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most likely air in the colant system, an air bubble trapped when water pump was replaced. An eazy way to tell if air is in the coolant system squeze the upper radiator hose, if seems empty or can hear coolant swishing around, then there is air in the coolant system and also coolant level not compmetely topped off.
Top off coolant with Antifreeze Concentrate, NOT WATER. water will boil and evaporate, 50/50 antifreeze mix is good but if you dont know how much water has allready been added to the coolant system then straight shots of Antifreeze is recommended when toppong off coolant level.
Remove Air and Top Off Coolant
•While Engine is cool •Remove radiator cap •Slowly fill to the rim with Antifreeze, while at the same time squeezing the upper radiator hose to swoosh around coolant, try to get as full as you can. •Replace Radiator Cap •Start engine and switch air fan on high •Remove radiator cap •Squeez upper radiator hose and add more Antifreeze as Nessesary •Notice preasure on the coolant hose, while adding antifreeze Concentrate preasure on the hose will stiffin up, When coolant is full turn off the motor.
Out the exhaust pipe. Check the radiator for bubbles. Fill it up to the neck, run the engine to warm it up, give the top hose a couple of squeezes to clear any air from the system. Any continuing bubbles at the filler means a leaking head gasket. Also check the oil for any water.
If there is no sign of a leak you need to test for cylinder head leaks.
Warm up the engine and remove the radiator cap. Top up the water to the neck of the filler. Squeeze the top hose a couple of times to shift any air in the top tank of the radiator. Run the engine on idle and check for bubbles it the radiator, keep it topped up to the neck. Bubbles showing means you have a head gasket problem.
When the van is warmed completely check the top radiator hose by squeezing it together. If you can squeeze it without any resistance replace the radiator cap. The coolant is not circulating properly and can keep the heater from working. If you cannot squeeze the hose together than you may have a bad water pump. The water pump has fins inside of its' case. Those fins may be rusted completely off to where the water cannot circulate. You can check the circulation by feeling the top and bottom hose coming off of the water pump to the radiator. Both those hoses should be the same temp. If not I would consider changing the water pump.
FIRST DON'T EVER PUT WATER INTO YOUR ENGINE OR ANY OF ITS COMPONENTS. What you looking at is the Coolant resivour and your low. buy some 50/50 prediluted coolant and fill to the COLD line if the engine is cold, HOT line if you just turned your car off. Also wait until your engine cools and check your Radiator to see if you have enough coolant. If not, fill coolant to the opening neck, SLOWLY squeeze the top radiator hose until the coolant starts to almost spill out. top off to the top of the neck again and run your engine for 15 minutes and then allow to cool and check the level again.
Build up in the coolant system a faulty Sensor reporting that the engine is hot when it is not. You can try running a coolant flush through the system to remove that possible problem. If you are basing this overheating problem on coolant being forced out the over flow, do a compression check on the cylinders. If one or more of the cylinders is running extremely high compression you may have a faulty head gasket, cracked head or cracked block.
Should the 2 hoses from the radiator. Top hose from radiator to head, 2nd from radiator to block slides onto the thermostat housing. If you have a 2nd fan that could also have 2 hoses to cool the automatic system. When filling up the radiator - it goes through that into the bottom pipe - into the thermostat housing - around the engine block - into the heater - back through the engine block & out the top hose back to the same cycle. DON'T forget that when you have lost water as you have keep the radiator cap off & let the radiator burp until all the bubbles come out. Sometime you may need to help it by squeezing the hoses, being careful when the engine gets hotter. Good luck
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