![]() ![]() Good news - The rad is LEAK FREE! I warmed up the engine (electric fan turn on), the coolant level in the reserve tank increased (by like 1/2"), the engine warmed up fast, there are no visible leaks anywhere. Though it is completely normal to find bubbles in the overflow tank while the engine is not overheating, bubbles in the coolant could be the sign of a leak at. Then I went for an easy drive and took this video as soon as i came back. I just did a compression test and it came up fine, 140 all across. Temp is fine and bottle levels normal, no coolant consumption either. ![]() Update: I just installed the used radiator (6/7/16). Save Like Franko Discussion starter 3 Re: Bubbling in overflow tank after shutdown. To avoid buying a new radiator (at $425) I bought a used one on eBay for $75. As soon as the cooling system developed pressure during initial engine warm up, the hot pressurized coolant spewed right past THREE LAYERS of cured epoxy. I tried epoxy (which would adhere to the uncorroded outside surface of the tank). ![]() ![]() I thought about solder, but there was SO MUCH internal corrosion (due to neglect from the PO), I didn't think solder would work. The pin hole was near the TOP of the rad so the leak was hard to notice. The system couldn't drink from the overflow tank because it was sucking in air through the pin hole. This explains the bubbles and mysterious loss of coolant! I discovered a pin hole leak in the radiator today (5/31/16). Is this ALWAYS an indicator of a leaking head gasket, or is there a less expensive & simpler solution? There are no visible coolant leaks anywhere. Is the fluid level on the overflow bottle moving from the COLD line to the HOT line when you run the car When the car is left sitting overnight, the air. I then noticed a small stream of bubbles within the coolant in the overflow tank.Īlso, the level of coolant in the reserve tank does not increase & decrease with thermal cycling of the engine like it should.Īlso, there is a mysterious loss of coolant (only about 2 cups) over 3 days of riding. If you see overheating in addition to that symptom, there may be exhaust gases from a leaking cylinder head gasket finding their way into the cooling system.I have a recently purchased 1996 Honda ST1100 (standard) with only 45,000 miles.Īfter a long hard test ride tonight that included a mixture of high & low speed, I shut of the engine & inspected the bike with a flash light. Possibly a bad radiator cap, or unclamped radiator hose. If you find that a cold radiator shows air at the top of the radiator but the reserve tank has coolant in it, there may be a vacuum leak in the system. You should then see the reserve tank level drop somewhat after cooldown. So after coolant has been drained, you should replace it by filling both the cold radiator and the reserve tank completely full. But if there's too much air in the system, it's hard for the "push air out suck coolant in" routine to work. A few cycles of that should get rid of all the air in the radiator. When the engine cools down, it should suck coolant from the reserve tank back into the radiator to replace the lost air. When the car warms up, any air in the cooling system expands, bubbles to the top of the radiator, is pushed into the coolant reserve tank, bubbles to the top there, and then flows out to atmosphere. When cold, the radiator should be full to the cap. ![]()
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