I have a 92 Civic 1.5. If I open the hood (bonnet), leave the radiator cap off and run the motor slowly, small bubbles appear in the radiator cap aperture (Not in the expansion bottle). So, thinking this was a sign of a blown CH gasket (and there was also some pressure buildup in the hoses), I had the head skimmed. At the same time, I had all hoses, radiator, rad cap and thermostat replaced. But after skimming, the bubbles are still there. My mechanic seems to think this means I should now have the engine block skimmed, I think because of the danger of pressure building up in the hoses from said bubbles. But another mechanic I spoke to for a second opinion said all Civics blow bubbles (something to do with being a =93high-pressure system=94). Does anybody know if all Civics blow bubbles under normal conditions? There is absolutely no sign of oil in the water, or water in the oil, or white gunge under the radiator cap (noted from another post to this forum). Water usage is very small but I am not sure if it is significant =96 about 1 cm on the expansion (overflow) bottle after a
400 kms hard (fairly high revs) drive. I am not sure how much water such a system should use =96 the overflow bottle was correctly filled to MAX but not beyond in order to leave enough space for expansion, so presumably in theory the cooling system should not use any water at all, as it is not open to the atmosphere, but does practice match the theory? The temp gauge does not budge from normal. Any comments much appreciated.- posted
15 years ago