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#607316 - Tue Jan 05 2010 01:20 PM radiator overflow problem  
josie  Offline
New Guy
Joined: Sep 2009
Posts: 5
hey guys i havent found my answer on the topic forum so my problem is i have a 49 pickup which i have had for years all original except motor which is a 235 62 chevy motor,it has always seemed to have antifreeze loss thru the radiator overflow tube,i have changed all hoses new radiator,new water pump,several thermostats,new heater hoses,fresh antifreeze and it will still lose water whether summer or winter especially just sitting there idling and i have lowered the level in the radiator it still wants to come out the overflow tube i have given up until i met this web site can you give me a clue josie

#607319 - Tue Jan 05 2010 01:36 PM Re: radiator overflow problem [Re: josie]  
Pete52  Offline
Shop Shark
Joined: Jan 2009
Posts: 1,772
melrose pk. il.
How's the temp? If it's not overheating could be the rad cap needs to be replaced might not be seating against the rad inside lip where the rubber seals against the rad what pound rad cap are you running?Check to make sure your cap is sealing against the rad.lip inside the rad.


Last edited by Pete52; Tue Jan 05 2010 01:39 PM.

#607335 - Tue Jan 05 2010 02:50 PM Re: radiator overflow problem [Re: Pete52]  
Denny Graham  Offline
Extreme Gabster
Joined: Oct 2006
Posts: 10,612
Sandwich, IL
Josie, if you keep adding coolant you’re going to keep boiling it out. The level in a stock AD radiator when "cold" should be just barley above the baffle in the radiator. This is often mistaken as a low coolant level, if you add coolant to bring it up some it's just gonna puke it out. As Pete stated, if your temperature is running normal then let it seek it's own level, put the cap on and forget it. If the cooing system is stock then it is a zero pressure system, you can get away with a 4lb. cap but no more or you will be bending tubes in the radiator and heater coil. Running your cooling system at 4lb. will increase the boiling point slightly. Your '62-235 would have originally run a 160° to 180° thermostat depending on the season.
Denny Graham
Sandwich, IL

#607344 - Tue Jan 05 2010 03:15 PM Re: radiator overflow problem [Re: Denny Graham]  
dale937  Offline
Shop Shark
Joined: Dec 2003
Posts: 4,896
NE Ohio
The simple fix is to install an overflow jug.It is natural for your radiator to overflow as the coolant heats up.

#607345 - Tue Jan 05 2010 03:16 PM Re: radiator overflow problem [Re: Denny Graham]  
Virginiafiretruck  Offline
Shop Shark
Joined: Jan 2005
Posts: 1,924
Virginia Beach
I agree with Denny. I run a zero degree cap and it doesn't overflow a single drip.

#607421 - Tue Jan 05 2010 08:41 PM Re: radiator overflow problem [Re: Virginiafiretruck]  
PapaJ  Offline
Shop Shark
Joined: Feb 2009
Posts: 439
Security, CO
I would make sure and check when the motor is idling if in fact that it is leaking out the overflow tube and not the water pump or hoses.You can do a pressure test to find out.

1953 Chevy Two-Ton
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Be careful calling yourself a expert,because an "EX" is a hasbeen and a"SPERT" is a drip under pressure.

#607676 - Wed Jan 06 2010 06:57 PM Re: radiator overflow problem [Re: PapaJ]  
truckernix  Offline
Joined: Mar 2002
Posts: 8,821
Bracebridge Ontario Canada
I would check the temperature of the upper rad hose when the gauge says it is warm. If the rad hose is cool, you have an air lock behind the thermostat and the coolant in the block will form voids and expell coolant out the overflow. This situation will not alwayys cure itself and in that case the air needs to be removed.

1951 GMC 1 Ton Flatbed -- It is finally on the road and what a great time I have driving it!
1951 1 Ton Completed

My Chevy Master 4 Door is on the Road!

#607759 - Wed Jan 06 2010 11:41 PM Re: radiator overflow problem [Re: truckernix]  
Spareparts2  Offline
Shop Shark
Joined: Jul 2006
Posts: 227
Lansing, Ks
Check the cap if it has a "R" in the part # it is the wrong cap it is for a system with a coolant jug. It will expell coolant into the jug when when it gets up to temp and suck the coolant back into the radiator when it cools off. The coolant level should be about 2 knuckles down on your index finger(old country boy measurement).

You Learn more Listening than Talking

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