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I am having an issue with overflow on radiator.
#1417576 Wed Jul 21 2021 01:30 AM
Joined: Feb 2001
Posts: 7,007
W
'Bolter
Last winter I changed the thermostat from 165 to 180. And also put on one of those safety caps. Ever since I have had an issue of antifreeze smell after driving a while. Drove it yesterday and today and the same thing. I have a leak somewhere because is residue on the alternator. It is a 1954 with the straight-six. It did not overheat. I check the housing bolts and they are tight.


Ron, The Computer Greek
I love therefore I am.

1960 MGA Roadster Sold 7/18/2017
1954 3100 Chevy truck in the Gallery
2017 Buick Encore
Pix on Photobucket
Re: I am having an issue with overflow on radiator.
WE b OLD #1417586 Wed Jul 21 2021 02:56 AM
Joined: Jun 2011
Posts: 4,244
E
'Bolter
If there is no overflow tank, not standard, if filled to the top when cold, there will always be some water overflow as the engine heats up. Filling the radiator to an inch or so below full will stop that problem, a non-standard overflow catch container will also solve that problem.

Ed


'37 GMC T-18 w/ DD 4-53T, RTO-610, 6231 aux., '95 GMC running gear, full disc brakes, power steering, 22.5 wheels and tires.
'47 GMC 1 ton w/ 302, NP-540, 4wd, full width Blazer front axle.
'54 GMC 630 w/ 503 gasser, 5 speed, ex fire truck, shortened WB 4', install 8' bed.
'55 GMC 370 w/270, 420 4 speed, grain, dump bed truck from ND. Works OK.
Re: I am having an issue with overflow on radiator.
WE b OLD #1417611 Wed Jul 21 2021 01:31 PM
Joined: Mar 2017
Posts: 290
L
'Bolter
I also replaced my 160 with a 180 (which tested out to almost 190!), and ended up springing a leak in my heater core. I switched back to the 160 and replaced the core. Hopefully you don’t have that problem.

Lee.


1956 Chevy 3200, 235 w/3 speed
Re: I am having an issue with overflow on radiator.
WE b OLD #1417617 Wed Jul 21 2021 02:43 PM
Joined: Mar 2010
Posts: 654
B
Curmudgeon
54 Chevy truck specs:

A stock radiator cap pressure valve opens between 3-1/2 to 4-1/2 lbs.
A stock thermostat @ 29 Hg Barometric Pressure opens at 148 to 156 degrees F and fully open by 176 degrees F.

I wouldn't go higher than a 4 lb. cap for risk of damaging an original radiator and heater core.

From the radiator fill neck, the overflow tube runs down the side of the radiator (passenger side) to let the coolant hit the road.
If your alternator is on the driver's side of the engine, I would look around the water pump and thermostat housing for evidence of leaking.

Last edited by buoymaker; Wed Jul 21 2021 02:47 PM.
Re: I am having an issue with overflow on radiator.
WE b OLD #1417671 Wed Jul 21 2021 11:38 PM
Joined: Feb 2001
Posts: 7,007
W
'Bolter
The truck has an aftermarket aluminum radiator. I have driven to KC 9 times over the last 11 years in Sept 95 degree temps running 70 MPH. with no issues. It has an aluminum overflow tank on the firewall. It also has an electric fan but I rarely use it. Before I replaced the thermostat it would not run as hot as it is now. Soon it will be my daily driver until decide what I am going to do about a new car, I am giving my granddaughter my 2017 Encore in about a month. One problem is I have one of those safety caps with a release lever and it does not always seat the lever in its slot. I just put it on new. I may go back to the 160 thermostats.


Ron, The Computer Greek
I love therefore I am.

1960 MGA Roadster Sold 7/18/2017
1954 3100 Chevy truck in the Gallery
2017 Buick Encore
Pix on Photobucket
Re: I am having an issue with overflow on radiator.
WE b OLD #1417674 Wed Jul 21 2021 11:59 PM
Joined: Mar 2004
Posts: 5,244
M
'Bolter
Ron,

What pressure is the cap you're using? Maybe go back to the old cap and see if the problem goes away.

Mike B smile

Re: I am having an issue with overflow on radiator.
WE b OLD #1417682 Thu Jul 22 2021 12:27 AM
Joined: Feb 2019
Posts: 2,138
P
AD Addict
Sounds to me like the cap may be suspect and would be the first thing I would replace. I have a ‘59 235 and I put a 4 lb. cap on a stock radiator with a 180° thermostat. It runs at 180° constantly.


Phil

1952 Chevrolet 3100
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Re: I am having an issue with overflow on radiator.
WE b OLD #1417722 Thu Jul 22 2021 10:34 AM
Joined: Feb 2001
Posts: 7,007
W
'Bolter
I did some sleuthing and found the old cap and thermostat. The thermostat was a high flow 180 for off-road use. I have ordered a new cap that is a lower pressure cap. Today's temps are to be in the upper 70s so it might not be the best time to do a test but I will anyway. ohwell


Ron, The Computer Greek
I love therefore I am.

1960 MGA Roadster Sold 7/18/2017
1954 3100 Chevy truck in the Gallery
2017 Buick Encore
Pix on Photobucket

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