Check the radiator-it may have blockage. Take it off and turn upside down and flush from the bottom.
If the top hose gets hot, that means the thermostat is opening. The bottom hose should be at least warm, and quite warm if radiator flow is good.
F your engine is overheating, Try this procedure:
SOURCE: mazda bongo 2.5 turbo diesel 1996. over heating
no im a mechanic it sounds like that you have an air lock in the cooling system .i am familiar with ford freda and bongo and the design where the engine is is a bit far from the radiator ,so the problem with air locks magnifies.really the solution is just drain the water and refill it slowly while you are pressing and releasing,just repeat the action on the top radiator hose to get rid of any air trapping within the system,it's as simple as that really.you want it to have just water and no air as this will cause a blockage.
SOURCE: My Mazda MPV 1995 is
Nornally the hose will warm up but not hot with a circulating system. the therostae could be installed upside down or be bad. You should install a therostate with a asprin holding it open to circulate the coolant till the cooling system is full and the asprim will disolve as it soaks in the coolant. the air will ciculatre to the top and out and the systrem will be full. the stat will work corectly after the asprim is gone. with air around the stast it might not open and therefore overheat.
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