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#1 |
Registered User
Join Date: Jul 2013
Location: Vallejo, California
Posts: 71
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Cooling Problem.. Help Please
Got a fresh engine build here. Hey so upon further inspection, the engine is overheating at idle. As soon as I hit the pedal, the temp shoots right back down to where it should be (almost a 30-40 degree difference)
Already: Replaced the thermostat Bled the cooling system Thoughts: Original radiator from 1972.. Water pump..? Exhaust in cooling system Help please. |
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#2 |
Senior Member
Join Date: Jan 2003
Location: daytonabeach
Posts: 22,956
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Re: Cooling Problem.. Help Please
get a new radiator// with a proper fitting shroud
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71c-10 350/2004r/4:11 lowered3/4 longbed/dead by hurricane MEANING OF DEATH::::: SOMEBODY ELSE GETS YOUR STUFF DONT BELIEVE EVERYTHING YOU THINK TAKE MY ADVISE;I DON'T USE IT ANYWAY |
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#3 |
Registered User
Join Date: Jul 2013
Location: Vallejo, California
Posts: 71
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Re: Cooling Problem.. Help Please
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#4 |
Senior Member
Join Date: Jan 2003
Location: daytonabeach
Posts: 22,956
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Re: Cooling Problem.. Help Please
nah just use that 40 year old radiator it's easy enough to change out your motor when you heat it up
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71c-10 350/2004r/4:11 lowered3/4 longbed/dead by hurricane MEANING OF DEATH::::: SOMEBODY ELSE GETS YOUR STUFF DONT BELIEVE EVERYTHING YOU THINK TAKE MY ADVISE;I DON'T USE IT ANYWAY |
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#5 | |
Registered User
![]() Join Date: Sep 2010
Location: Formerly MD and San Diego, now loving life in Arizona
Posts: 1,636
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Re: Cooling Problem.. Help Please
Quote:
Replace your radiator or have it cleaned professionally. That pugged condition is probably what toasted your previous engine.
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Alan 2012 Ram 3500 Dually Crew Cab 6.7 Cummins 2014 Palomino Columbus 340RK 5th wheel '69 Chevy C10 396BB |
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#6 | |
Registered User
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Location: Victoria, B.C
Posts: 3,794
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![]() Quote:
Coley
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....for some men, there is experience, skill and effort....for the others...there is visa and UPS LOL 1966 Chevy 1/2 ton (Florida- Red/white) 1972 Chevy 1/2 ton (California- Blue/white) 2005 Chevy Silverado HD2500/Duramax 2000 Dodge Ram 1500 |
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#7 |
Registered User
![]() Join Date: Sep 2010
Location: Formerly MD and San Diego, now loving life in Arizona
Posts: 1,636
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Re: Cooling Problem.. Help Please
Not sure about the "new radiator" part of this as we have no idea the condition of yours, however, it is not a bad idea.
More than likely lack of good airflow due to missing or incorrect shroud will cause the problems you describe. How is your fan? Original or after market? AC? Clutch fan or straight drive? Answers to these questions will help diagnose your overall problems.
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Alan 2012 Ram 3500 Dually Crew Cab 6.7 Cummins 2014 Palomino Columbus 340RK 5th wheel '69 Chevy C10 396BB |
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#8 | |
Registered User
Join Date: Jul 2013
Location: Vallejo, California
Posts: 71
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Re: Cooling Problem.. Help Please
Quote:
EDIT: No AC. EDIT 2: No heater core hooked up. Last edited by IntegratedTJ; 04-28-2015 at 05:46 PM. |
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#9 |
Registered User
Join Date: Oct 2005
Location: Overland Park, Ks.
Posts: 5,216
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Re: Cooling Problem.. Help Please
Almost sounds like something with the gauge. If you have acces to a laser thermometer you can find out what is really happening. I can't imagine that much change in a very short time.
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#10 |
Registered User
![]() Join Date: Jan 2015
Location: Charlotte, NC
Posts: 483
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Re: Cooling Problem.. Help Please
Can help in that department!
Baller Setup: http://www.entropyrad.com/1967-1972-...-radiator.html Driver Setup: http://www.speedcooling.com/1967-197...r/prod_38.html
__________________
* Call me NOT the website number* Justin Novick (773) 303-8251 Sales/Support Entropy Radiator / Engineered Cooling Products "The Sexiest Radiators For The Sexiest Hot Rods" - www.EntropyRad.com www.speedcooling.com |
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#11 |
Registered User
Join Date: Mar 2013
Location: Anaheim Hills, CA
Posts: 323
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Re: Cooling Problem.. Help Please
If you bored out the engine in the build it will require a little more cooling performance due to less cyl wall thickness. If your old radiator was just enough the build may have pushed it over the top.
