Joseph80
New Member
Hello everybody!
I'm new to Honda absolutely, just bought my Civic 1.7 CTDI a month ago.
From the very first time I had heating issues so I started looking for the root cause.
The symptom: when engine is idle no warm air blowed. As soon as I start revving and it goes above 2000/min the air is warming up and heating works like charm. Then I lower the speed or stop and heating is gone very soon.
What I did so far: brand new quality thermostat installed, checked if heating valve was working, washed the heater core 2 times (reverse as well), descaled the heater core with citric acid put into warm water, checked if the hoses are not bulged, made sure no air bubble left in the system
Result: zero
I've read through several comments in forums but in most case the idea was to change the T-stat, unclog the heater core, remove air bubbles.
Been there done that.
I'm wondering if this could be the result of a faulty water pump? Theoretically if this is failing somehow maybe the circulation of the coolant would be poor. With revving also the rev of the pump rises. But maybe I'm wrong.
The question is if there is any other element of the heating system could be failing here? Maybe some electric component? I'm really out of ideas. Would be thankful for every new advice.
I'm new to Honda absolutely, just bought my Civic 1.7 CTDI a month ago.
From the very first time I had heating issues so I started looking for the root cause.
The symptom: when engine is idle no warm air blowed. As soon as I start revving and it goes above 2000/min the air is warming up and heating works like charm. Then I lower the speed or stop and heating is gone very soon.
What I did so far: brand new quality thermostat installed, checked if heating valve was working, washed the heater core 2 times (reverse as well), descaled the heater core with citric acid put into warm water, checked if the hoses are not bulged, made sure no air bubble left in the system
Result: zero
I've read through several comments in forums but in most case the idea was to change the T-stat, unclog the heater core, remove air bubbles.
Been there done that.
I'm wondering if this could be the result of a faulty water pump? Theoretically if this is failing somehow maybe the circulation of the coolant would be poor. With revving also the rev of the pump rises. But maybe I'm wrong.
The question is if there is any other element of the heating system could be failing here? Maybe some electric component? I'm really out of ideas. Would be thankful for every new advice.
Last edited: