I've got an overheating problem that has given me fits for the last two weeks.
I have an 86 FJ60 2f engine.
It overheats.
I have changed the thermostat after boiling it to make sure it works as it should. It's a 180F
I've replaced all hoses.
I've put in a new 4 core radiator and have checked with a garden hose and found no blockage.
It has a new heater core.
It does NOT blow smoke of any color.
I've done everything I can to make sure the system is free of air.
The water pump does NOT leak and the weep hole is clean and clear.
When it overheats, both heater core hoses get hot. The oil cooler hoses get hot. The top radiator hose gets hot.
Here's the part I can't figure out. The lower hose and lower parts of the radiator stay cold.
The lower hose will eventually get hot "ABOVE" the "T" where the heater core hose connects, but below that, the lower hose stays stone cold, even when my gauge reads 230 or above.
It's as if the radiator is blocked, but it isn't, I've checked.
I pulled the water pump off today and it looks really clean inside and the bearing is good.
I have checked with a garden hose to make sure that water circulates around the block and head, but that is sort of redundant because the head and block and oil cooler and heater core are the only parts of my system that do seem to circulate coolant.
I'm in the process of ordering a new water pump just because I've replaced everything else.
Any ideas??
I have an 86 FJ60 2f engine.
It overheats.
I have changed the thermostat after boiling it to make sure it works as it should. It's a 180F
I've replaced all hoses.
I've put in a new 4 core radiator and have checked with a garden hose and found no blockage.
It has a new heater core.
It does NOT blow smoke of any color.
I've done everything I can to make sure the system is free of air.
The water pump does NOT leak and the weep hole is clean and clear.
When it overheats, both heater core hoses get hot. The oil cooler hoses get hot. The top radiator hose gets hot.
Here's the part I can't figure out. The lower hose and lower parts of the radiator stay cold.
The lower hose will eventually get hot "ABOVE" the "T" where the heater core hose connects, but below that, the lower hose stays stone cold, even when my gauge reads 230 or above.
It's as if the radiator is blocked, but it isn't, I've checked.
I pulled the water pump off today and it looks really clean inside and the bearing is good.
I have checked with a garden hose to make sure that water circulates around the block and head, but that is sort of redundant because the head and block and oil cooler and heater core are the only parts of my system that do seem to circulate coolant.
I'm in the process of ordering a new water pump just because I've replaced everything else.
Any ideas??