good morning to all. I have a JD 4230 with new circulating block heater. The in line is under the original frost plug heater and the top is towards the back of the head going in on top with a 90 degree elbow and 6 inch black steel pipe to bring it out to where you can clamp the hose onto coming from top of heater.. heater is mounted correctly as in upright position. The problem I am having is it air locks every time i plug it in. Last might was plugged in all night and this morning no heat into the top elbow. I crack the hose that goes onto the 6 inch black pipe and air hisses out for a bit then water comes and tighten up clamp again and the 6 inch pipe is hot in seconds. Why does it get air in the system every day????? How do I fix it???
- Thread starter cjunrau
- Start date
As I understand you, the outlet of the heater goes upwards to a fitting higher than the head, then drops down to the head.
Air bubbles rise so you have made an air trap.
Replumb it into the water manifold/thermostat housing area (BELOW the thermostat).
That being said, I hope you don't have a combustion products-into coolant leak that is bubbling gases into the coolant while the engine is running, some of which wind up in your "air trap"!
Air bubbles rise so you have made an air trap.
Replumb it into the water manifold/thermostat housing area (BELOW the thermostat).
That being said, I hope you don't have a combustion products-into coolant leak that is bubbling gases into the coolant while the engine is running, some of which wind up in your "air trap"!
buickanddeere
Well-known Member
idealy the coolant would leave , not enter the engine side of the thermostat , through a port on the thermostat housing or coolant manifold .
Cool collant can not be expected to rise and hot coolant can not be plumbed to drop.
Cool collant can not be expected to rise and hot coolant can not be plumbed to drop.
buickanddeere
Well-known Member
Out and down to the base of the heater from the highest point in the cooling system prior to the stat.
Into the lowest portion of the engine block coolant passage from the top of the heater.
I suspect the heater inlet and outlets were mixed up plus the attempt to try and make warm coolant flow downhill.
buickanddeere
Well-known Member
Woe, stop, oh crap, huge brain Phart, sorry.
Top port of heater to highest point in the cooling system on the engine side of the thermostat.
Bottom port of heater to the bottom lowest portion of the engine block water jacket.
Do not route plumbing to try and force warm coolant down or force cold coolant up.
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