My head is still spinning as I was investigating how bad my heater was blocked as no heat was coming from the unit when turned on and when feeling the heater hoses at the water pump / engine end they were hot but not at the heater core connection - I assumed that the heater core was blocked and considered removing the whole dash to replace. Yes the actuator works - as I pulled it apart and fixed - another story!
Then following others advice I removed the heater hoses to check the back pressure - but last time I removed the hoses at the water pump end as it was easier I thought and had no flow. No flow until tonight (my time, now it si 02:46 am as I had to finish) when I removed both heater hoses (at the firewall/heater core end) and discovered to my shock that each hose was plugged shut with a spark plug! Explains the lack of flow and I can't make this up.
We tested the heater core by pushing water in both directions and no obvious leaks in the cabin - we checked under each side and pulled back the carpet for some time and will check again in the morning.
Upon reflection I assume a previous owner did this to stop the transfer of heat into the cabin and make the AC work easier - Dubai summers get to 50 degrees C (122 F). And I discovered other oddities over the past two years including all HVAC vacuum actuators wired closed except the face vents - not sure why!
In a range of old Jeeps (TJs and XJs), I have seen the heater bypassed when the heater cores fail but that is usually just looping the heater hoses connections at the water pump.
Has anyone heard of a similar blockages in heater hoses?
Feedback welcome...
Then following others advice I removed the heater hoses to check the back pressure - but last time I removed the hoses at the water pump end as it was easier I thought and had no flow. No flow until tonight (my time, now it si 02:46 am as I had to finish) when I removed both heater hoses (at the firewall/heater core end) and discovered to my shock that each hose was plugged shut with a spark plug! Explains the lack of flow and I can't make this up.
We tested the heater core by pushing water in both directions and no obvious leaks in the cabin - we checked under each side and pulled back the carpet for some time and will check again in the morning.
Upon reflection I assume a previous owner did this to stop the transfer of heat into the cabin and make the AC work easier - Dubai summers get to 50 degrees C (122 F). And I discovered other oddities over the past two years including all HVAC vacuum actuators wired closed except the face vents - not sure why!
In a range of old Jeeps (TJs and XJs), I have seen the heater bypassed when the heater cores fail but that is usually just looping the heater hoses connections at the water pump.
Has anyone heard of a similar blockages in heater hoses?
Feedback welcome...