Question about 1995 Honda Accord

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Idles up an down doesnt blow hot air no surculation in radiator

1995 honda accord 4 cyl v tec auto i changed thermostat an now it reves up and down and still blows no heat does blow warm but not like it should

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  • yadayada
    yadayada May 11, 2010

    sounds like either air in the cooling system or a blown head gasket.

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Did you get rid of the air in the coolant after changing the thermostat?
This is often not as simple as just topping it up.

Maybe unrelated to the hunting but it is easy to get an air lock in the heater system resulting in cool air.

These may be the simple diagnosis but..

If you had a blown head gasket then you should smell exhaust from the open coolant expansion cap (open it from cold and leave it open). Bubbles of exhaust will be seen on the water surface if blown.

Otherwise the general level will just SLOWLY rise as the water heats and expands. Note that this may rise to overflowing without the cap on.
Revving the engine will make it rise and fall a little. Sometimes bubbles of trapped air will find their way out when you rev but when cool, a blown gasket will really be definitive by smelling it closely..

If you have had a hot run with a blown gasket and pressure was allowed to build up in the coolant and then let it cool, the next time you start, the water will have squirted back into the cylinder(s) and you will get a cloud of steam from the exhaust.

A bit of a mix of clarification and solutions so let me know what you did!

Posted on Mar 12, 2009

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