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Post Info TOPIC: Radiator issue


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Radiator issue


Hi guys

Last Saturday was super hot, hit 33°C. I drove the car on the highway, then stop & go traffic. When I got home the radiator was overflowing and temperature indicating 250°F which I never before saw such temperature.

Last year I changed the thermostat on my 67 2+2 since I had a similar issue but now I noticed that the radiator was really hot by the top and cooler or more normal towards the bottom. Wonder if it's clogged.

What should I do? Flush it or simply replace it (visually it looks original)

If I replace it, anyone can tell me what type I should replace with to get the best results. Should I get a 5-core or a 4-core?

 

Regards,



__________________

"Dad, which car are we taking?"                      "The Pontiac!"

"Which one?"                                                    "The red one!"

67 Parisienne 2+2 - red

01 Montana            - red

06 Buick Allure



Addicted!

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Im no expert but I can tell you what I did to my car,

mine was getting hot enough to turn the temp light on in traffic

so I pulled the old 2 core rad out took it to a rebuilder shop

it is now 3 core and not the normal core the high efficiency stuff!

expensive!

180f thermostat from GM

5 blade fan and the thermo thing in the centre of the fan

i was out last weekend in the heat and had no problems

my car originally had a 327 4bbl it now has a 350 4 bbl

hope that helps

there are likely other ways to fix it like electric fans 

new rad from Napa ( plastic end tanks aluminum core I think)

but like I said this is what I did and it works great

Greg



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67 Parisienne Convertible 



Member

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Posts: 15
Date:

I also had some over heating issues on the hottest of summer days with my 67. I had the original 2 core rebuilt/upgraded to 3 core. This was to retain the original tanks and mounting as I found there is difference between the Chev and Canadian Pontiac rad mounting. The Canadian Pontiac uses a spacer where the Chev used the spacer as a shroud; changed the mount positions to where a replacement rad for a chev wont fit without modifying the mount points. My Parisienne is a 327 4bbl.

I haven't had any heat related issues since. I am only using the stock fan, no electrics.



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1967 Parisienne 327/glide 2 door sport coupe. In high school saved this from being crushed, restoration in 2010.

1960 Laurentian 4 door vista hard top.



Guru

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Does your Parisienne have a shroud? Mine does not.



__________________

"Dad, which car are we taking?"                      "The Pontiac!"

"Which one?"                                                    "The red one!"

67 Parisienne 2+2 - red

01 Montana            - red

06 Buick Allure



Addicted!

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Posts: 243
Date:

There are many things to consider when it comes to keeping the engine within operating temperature. The temp differential on your rad seems extreme. If its working that efficiently you wouldnt be overheating. I solved the high temp problem in my Beaumont by installing a shroud. The ZZ4 350 ran pretty warm before adding it.

I just got my 72 Nova on the road with a fresh 454 added. After consultation with one of the more knowledgeable members of Steves Nova Site I installed a 3 row, copper and brass big block rad. His calculations take into account the flow capabilities of 3, 4 and 5 row cores as it relates to their air flow and cooling efficiency. In his opinion, more rows is not always the answer. Also, a shroud and associated fan are key. Stay away from flex fans!



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72 Nova SS,   66 Beaumont Sport Deluxe,   09 Pontiac Solstice GXP Coupe



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Date:

My Parisienne does not have a shroud around the fan. The spacer is roughly 5" and that puts the fan about an inch away from the rad.



__________________

1967 Parisienne 327/glide 2 door sport coupe. In high school saved this from being crushed, restoration in 2010.

1960 Laurentian 4 door vista hard top.



Guru

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Posts: 527
Date:

UPDATE: I flushed the radiator, run water through it until crystal clear. Must say that as I drained it the fluid didn't have any crap in it, it seemed pretty clean.

Drove the car today to work back in forth, combination of highway and city traffic, better than last time but not good enough. A friend of a friend offered me a shroud and found a place nearby that can convert my rad to a 3-core so I will consider both to solve the issue.

 



__________________

"Dad, which car are we taking?"                      "The Pontiac!"

"Which one?"                                                    "The red one!"

67 Parisienne 2+2 - red

01 Montana            - red

06 Buick Allure



Guru

Status: Offline
Posts: 524
Date:

Leo,

There is a really good radiator shop on the 520 highway near the 13, dorval radiator I believe. Its a one man shop run by a guy from France. He has done several rads for me, very happy with his work.

Before you start upgradingto bigger rads or fans or adding shrouds get what you have working right. Look at the rad inside or out for signs of rot or calcification (blockage), check the thermostat function and make sure your water pump isnt defective (impeller can rot reducing flow). The stock set up on your car was engineered to keep your engine at the right temp all the time.

__________________

John

Montreal 

16 1969 American Pontiacs

and a 1969 Canadian 2+2 Hardtop



Guru

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Posts: 527
Date:

Thanks John.

520 is quite far for me but found a really good place on Industriel in Montreal-North. Got my 2-core rebuilt and problem solved. Temp doesn't get past 160° any more.



__________________

"Dad, which car are we taking?"                      "The Pontiac!"

"Which one?"                                                    "The red one!"

67 Parisienne 2+2 - red

01 Montana            - red

06 Buick Allure

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