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June 14th, 2002, 06:38 PM
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Bubbles in overflow tank
When I return from driving the GN I see what appears to be the remains of bubbles in the overflow tank. When I watch the tank with the engine idling, I do not see any bubbling action. The oil looks clean and so does the water in the radiator. Is this an indication of a head gasket going or nothing to be concerned with? I still have the factory head gaskets. Thanks.
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Jim: 87 GN with: TE-61/PTE .63 housing - ported stock heads - Erson 208 cam - Speed Pro forged pistons - PTS trans. & 9/11 converter - MSD 60# - CAS V-4 - 3" DP - ATR 2.5" exhaust - 62 JJ TB/stock plenum - RJC power plate - Gen II w/LS-1 MAF/PL - SMC progressive alcohol - Walbro 340 - and Extender G chip with 26*/22* timing. Best 1/8 mile run: 6.904 @ 100.04 with 1.535 60'.     
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June 14th, 2002, 09:01 PM
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I just had the same problem. Now I have the motor out because of a blown head gasket. Be careful.
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From 1986 GN to 1970 GS back to a 1987 GN and back to a 71 GS (clone) Hey, at least I stayed with Buicks!!!
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June 14th, 2002, 09:08 PM
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To check for a blown HG start the engine when it is cold and remove the radiator cap. Let it warm up to the point that the thermostat opens and if you see little bubbles coming get your toolbox out.
Some cars may bubble into the o/f simply from being hot after shut down, but I dont think its normal on a well tuned car with a good cooling system. If your radiator is so so and the fan does not work right then it might just be your cooling system
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Bob D .040 over block - n/a crank - hypers stock turbo/IC/blue tops Yes, I am an alcoholic http://bobdittmar.tripod.com/blown87combobs1987buickgrandnational/index.html
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June 14th, 2002, 09:32 PM
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If there are only "remains" of bubbles in the overflow, it could simply be that the coolant has been sucked into the radiator, leaving bubbles. This is normal with a hot motor-the radiator expands and more coolant is sucked in from the o/f. When the motor/radiator cools the excess coolant flows back to the reservoir. This is why there is a cold fill line-it should look low when hot. Check if the o/f fills up upon cooling.
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June 15th, 2002, 08:51 PM
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I wouldn't worry too much then. I think there are surfactants in the RMI and that results in the "soapy bubbles". Otherwise, take it to a shop with a cooling system pressure tester. They can check the system and the cap for leaks.
Mike
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), ever since I started mixing the RMI in.
Linear Mode
