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| | | | Joined: Nov 2014 Posts: 164 'Bolter | | 'Bolter Joined: Nov 2014 Posts: 164 | I'm losing coolant from the radiator but I can't tell from exactly where. It doesn't appear to be from the hoses but toward the bottom of the radiator. I guess doing a pressure test is the next step but I don't know how to do that and don't have the equipment. I looked in the tech tips for some info but couldn't find anything. My radiator is a Champion aluminum that's about 7 years old. What's your advice? Thanks!
~Denny 1953 Chevy 3100 w/1960 261 cid, 848 head | Weber 32/36 progressive 2 barrel carb. | Three on the tree & 3:55 torque tube | 12 V w/Gener-Nator & 6 V starter In the Gallery Forum1998 Chevy Suburban 350 ci awd/4wd | | | | | Joined: Jan 2022 Posts: 2,441 'Bolter | | 'Bolter Joined: Jan 2022 Posts: 2,441 | Most decent FLAPS has a loaner cooling system pressure tester. I know my O'Reilly's and Auto Zone do.
'57 GMC 102, Original 347 V8, HydraMatic, 3.08 rear gear, added A/C, disk front brakes, HEI, AFB carb, '98 Honda Black Currant paint. T-boned and totaled 10/12
'52 GMC 152 Stake Bed, Original 228, SM420, added A/C, HEI, disk front brakes, '67 Chev 3.55 rear gear. Gets used as a real truck.
| | | | | Joined: Oct 2021 Posts: 6,730 'Bolter | | 'Bolter Joined: Oct 2021 Posts: 6,730 | If you know the leak is from the radiator, there's no reason to waste time testing it for a leak.
Take it to a radiator repair shop. Here, the local place charges $65 to clean out the radiator and find and repair the leak.
1950 Chevrolet 3100 (Ol' Roy)
1939 Packard Standard Eight Coupe (The Phantom) | 1956 Cadillac Coupe de Ville (The Bismarck) | 1964 Ford Galaxie 500 coupe |1966 Ford Mustang (Little Red) | 1969 Pontiac GTO (The Dishpit) I 1979 Ford F-100 | 1976 Ford F-150 (Big Red) | 1995 Ford F-150 (Newt)
| | | | | Joined: Jun 2011 Posts: 5,096 Crusing in the Passing Lane | | Crusing in the Passing Lane Joined: Jun 2011 Posts: 5,096 | If one cannot tell where a leak is, it could also be internal to the engine. Park over a clean floor to locate. Could be head gasket, water pump, freeze plug, cracked block!
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.
| | | | | Joined: Nov 2014 Posts: 164 'Bolter | | 'Bolter Joined: Nov 2014 Posts: 164 | All good points, thanks. I see it coming from near the bottom of the radiator. Off to the radiator shop.
~Denny 1953 Chevy 3100 w/1960 261 cid, 848 head | Weber 32/36 progressive 2 barrel carb. | Three on the tree & 3:55 torque tube | 12 V w/Gener-Nator & 6 V starter In the Gallery Forum1998 Chevy Suburban 350 ci awd/4wd | | | | | Joined: Mar 2004 Posts: 6,214 'Bolter | | 'Bolter Joined: Mar 2004 Posts: 6,214 | Check that the lower radiator hose is properly installed and not cocked and leaking fluid back onto the radiator. Mike B  | | | | | Joined: Oct 2021 Posts: 6,730 'Bolter | | 'Bolter Joined: Oct 2021 Posts: 6,730 | Be sure the radiator shop knows that this radiator is from a zero pressure system. You don't want him pumping it up to 15 pounds to find a leak. My truck has a 4 lb cap.
1950 Chevrolet 3100 (Ol' Roy)
1939 Packard Standard Eight Coupe (The Phantom) | 1956 Cadillac Coupe de Ville (The Bismarck) | 1964 Ford Galaxie 500 coupe |1966 Ford Mustang (Little Red) | 1969 Pontiac GTO (The Dishpit) I 1979 Ford F-100 | 1976 Ford F-150 (Big Red) | 1995 Ford F-150 (Newt)
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