After a long drive or continuous use I've noticed that the radiator hoses have compressed significantly. When I remove the radiator cap, the hoses decompress and turn back to their normal shape. Radiator fluid is normal in terms of level and colour and there aren't any leaks showing up in the pressure test. The reserve continues to stay level as well.
They will compress when the engine cools off, but if they are doing that a lot, I would replace the radiator cap. Make sure you have the right one, the pressure must be correct on it. This is an item you should probably get from a Honda dealer.
A restriction (usually the thermostat) causes the water pump to pull water from the radiator. But with less coolant flowing out of the engine, it creates a vacuum in the radiator which collapses the hoses.
SOURCE: 1999 honda civic si
You need to compress and turn the piston at the same time for it to work.
SOURCE: honda civic 1994 low compression
That would tell me that I had to replace a leaking head gasket. Hope this helps.
SOURCE: Honda civic type r sounds low on compression an
If the engine cranks but seems like no compression, do check the timing belt. As the belt might have given way or snapped. You have to remove the top crank case cover and black side cover to check the timing belt. Enjoy it
SOURCE: Is a compression test a
Check for milky oil
It may help to have the radiator cleaned and flushed, and a new thermostat installed, the coolant may be going out the overflow
Not certain how it ruins radiator caps, they hold about 5psi in the radiatior and let excess pressure into the overflow, then when the engine cools, allow coolant to s uck back form the overflow tank
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