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Q: Car not blowing hot air when low rpms or at idle on 2005 Honda Civic

My 2005 Honda Civic is blowing cool air when at the lower rpm's or at idle....When excelerating or the rpms are increasing the air is blowing very hot! Also, the car is not overheating...I had the thermo replaced & coolant bled 2 times...any suggestions?
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check the coolant level first.
if it is low, you need to find the leak and repair it.
if it is ok, check the thermostat for operation.
make sure your cap is working correctly.
lastly, could be a restricted heater core.

You might have a bad head gasket. I had a similar problem and changed the thermostat. Coolant is leaking and seaping through the bad head gasket. You will need to replace the head gasket for sure.
I believe you may be right! After replacing the thermo., I was told I possibly had a blockage somewhere in the cooling system. I took it to Honda to get a power coolant flush, and they told me that it wouldn't help bc they believed that it was a head gasket issue! I was shocked and overwhelmed, the car is only 5 yrs old! Did you have to change your head gasket, and if so did it fix the problem? My fear is that I soak almost $1800.00 (honda's estimate) and it doesn't fix my issues! They told me that I had to get it pressure tested?! Thank you for your response!!
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