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Old 03-06-2004, 06:36 PM
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389 overheating

i need some help, i have a 65 pontiac lemans w/ a 389. it is overheating pretty quickly while at idle. i have no thermostat currently in and while idling with the radiator cap off i really didnt observe any flow, temp reached 210 degrees. i shut it off and stuck my finger into the radiator and the fluid was pretty cold, is this a water pump problem or possibly some other type of flow problem. any ideas would be greatly appriciated!!!!

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Old 03-06-2004, 06:38 PM
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collapsed hose?

radiator blockage?
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Old 03-06-2004, 06:41 PM
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oh yeah

i just recently re installed my original freshly recored 4 core radiator!
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Old 03-06-2004, 07:06 PM
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air in the system some where.
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Old 03-06-2004, 07:14 PM
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how do i get rid of an air lock

if there is air in the system, any tips to get rid of it?
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Old 03-06-2004, 07:24 PM
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hmmmm.....

if you have no t-stat in.....
and ran it with the cap off.....
and it heated up to 210.....
no coolant circulation......

is the cap located at the highest point in the system?

is there anywhere you can open it up to vent at a higher location?

how old is this h20 pump?

doh' i can't believe i forgot, how old is the sending unit to your temp gage?
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Old 03-06-2004, 07:28 PM
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brand new temp gauge and sender

the filler neck i believe is at the highest point, and the water pump i believe is pretty old!!!!!!!!!!!1
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Old 03-06-2004, 07:34 PM
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man i hate to change a h2o pump.

oh, wait, i'm not!

i can't think of anything else.....

last time i had overheating problems, i replaced every freakin' thing except the sending unit. and you know that's what it was......

i'd try a new pump if the one on it has been there awhile....
you didn't say why you had the rad recored.... if it was nasty, you could very well have a wore out pump.....

besides, a newly recore radiator deserves a new h2o pump
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Old 03-06-2004, 09:33 PM
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when my cav was overheating it was due to a faulty thermostat...

edit: i just saw you were running no tstat...its a freakin 6 dollar part and well worth the 6 bucks
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Old 03-07-2004, 12:49 AM
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quote: i just saw you were running no tstat...its a freakin 6 dollar part and well worth the 6 bucks

Amen!! I would pick up a new water pump, t-stat, and maybe a hose or two, flush the entire system good (especially the radiator, even a new one if the $$ allows). That oughta fix any overheating for awhile.
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Old 03-23-2004, 04:58 PM
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think i figured it out

when i took the waterpump off( remeber pontiac water pump is like 3 pieces that attatch to the timing cover, wish i knew this!!!) and found out after a whole lot of trial and error that my water pump was missing the internal housing and divider plates from with in it. i just ordered these and hoping it will fix, anyone think this couldve been the cause. and yes bought a new thermo stat and temp gauge!!! man i hope this solves the prob
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