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#51 |
Registered User
Join Date: Dec 2007
Location: Riverside, Ca
Posts: 407
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Re: Cooling Issues
How would i check the cap to make sure it is working?
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Lifted 2wd 1969 C20/ 5.3LS/4L60E :http://67-72chevytrucks.com/vboard/s...d.php?t=728388 |
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#52 |
Registered User
Join Date: Dec 2007
Location: Riverside, Ca
Posts: 407
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Re: Cooling Issues
I had a quick thought when i was gettin ready this morning. . we were talking about possible air flow issues and it dawned on me, when my truck gets hot and im sittin at a light at idle, i put it into natural and bring the rpm's up and the temp falls a bit. does that change anything?
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Lifted 2wd 1969 C20/ 5.3LS/4L60E :http://67-72chevytrucks.com/vboard/s...d.php?t=728388 |
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#53 |
20' Daredevil (Ret)
![]() Join Date: May 2003
Location: Jefferson State
Posts: 13,643
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Re: Cooling Issues
That's normal, because the coolant will circulate faster, but mainly because the fan will move more air...
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- Mike - 1972 K20 LWB 350/350/205 RIP El Jay |
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#54 |
Registered User
Join Date: Dec 2007
Location: Riverside, Ca
Posts: 407
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Re: Cooling Issues
ok but does that mean i have an air flow problem?
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Lifted 2wd 1969 C20/ 5.3LS/4L60E :http://67-72chevytrucks.com/vboard/s...d.php?t=728388 |
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#55 |
Registered User
Join Date: Aug 2001
Location: rock island,il,usa
Posts: 5,382
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Re: Cooling Issues
It sounds like an airflow problem to me.....but if that is so, it should run cooler @ highway speeds, than it does in town. If it were mine, I would install a smaller waterpump pulley(1-1 1/2" smaller), & see what happens. You could also have other issues ,as in timing,or lean carburation. I like to set the total timing @34 degrees @ 3000 rpms(vac can unhooked & plugged on a pump fuel smallblock). on an HEI dist, this will relate to approx 12-14 degrees intial @ idle with the vac unhooked. I would address those 2 things 1st, & move on from there. another thought.....what carb are you running,& how much vacumn does the engine pull @ idle?(possible air leak?) Is the waterpump brand spankin new? crazyAl
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#56 |
20' Daredevil (Ret)
![]() Join Date: May 2003
Location: Jefferson State
Posts: 13,643
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Re: Cooling Issues
Maybe -- but not necessarily. I have owned new or near-new vehicles, with everything in top condition, do the same thing -- probably just as a result of very high ambient temps and cooling system designs that were perhaps not quite up to extreme heat.
Since yours cools down a bit at higher RPM, air is being pulled through the radiator by the fan. Did you ever check the gap between the fan shroud and the radiator? If so, I missed it...
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- Mike - 1972 K20 LWB 350/350/205 RIP El Jay |
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#57 |
Living In The Past
Join Date: Nov 2003
Location: Rockies
Posts: 709
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Re: Cooling Issues
lot of good suggestions here already. I will throw some more possibilities out.
You say same engine that was overheating was rebuilt? Was it hot tanked and thoroughly cleaned checked for cracks? bored over? Cylinder walls too thin? Were new heads checked for cracks? Have you looked into the radiator with the cap off and the engine running? If not do so and see if there are any bubbles in the water. |
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#58 |
Registered User
Join Date: Dec 2007
Location: Riverside, Ca
Posts: 407
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Re: Cooling Issues
Yes i checked the gap it was pretty much non existant.
i have looked into the rad when it was running and no bubbles just the flow of coolant. i really dont know if they checked everything for leaks or too thin of side walls, alls i know is the motor ran at a great op temp when i had it built in cali and then when i came to az it started over heating constantly. and crazy al i am running a edelbrock 600cfm and the water pump is about 2-3 years old now.
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Lifted 2wd 1969 C20/ 5.3LS/4L60E :http://67-72chevytrucks.com/vboard/s...d.php?t=728388 |
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#59 | |
Registered User
Join Date: Jan 2006
Location: Take Off
Posts: 1,908
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Re: Cooling Issues
Quote:
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#60 |
Registered User
Join Date: Aug 2001
Location: rock island,il,usa
Posts: 5,382
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Re: Cooling Issues
Did you get her sorted out? crazy Al
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#61 |
Registered User
Join Date: Dec 2007
Location: Riverside, Ca
Posts: 407
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Re: Cooling Issues
No unfortunately, i ended up having some crazy things go on and had to move out on a one day notice, spent every dime i had to cover the new apartment so i gotta wait until i have even $10 to try the T-stat lol.
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Lifted 2wd 1969 C20/ 5.3LS/4L60E :http://67-72chevytrucks.com/vboard/s...d.php?t=728388 |
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#62 |
Registered User
Join Date: Aug 2001
Location: rock island,il,usa
Posts: 5,382
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Re: Cooling Issues
Let us know how it goes..... crazy Al
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#63 |
Registered User
Join Date: Nov 2008
Location: Tempe, AZ
Posts: 181
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Re: Cooling Issues
did you ever figure anything out? i have a fairly similar issue i am working on now.
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1970 GMC- 454 DONT GIVE ME NO JIBBA JABBA!!! |
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