Question about 1990 Honda Accord

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Heat core No heat blowing out from heat core. I do not see any leak problem

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More often than not the problem is a thermostat that is stuck open, causing heater output to take a very long time to heat up. Replacing the thermostat is as follows:
Disconnect the negative battery cable (if you have an anti-theft radio, make sure you have the code).
Drain the cooling system (petcock bottom of radiator)
Follow the top radiator hose back to where it connects to the engine.
The part with the two bolts in it that the hose connects to is the thermostat housing.
You may have to remove the hose in order to remove the housing.
When you have removed the housing, note the position of the thermostat before you remove it.
When installing, use new gasket, etc.
(you might be able to get away with not removing the radiator hose, but it is recommended)
Be prepared for a bit of spillage when you remove the housing.
Hope this helps you.

Posted on Nov 14, 2009

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When I put the heat on in my car it blows warm air for a few seconds then goes to blowing out cold air.


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Runs hot and hearter not blowing hot air


a heater uses the temperature of the cars water, running threw a heat exchanger if the heater core has failed water will not circulate threw the engine properly this will and can cause over heating as well as nothing blowing from the heater. good luck.heater cores are generally inexpensive parts to replace.

last thing you can check if heater core is ok. is the thermostat.

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