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Username Post: Getting more air into the radiator        (Topic#348318)
Posts: 107
Loc: Australia
Reg: 02-24-05
11-21-17 03:22 AM - Post#2715158    

Goodaye all

Been a while, been busy on other projects.

Has anybody cut the lower valance panel on a 57 in front of the radiator and fitted a scoop to the underside to get more air into the radiator?

A 70mph my temp goes up but 60mph its fine, l beleive its a air flow problem as it good all other times. (stopped and in traffic its fine)

regards Bruce

A Garage Full of Toys,
57 Chev 210 Wagon,
1940 Chev Sloper Coupe,
HDT Brock Grp3,
HDT Brock Magnum
LJ GTR Torana
Couger, yes l am dumb enough to build a plane.


Valued Contributor
Posts: 3611
Loc: Possums Crotch, KY
Reg: 06-26-07
11-21-17 07:36 AM - Post#2715176    
    In response to sloper

Remember the cooling rule of thumb. runs hot at low speed - not enough fan. Runs hot at highway speed - not enough radiator. At 70 MPH your getting a huge volume of air through your radiator.

Ultra Senior Member
Posts: 11019
Reg: 03-25-05
11-21-17 08:21 AM - Post#2715183    
    In response to Tri5man

I agree, air intake through the grill is not the problem. Check for a collasping lower hose. Do you have all the sheet metal around the radiator including the hood baffle. Could air be goiing around the radiator instead of through it? What RPM at 70mph? It could be timing is changing between 60 and 70.

66 Corvair (driving)
57 2dr HT (driving)
56 2dr HT (waiting to be restored)

Frequent Contributor
Posts: 1047

Loc: Tennessee
Reg: 12-06-10
11-22-17 10:07 AM - Post#2715330    
    In response to acardon

2x on acardon

Lower radiator hose needs a stiff spiral wire along it length to avoid collapsing during strong water pump suction.

Radiator core support needs both filler panels on the sides and hood baffle on top to prevent air going around rather than thru the radiator.

Thermostat may not be opening fully. Just enough to cool at low speed but not enough at high speed.

Honored Member
Posts: 27380
Loc: Katy, Tx, USA
Reg: 07-06-00
11-22-17 10:59 AM - Post#2715338    
    In response to YOUNG57

As others have said, you should be getting plenty of air through the grille.

My strongest suspicion would be a partially opening thermostat as suggested. I have had this happen - cooled fine up to about 60 mph. Increasing temp with speed above that.

Valued Contributor
Posts: 4781

Age: 67
Loc: Addison, IL
Reg: 05-28-10
11-28-17 07:44 AM - Post#2716074    
    In response to Rick_L

Make sure you have the air stop still attached to the hood that blocks the core support.

Bruces 57 
Frequent Contributor
Posts: 2394

Reg: 01-03-07
12-09-17 03:01 PM - Post#2717426    
    In response to models916

Cooling expert here (not really) but do know a lot!!
First off you didn't mention just what radiator you got??
I have one of those Champion 3 core aluminum. At first it did do a pretty good job but Idle was my problem! Then I changed from aluminum fan to a Cooling Components system. This is a beast of a cooling fan (electric) that requires a lot of heavy duty wiring as well as heavy duty 80 amp fuse and heavy duty relay, which I feed from a temp module (digital) from Davies Craig!!
Now, I found out that the (read carefully) SUM of the three tubes is less than 2 inches, 1.8" to be exact! So, my quest continued for a better radiator which I found in a 2 row radiator (read carefully) which had the sum of 2.5 inches of tube volume!! (2 rows of 1.25" tubes!)
Been on the mend from surgery of the spine and now just getting back on track so I have not added this unit to my car yet!!
Just look up the components I mentioned and get yourself an education on these! Really will help!!
Meanwhile, I would start by checking what you have and make sure that your tubes aren't clogged up and that you have a fan shroud and that everything has no air excape routs in front!!



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