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overheating 66 Classic 232

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bbrooks2 View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote bbrooks2 Quote  Post ReplyReply Direct Link To This Post Topic: overheating 66 Classic 232
    Posted: Jul/30/2020 at 10:48am
I'm having over heating problems with the 232 and wanted to check the water pump. Rebuilt radiator and new thermostat. Could the pump be not circulating but not leaking? I don't see any movement of water in the radiator.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Heavy 488 Quote  Post ReplyReply Direct Link To This Post Posted: Jul/30/2020 at 11:04am
Possibly the pump or an air pocket. Does the bottom hose have a spring?
How hot is overheating?


Edited by Heavy 488 - Jul/30/2020 at 11:06am
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Post Options Post Options   Thanks (0) Thanks(0)   Quote bbrooks2 Quote  Post ReplyReply Direct Link To This Post Posted: Jul/30/2020 at 12:24pm
Every pump I've had go bad was leaking out of the hole beside the shaft and or wobbling shaft. Yes the bottom hose has a spring.
It blows hot water out of the radiator with the cap off and idling from cold start.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote 6768rogues Quote  Post ReplyReply Direct Link To This Post Posted: Jul/30/2020 at 3:45pm
I had a rebuilt radiator that still ran hot. I got a brand new radiator and it never ran hot again.
Does it run hot when idling/going slowly or all the time?
Why Ramblers? Chicks dig 'em. Whatever it is, I can take it apart.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote 232jav3sp Quote  Post ReplyReply Direct Link To This Post Posted: Jul/30/2020 at 6:26pm
Have you tried putting a fan in front of the radiator while idling? Could be not enough air being drawn through the rad by the engine's fan. 
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Post Options Post Options   Thanks (0) Thanks(0)   Quote 73hornut Quote  Post ReplyReply Direct Link To This Post Posted: Jul/30/2020 at 6:48pm
I have seen a pump with a rotted impeller. What Lb cap, what degree thermostat, 2 or 3 row rad, size fan and shroud? I would run a 180 thermo, and 13-16lb cap


Edited by 73hornut - Jul/30/2020 at 6:52pm
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Post Options Post Options   Thanks (0) Thanks(0)   Quote tomj Quote  Post ReplyReply Direct Link To This Post Posted: Jul/30/2020 at 10:27pm
Originally posted by bbrooks2 bbrooks2 wrote:


It blows hot water out of the radiator with the cap off and idling from cold start.

Not sure what you mean here -- started from cold, warmed up parked at idle, it gets warm, then hot, then boils over? As written it sounds like you start it up then it boils over!

Hose collapse isn't a problem at idle in the driveway, unless it's so visibly bad you couldn't avoid seeing it. If new radiator etc I assume the hoses are good or new.

The "new" thermostat could be stuck closed. The standard test, in the TSM, is to dangle it into boiling water to see that it opens. 

In my experience, started from cold (body temperature head and block) idling, with the radiator cap off, the water does not move. If you stick your finger in it it's cold.

As it warms, the thermostat will open sort-of all at once, and with your finger in it, it ougt to go from cold to very noticably warm in a 10 second interval, and too hot to touch a minute or two later.

It will be still (thermostat cold) then moving, sometimes a few tiny bubbles, etc, as it opens.

If that doesn't happen, it's thermostat or pump.

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Post Options Post Options   Thanks (0) Thanks(0)   Quote tomj Quote  Post ReplyReply Direct Link To This Post Posted: Jul/30/2020 at 10:29pm
Back up a bit too, and let us know: did this ever work? Was it a long term daily driver that failed? Or is it a new acquire and you've not seen oit work?

Why'd you replace those parts? 
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Post Options Post Options   Thanks (0) Thanks(0)   Quote bbrooks2 Quote  Post ReplyReply Direct Link To This Post Posted: Jul/31/2020 at 9:39am
The day I bought the car it over heated on the highway driving home. It ran fine in town but when I ran it several miles at 65 mph the temperture climbed untill it overflowed.

I did several Prestone flushes that didnt help. It got to the point I could not drive it without overheating.
I tried 1/2 gallon of vinegar and water flush and got stuff out that the other flushes didnt get. "might have rusted the fins off the pump"?

I had a shop recore not rod the stock radiator as it was plugged pretty bad and a new thermostat. "I have tried running with and without the thermostat"?

Its been parked for several years because it would not move without overheating, but now I would like to get it back on the road so...

I don't have a water temp gage hooked up right now but When I crank it, sitting in the shop at room temperature, idling, radiator full of distilled water, when it warms up it keeps heating until it starts making a hammering sound like a coffee pot percolating and pushes hot water out of the overflow.

Is it possible for the head to be plugged somewhere?
I haven't done a back flush from the lower hose would that help?
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Heavy 488 Quote  Post ReplyReply Direct Link To This Post Posted: Jul/31/2020 at 10:08am
Problem with over the counter flushes is that they only work if there's partial flow through a core tube. If the tube is blocked a chemical flush can't eat its way through 2 feet of obstruction.
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