Question about 1993 Honda Civic 4 Door

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My cars heater is not working, I have recently replace the Coolant, and the thermostat, and am not sure what to look for next. This is a 1993 Honda Civic CX 2 door hatchback.

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  • David Johnson
    David Johnson May 11, 2010

    look for the valve that opens and closes to allow circulation to your heater core. Hope this helps you find the problem.

  • spic73_08
    spic73_08 Dec 25, 2012

    try your fuze



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First check to see if the hoses to the heater core are hot. if they are not hot do the following.
Check the valve where the heater core hoses go into the cab, if the valve is good , you may have to wash out the heater core by removing both hoses at the firewall and run some water through the heater core until the water comes out clean of rust and debris.

Posted on Dec 16, 2008


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1992 Honda Accord cooling problems--Please help!

I smell a bad water pump.. If your water pump is bad you get very poor coolant circulation not to mention at a stand still(red light) you get less air flow to cool down the coolant. Since you have poor coolant circulation you wont get the proper coolant to heater core as well so you get less warm air threw heater. Not to mention that when a water pump is faulty and you have a thermostat it allows even less coolant circulation compared to a constant flow of antifreeze. I would have it checked. Good luck

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This valve allows hot coolant to enter the heater core inside the car. If this hot coolant doesn't arrive, you have no heat.

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Radiator flushes can cause more problems than fix sometimes. Before you go removing the dash first replace the thermostat if you follow the lower radiator hose to the engine this is the thermostat housing.Remove the three 10mm bolts and the housing should come apart. Make sure you put the thermostat in the right way and not upside down. The larger end with the spring goes in first toward the engine and the little vent should be on top. When you fill it back up with a 60/40 mixture of coolant make sure you open the bleed hole on the thermostat housing to get out any air and tighten when coolant comes out with no air bubbles. Start the car and hopefully the heat is better. If not the heater core is the two coolant hoses on the firewall remove both hoses and check the flow with a water hose put the hose to both sides to get out any debris. If the flow is slow and does not improve you will have to pull out the heater core which means removing most of the lower dash pulling out the evaporator if you have A/C. Make sure you get a manual. Hope this helps.

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