Cooling issues '69 427/400

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May 7, 2015 | 03:31 PM

#21

museumdelivery

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From: Newburgh NY

Quote:

Originally Posted by MelWff

Are you saying the hose from the small tube on the radiator is connected to the neck of the expansion tank? Is the link below the tank you have? The neck pipe is for overflow, the bottom pipe is for the radiator.
http://www.dewitts.com/collections/a...rge-tank-brass

No, that's not the tank that I have. My tank is the larger aluminum one that is standard for non-AC cars.

May 7, 2015 | 04:17 PM

#22

MelWff

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OK so then it is this tank and again the radiator is not supposed to be connected to the neck it goes to the small pipe on the side of the main body.
http://www.dewitts.com/collections/a...tank-non-dated

May 7, 2015 | 09:33 PM

#23

bellaireroad

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From: Fort Worth Texas

Quote:

Originally Posted by museumdelivery

Hi bellaireroad, the tank is not belching fluid when the car is turned off...it did it when the car was running. The problem is that when the car is.... turned off.... the upper radiator hose blows off rather than venting pressure to the expansion tank and then out via the cap and overflow hose. I think that you (and some of the other members who have responded) may be right about the powder coated thermostat housing. What's interesting, though, is that this problem didn't occur until after 2 months of driving the car after I intstalled the powder coated intake and thermostat housing. I think that I'll pull the radiator this weekend and after having it checked out and flushed, I'll replace the thermostat housing and keep my fingers crossed. Thanks for the reply.

Here's how the big block expansion tank is connected. The hose under the cap is the drain, and goes down through a notch in the frame. Your upper thermostat housing hose is probably blowing now and not two months ago because it was cold two months ago, and it is warming up outside now. Once you get the thermostat housing and hose to hold pressure, don't be surprised if it does belch fluid out the drain until the fluid level is correct ... Good luck

May 8, 2015 | 08:12 AM

#24

museumdelivery

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From: Newburgh NY

Quote:

Originally Posted by MelWff

Correct....I wasn't looking at the car when I responded. The nipple on the neck of the tank is for the overflow, which is the way mine is connected. The plumbing on the car is correct....I should have looked at the car before responding.

May 8, 2015 | 10:19 AM

#25

MelWff

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the tank has a full line on the outside about 1/2 way up, when totally cold are you only filling to that line?

May 11, 2015 | 08:23 AM

#26

museumdelivery

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From: Newburgh NY

Quote:

Originally Posted by MelWff

the tank has a full line on the outside about 1/2 way up, when totally cold are you only filling to that line?

Changed my mind about taking out the radiator to get it checked....instead I just changed the thermostat housing and replaced it with another cast aluminum housing (that cost $6.00 !!!). The new housing has a very well defined "lip", unlike the stock replacement, (and is , of course, not powder coated) the only difference is that it uses two short bolts rather then one long and one short. Drove the car for about 5 miles and brought it up to the correct temp........and so far, so good. I want to thank all the folks who took the time to respond to my question.