Question about 1994 Jeep Grand Cherokee

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Radiator is backing up. the water is not going to the engine. engine is over heating and shutting off. ive replaced the radiator, water pump, and thermostat but the keeps coming back. i dont know what else to do

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Either you got the thermostat in backwards or are trying to run the pump backwards, otherwise there is serious blockage in the engine

Posted on Nov 13, 2009

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If the engine overheats from a thermostat
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I have a 2002 ford ranger that runs normal while engine is running but gets hot when i shut off engine


SOUND LIKE ENGINE OVERHEATING.USE A INFRA THERMOMETER ENGINE TEMPERATURE SHOULD NOT EXCEED 104 CELSIUS WHICH IS 220 DEGREES IF ENGINE EMPERATURE GOING OVER 230. THERMOSTAT STICKING PARTIALLY CLOSED,WATER PUMP FAILING CHECK WEEP HOLE IF LEAKING REPLACE WATER PUMP.FLUSH RADIATOR ,HEATER CORE, AND ENGINE BLOCK. MAKE SURE YOU HAVE 50 / 50 ANTI FREEZE AND WATER.MAKE SURE ENGINE EXHAUST NOT STOPPED UP BECAUSE EXHAUST SYSTEM ALSO TAKE HEAT AWAY FROM ENGINE.

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I have 2001 alero. Yesterday the coolant light came on and the engine just died. Any ideas maybe fuel pump or timing belt or could it be the water pump


IF LOW COOLANT LIGHT CAME ON ENGINE SHUT OFF BECAUSE IT GOT TOO HOT AND OVER HEATED.WHEN YOU HAVE LOW COOLANT.YOU COULD HAVE LEAKING RADIATOR.YOU COULD HAVE LEAKING RADIATOR HOSES AND WATER PUMP. ADD MORE COOLANT IN CAR RADIATOR UNTIL YOU AT FULL COLD MARK ON THE OVER FLOW COOLANT TANK START THE CAR LET IDLE UNTIL ENGINE GET OPERATING TEMPERATURE.RAISE YOUR HOOD LOOK FOR LEAKS THE RADIATOR PRESSURE WILL PUSH COOLANT OUT WHERE LEAKS COULD BE.LOOK AROUND RADIATOR AND COOLANT HOSES.LOOK AT WATER PUMP.IF YOU SEE COOLANT LEAKING AT WATER PUMP REPLACE IT.

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1 Answer

Engine gets hot but radiator and coolant still cool


Your thermostat is probably stuck shut. When the car is cold, open the radiator cap and fill the radiator to where you can see the coolant. Start the car and have a friend watch the gauge rise as you watch the coolant. At a little before or right at half way the thermostat should open and you should see the coolant drop. At this point the car should also have heat. If you can not see the coolant drop it can be one of 3 things.
Thermostat stuck shut water pump is bad blockage in radiator or cooling system.
Heres what I would do to rule out water pump 1st. Disconnect the line that goes from the water pump to the engine from either side, the pump or engine. back away and start the car. You should see coolant coming out of the water pump. if you dont try to put water into the hose to make sure the water pump has water in it. It could be empty if the pump is after the thermostat and it is stuck shut. If the water pump has water in it and nothing comes spraying out when you start the car, the pump is bad. If it does come out you need to remove the thermostat and push against the wafer in it on the opposite side of the spring and see if it moves. If it does not moves (wont be easy) the thermostat needs to be replaced.

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1 Answer

2000 dodge durango cooling issue: I HAVE THE 5.2L 2WD. I have replaced the water pump, thermostat 3 times, hoses, fan clutch. To begin with ive had it tested at three places no one can figure out why...


Ihave a 2000 Dodge Durango i have put a new radiator and the gaskets came back good um i replaced the coolen fan also the thermostate and tested it it it came back good when i run it its fine but when i am in line its hot when i drive it cools down........

Aug 18, 2010 | 2000 Dodge Durango

2 Answers

Engine overheating, 2000 deville


The problem is that more heat is entering the water than is being extracted by the radiator.

But there can be a lot of causes for that. If you have a head gasket leak, it can introduce hot gasses into the water, increasing the heat load while raising the pressure in the cooling system. That in turn can push water out of the cooling system, and into the recovery reservoir, where it can't help with the cooling of the engine.

If the fins of the radiator are blocked or folded over, that part of the radiator will not contribute much to the cooling.

If the internal water passages of the radiator are blocked, the area of the radiator is effectively reduced.

A worn out bottom radiator hose can collapse from the suction of the water pump, blocking the water flow.

If the fuel mixture is too lean (not enough fuel in the given volume of air) the engine will generate quite a bit more heat, possibly overwhelming the system.

When the engine is cold, the thermostat (a valve in the hose where water exits the engine to go to the radiator) is closed. This prevents water from going to the radiator, and that in turn prevents water coming from the radiator to the engine.

Water instead leaves the engine through the heater hose near the upper radiator hose, and circulates right back to the inlet of the water pump. So the water circulated through the engine, but it has no way to shed any heat it picks up. This speeds up the warm-up process.

The water circulating this way passes by the back of the thermostat, causing the thermostat to warm up along with the water.

When the thermostat reaches its opening temperature, it starts to open, allowing some water to go out of the upper hose to the radiator, and therefore some water from the radiator to enter the engine.

Right away, the water in the engine falls below the opening temperature of the thermostat and it closes.

The newly cooled water gets warmed by the engine, raising it to the opening temperature of the thermostat, and the whole process begins again. But this time, the water coming from the radiator is just a little warmer.

Eventually, the thermostat will stay at a partially opened position where the cooling by the radiator just matches the necessary heat loss through the radiator.

If there is not enough water, the surface area of the radiator is effectively less.
If the radiator is blocked, or the fan is not working properly, the surface area of the radiator is effectively less.

If the thermostat doesn't open properly, the radiator is not sufficiently utilized.

If too much heat is generated by the engine, it can over heat (heavy load at low speed will make a lot of heat without spinning the water pump fast enough, for instance).

These are a few preliminary tests to see what's going on. With a stone cold engine, start it and let it idle. The heater hose leaving the thermostat area should begin to heat up but not the upper radiator hose.

Once the heater hose starts to become uncomfortably hot, the upper radiator hose should start to warm up, slowly at first.

If the heater hose does not heat up, there might be insufficient flow throw that part of the system.

There is a quick check a shop can perform to see if you have exhaust in the water. There is a syringe they can use to draw the vapor in the radiator through a sensing liquid. If it changes color, you have a head gasket leak.

The radiator cap only need to be replaced if it is letting the coolant move into the reservoir improperly. If you coolant level remains fine, that is probably not a problem.

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2 Answers

Aloha,have 98 base mustang, overheating after many replacements


i would change the water pump and check for plugs in the heater core

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