Question about 2001 Jeep Grand Cherokee

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Water will not circulate changed thermostat water pump and. Radiator

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One of two things comes to mind thermostat in backwards (needs to be spring side towards the engine) or if it has a serpentine belt you could have the pump running backwards check the diagram under the hood on the belt

Posted on Mar 21, 2011

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What would cause antifreeze to come out of the overflow of the reservoir?


Remove radiator cap when car is completely cold. Refill radiator look to see circulation when cap starts turn heater high. When thermostat opens water will be drawn from overflow into radiator. If this does not occur faulty thermostat is probable cause if no circulation change water pump. Refill water to correct levels and car should run correctly

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If the engine overheats from a thermostat
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1997eldorado Cadillac after 20 minutes water is boiling in the water tank I changed the thermostat but no help it seems like the thermostat didn't cycle thru. Fans are working no water in oil or in...


From what you describe, it sounds like your water pump is not circulating the water. But it doesn't sound like you have a blown head gasket or a cracked block at this point. But if you continue to drive the car, that could change.

Do you seem to have good circulation through the radiator normal? Sometimes, the radiator will get gunked up, and then very little coolant can get through it. Which is a possibility, but I would still suspect the water pump first.

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I am having the same problem with my 94 sunfire. changed thermostat. flushed and cleaned radiator replaced coolant. no cigar. any ideas. mechanic says could be water pump but he cannot be sure and it is...


To see if it is your water pump - remove the radiator cap and start your vehicle while it is cold. the water should not circulate due to the thermostat being closed. When it is warm, the coolant should be seen to ciculate as viewed through the rad cap opening. (be sure there is lots of coolant - of course) Also if there is no thermostat - the water will circulate after the engine is started wheather hot or cold if the water pump is working. You say it is a new thermostat so I assume it is not stuck closed.

Nov 19, 2010 | 1996 Pontiac Sunfire

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96 nissan altima with ne water pump and thermostat


1. Improper water circulation: Sometimes, eventhough you are sure that you have enough water on your radiator, your car still overheats. It might probably be that the water is cannot circulate properly, which results to improper cooling process. There are several reasons for this which you can discover by yourself. To verify if the water circulates properly, start your engine without the radiator cap. If water circulation is good, you should notice that the water pops smoothly over the top but still retains the amount. Another way to check, detach one of the ends of your radiator hose from your radiator and see if water flows continously over.
If water doesn’t circulates well, check the thermostat if it’s open. It should be open, meaning clean, and the water can pass through it.
If thermostat is clean and still the water doesn’t circulate properly, then you have to check the water pump. That’s probably where the problem is. A little leak on the pump will cause improper flow of water through the radiator system.
If you are sure that the problem is not about water circulation, another thing you can consider is check the engine oil. Very low amount of oil can cause greater friction of the mechanical system of your engine. If it’s not time to change oil yet, you can add over some amount of oil until advisable amount is reached.
While we can’t be always sure about our engine, especially if it’s not new, we should be prepared when it happens. Bringing extra gallon of water in your trunk will surely help.

Jul 28, 2010 | 1996 Nissan Altima

2 Answers

Car is overheating, thermostat was changed and the radiator was flushed, car does not overheat while idoling, but when you start driving it overheats


It sounds like water pump may be your problem. It circulates a 50/50 mixture of glycol (or some form of) and water through the engine block and cylinder head and back through the radiator. In the radiator the mixture is cooled when air passes over the fins of the radiator. This is accomplished by driving or a mechanical/electrical fan when stationary. The water pump also circulates the mixture through the heater core giving the car heat. If the water pump is not circulating the water back to the radiator to cool, it will overheat. More heat is caused by the engine when driving (much less heat when idling), hence the overheating while driving.
I hope this helps and good luck!
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OVERHEATING..THERMOSTAT OR WATER PUMP? M REG ESCORT.1600


dear friend:i think we should start with pressure testing the system for water leaks,if there is leaks you will loose pressure,if you reach working temp feel the top and bottom radiator hose,they should be the same temp,if not then the thermostat is faulty,if you got poor circulation then it can be the waterpump or the radiator is blocked,check airflow threw the radiator,check radiatorcap pressure,

Sep 19, 2009 | 1998 Ford Escort

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Coolant is not ciculating and not leaking it is blowing back in can i had new hose and thermostat housing put on is it air locked?


When engine is cold, take out the thermostat. Put back everything add water as needed to the radiator, leave the radiator cap out. Start the engine be careful stand in front of the radiator and where the radiator cap goes watch if the water is circulating rev it slowly and the water should circulate faster. If it is not circulating the radiator maybe clogged, inside the cylinder head where coolant circulates might be clogged or the water pump is not working.

Jul 15, 2009 | 2001 Ford Focus

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Water is not circulating in radiator. Engine is running hot.


sounds like the thermostat. the thermostat lets the water flow from the block to the top of the radiator.

Mar 20, 2009 | 1992 Nissan NX

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