Yesterday I did a drain and fill of my 2006 Accord sedan's coolant. It's an EX with leather, 4 cylinder, stick shift.
After the fill I had the engine running, it got up to temp, fans on, and then I switched the HVAC to Hi heat. No heat. Cold air out all the vents regardless of temperature setting, what vents selected, driver passenger side mix. I haven't run the heat since last winter when it worked fine.
The car gets up to temperature fine and the thermostat behaves as expected. I did a bit of research and found some info on the heater control valve, which is the valve that opens the flow to the heater core. This is opened and closed by a wire that I gather is actuated by something under the dash, perhaps the blend door motor?
Speaking of that blend door motor, I replaced it last spring as it was doing the back and forth hunting with grinding sounds. It fixed that problem but I do occasionally still get the behavior where it'll blend in more hot or ambient air that it should for a given temperature. I can "solve" this by setting the temperature low and slowing bringing it back up. I dunno if all of this is related
I cycled the temp from Lo to Hi and noted that the cable doesn't move and thus neither does the heater valve. It is stuck at about 10:30, which I gather is half open half closed? I tried moving it either way with my fingers but could not get it to move with moderate force. Likewise the cable is on there pretty good and wouldn't come off with a moderate tug.
Any ideas?
jeff
After the fill I had the engine running, it got up to temp, fans on, and then I switched the HVAC to Hi heat. No heat. Cold air out all the vents regardless of temperature setting, what vents selected, driver passenger side mix. I haven't run the heat since last winter when it worked fine.
The car gets up to temperature fine and the thermostat behaves as expected. I did a bit of research and found some info on the heater control valve, which is the valve that opens the flow to the heater core. This is opened and closed by a wire that I gather is actuated by something under the dash, perhaps the blend door motor?
Speaking of that blend door motor, I replaced it last spring as it was doing the back and forth hunting with grinding sounds. It fixed that problem but I do occasionally still get the behavior where it'll blend in more hot or ambient air that it should for a given temperature. I can "solve" this by setting the temperature low and slowing bringing it back up. I dunno if all of this is related
I cycled the temp from Lo to Hi and noted that the cable doesn't move and thus neither does the heater valve. It is stuck at about 10:30, which I gather is half open half closed? I tried moving it either way with my fingers but could not get it to move with moderate force. Likewise the cable is on there pretty good and wouldn't come off with a moderate tug.
Any ideas?
jeff