 PM.

03-26-2009, 04:23 PM	#15
justtime520 Registered User Join Date: Mar 2009 Location: Tucson AZ Posts: 187	Re: over heating every thing was working fine except for a leak. every thing is good big shroud thats just right. before this mishap it would sit at around 190 to 200 driving and at idle with no probs water pumps turning justfine.

03-26-2009, 04:25 PM	#16
67ChevyRedneck Hittin E-Z Street on Mud Tires Join Date: Nov 2004 Location: Greenville, SC Posts: 23,090	Re: over heating I'm stumped then __________________ Jesse James 1967 C10 SWB Stepside: 350/700R4/3.73 1965 Ford Mustang: 289/T5-5spd/3.25 Trac-Loc 1968 Pontiac Firebird: Project Fire Chicken! 2015 Silverado Double Cab 5.3L Z71 2001 Jeep Wrangler Sport 4.0L 5spd 2020 Chevrolet Equinox Premium 2.0L Turbo 2011 Mustang V6 ~ Wife's ride American Born, Country by the Grace of God 1967 CST Shop Truck Rebuild! My 1967 C-10 Build Thread My Vintage Air A/C Install Project "On a Dime" Trying my hand at Home Renovation! 1965 Mustang Modifications!

03-26-2009, 04:33 PM	#17
justtime520 Registered User Join Date: Mar 2009 Location: Tucson AZ Posts: 187	Re: over heating is there a real big difference in water pumps of that generation



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03-26-2009, 07:25 PM	#18
spinning wheels Registered User Join Date: Sep 2001 Location: Hacienda Heights, California USA Posts: 474	Re: over heating This is just an idea. Try running the engine without a thermostat. That may or may not help the overheating. Only other thing I would consider, is that you got a bad pump. Maybe the blades were installed wrong (backwards) during assembly. I would take it off and return it for either an exchange or refund. There is a reason Checkers has a lifetime warranty. They know some of the pumps they sell are turkeys, but that may be 1 out of 100. __________________ '72 GMC custom camper 350/350

03-26-2009, 08:07 PM	#19
Kager67 what knocking sound? Join Date: Feb 2005 Location: good ol North Dakota Posts: 148	Re: over heating Well seeing as how we are grasping at straws here, this might work if it is an airpocket in there. Drain the coolant back out and remove the heater hose that goes to the intake and refill the radiator. Just be ready to put the hose back on or you'll have a nice mess! This gives the air a place to escape. Worth a shot anyway. Kager __________________ 1968 C-10 1953 belair two-door post 1955 chevy 3600 big window 1950 studebaker starlite coupe 1968 Impala SS

03-27-2009, 10:02 AM	#20
sneakysnake It's a catastrophic success. Join Date: Jan 2003 Location: Oklahoma Posts: 2,077	Re: over heating http://67-72chevytrucks.com/vboard/s...d.php?t=335687

03-26-2009, 07:56 PM	#21
westofb I really hate wet sanding! Join Date: Dec 2008 Location: Brookfield, MO Posts: 601	Re: over heating I have had new thermostats stick in closed position when install new. A few light taps on the house usually causes them to open up and work as intended. I did this with motor running and starting to get hot (thermo should have been opening up), gave it a couple of taps and it made a loud pop when it opened. This is real bad about happening if you used some type of adhesive to install the water neck gasket. I can't imagine it has a air pocket in it (unless your radiator is mounted lower than the water neck) or that the pump is turning the wrong way (I could be wrong, but am quite sure all reverse turning pumps are long style intended for serpentine belt use). If none of this helps, it is possible you have a head gasket leaking compression into the water jacket. Just some point to consider, good luck getting it going!

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