1999 Honda Civic Heater Not Working

Asked by Jan 22, 2017 at 11:16 PM about the 1999 Honda Civic LX

Question type: Maintenance & Repair

I have a 1999 Honda Civic. Mechanically
the car is perfect but the heater doesnt
work. It blows air just fine but it'll be comd
air. I had the thermostat changed and filled
the antifreeze and it git warm for a minute
or two but then went cold in a few minutes
and hasnt got warm ever since. The car
doesnt overheat at all. I dont know how to
figure out the problem and want to see if
theres anything else i can do to fix it myself
before i take it to the shop abd have to
waste money on it.

3 Answers


assuming that you bled the air out of the system, find the heater hoses and check their in/out temperature

Same problem hear hoses are both not What do you think problem is eating me

Civic's engines are heat deficient, especially as they age. They just suck at making enough hot coolant in the winter especially if you're stuck in slow moving traffic or the car is parked. I flashed the system, separately heater core, checked thermostat, OEM coolant and not much of improvement. On the other hand 01-05 are known as head gasket blowers. Old Toyota Tercel also sucked in the winter until Toyota developed Echo-Yaris engine which IMO is one of the best small engines. So, engine block heater might be good addition to have the engine warm after cold winter night and reduce warm-up time in the morning. Make sure that flaps in the air box and heater coolant valve work properly, '99 up have electric motor for moving the flap doors.

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