I had a 66 gto that had a very well worn engine. it was just fine running the stock 3 row radiator but it ran very hot with the .060 overbored rebuild and I had to have it re-cored to 4 core. Blockages/ plugged core tubes will also cause the same issues you mentioned.
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1971 Cheyenne Big Block Longhorn |
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#12 |
Registered User
Join Date: Apr 2009
Location: houston texas
Posts: 1,438
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Re: Cooling Problem.. Help Please
IF ITS BLOWING COOLANT OUT THERMOSTAT MAY BE STICKING. you can get a bad new one. I have. put thermostat on stove in a pan of water see if it opens.
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#13 | ||
"I ain't nobody, dork."
Join Date: Sep 2007
Location: Whidbey Island, Washington
Posts: 8,940
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Re: Cooling Problem.. Help Please
Never heard of needing more cooling after an overbore...
However, even though Mr. cdowns was blunt with his answer... he makes a good point. If you're trying to cool down any engine with a worn out 40 year old radiator full of rust and crust... you'll have problems. No way would I reuse a 40 year old untouched stock radiator with a brand new engine. Eithe you'll probably need a new radiator, or have it recored or rodded out. Gary
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'cuz chicks dig scars... My 1972 GMC 1500 Super Custom (Creeping Death) "long term" build thread. The Rebuild of Creeping Death after the wreck Quote:
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#14 | |
Registered User
Join Date: Jun 2013
Location: West Virginia
Posts: 6,421
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Re: Cooling Problem.. Help Please
Quote:
![]() I'd try another thermostat and then look into a new radiator. I bought a 3 row at Advance Auto for around $200.00. |
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#15 |
Registered User
![]() Join Date: Oct 2012
Location: Newhall CA
Posts: 1,195
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Re: Cooling Problem.. Help Please
do you have your fan installed correctly ? don't laugh i have seen it before. left untouched the blades will fly off , and hopefully not through the hood...
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69 SWB 780hp Hellcat powered, manual 6 speed, currie 9 |
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#16 |
Born Psycho
![]() Join Date: Feb 2001
Location: brentwood,cal,usa
Posts: 4,881
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Re: Cooling Problem.. Help Please
if i read your post correctly it was overheating before and the only common denominator is the old radiator
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jerry moss 72 cheyenne super K20- tilt,tach,vacuum,speedwarning,buckets,shoulder belts,am/fm,tow hooks,bumper guards,toolbox,aux. fuel tank,posi front and rear,plus other goodies!!! SOLD 69 suburban K20-tilt,tach,vacuum,speedwarning,buckets,shoulder belts,am/fm,4 inch all spring lift,4 speed, 14 bolt full floater, dana 44 HD,warn winch,posi front and rear,tow hooks,plus other goodies. 73/80 chevy/gmc K20 SB400,turbo 400,205,tilt,a-c,gas hog. 77 K/5 cheyenne blazer-daily driver/beater. SON HAS IT NOW BRENTWOOD,CALIFORNIA |
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#17 |
Registered User
![]() Join Date: Jan 2015
Location: Charlotte, NC
Posts: 483
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Re: Cooling Problem.. Help Please
There is some weight to the overbore theory...if the walls are thinner, they can allow heat transfer or hot sport between cylinders, assuming the sleeves and/or cooling jackets are that close together
Running a crust-o-matic 40yr old rad might not help either. Always start with the simple things first: coolant level, t-stat, air, fans, rad
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* Call me NOT the website number* Justin Novick (773) 303-8251 Sales/Support Entropy Radiator / Engineered Cooling Products "The Sexiest Radiators For The Sexiest Hot Rods" - www.EntropyRad.com www.speedcooling.com |
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#18 |
Registered User
Join Date: Oct 2007
Location: Spanaway
Posts: 8,451
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Re: Cooling Problem.. Help Please
Any good radiator shop can flow test a radiator to let you know if its plugged up. The fact that the coolant pulls into the radiator when reved me leads me to think its flowing ok.
You don't have the heater core hooked up, did you run a bypass hose? and are you sure its routed correctly? can you post a pic? if its on the intake and the wrong water pump port it could be a problem.
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Mike. Swamp Rat build thread : http://67-72chevytrucks.com/vboard/s...d.php?t=595019 72 3/4T 4X4 4" BDS Lift 33" BFG's |
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#19 |
Registered User
![]() Join Date: Jan 2015
Location: Charlotte, NC
Posts: 483
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Re: Cooling Problem.. Help Please
any results from the overheating issue?
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* Call me NOT the website number* Justin Novick (773) 303-8251 Sales/Support Entropy Radiator / Engineered Cooling Products "The Sexiest Radiators For The Sexiest Hot Rods" - www.EntropyRad.com www.speedcooling.com |
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