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If the engine fan is working then you could have a defective thermostat or a blown head gasket.

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Q: What can be the cause of high pressure in the cooling system of a 2001 Jeep Wrangler 4.0L?
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What would cause too much pressure building up in the cooling system?

The usual cause of cooling system pressure surges is a bad head gasket. The compression from the cylinders gets into the cooling system and raises the pressure. Have a mechanic run a compression test to see if there are any big pressure changes between the cylinders.


What cause radiator hose to ge hard under pressure?

Internal pressure of the cooling system which is normally around 17 psi.


Why is your Jeep Wrangler overheating?

There are many reasons why a Jeep Wrangler is overheating. A leak in the radiator system will cause overheating. Too much pressure in the engine can cause overheating. A bad water pump or thermostat could cause overheating. The transmission can also cause overheating if it is leaking.


What would cause your radiator cap to blow off?

the radiator cap is a pressure regulating device if it is blocked for some reason the pressure in the cooling system could blow it off


Does the ecm control charging system on a 93 jeep wrangler?

Does the ecm control charging system on a 93 jeep wrangler and cause it not to charge the battery


What can cause high pressure in the cooling system of a Saturn?

High pressure in a car's cooling system might be caused by exhaust gases from normal engine combustion entering the cooling system. The exhaust gases might be entering the coolant due to a head gasket that is leaking, or perhaps even due to a cracked engine block. Note that under normal operation, cooling systems are pressurized due to the heat expansion of the coolant. However, if a fairly new radiator and/or hose has burst, or if the coolant hoses connecting to the radiator are rigid with pressure, this is abnormally high pressure.


What would cause an 1990 Acura Integra to overheat?

could happen if the thermostat is not opening, or if there's a pressure leak in the cooling system, insufficient cooling fluid, or a bad water-pump, a kink in a hose or blockage in the cooling-system. Anything that keeps the coolant from flowing in and out of the block or causes a loss of pressure. It isn't enough to just have coolant in the system, the sysem has to hold a head of steam as well. Otherwise the water will just get hot and blow out of the system.


What could cause the car to leak water if there are no signs of any leakage?

This normally indicates a head gasket failiure The water is leaking via the exhaust system A pressure check of the cooling system is advised


What will cause a dodge Dakota to overheat after changing the water pump?

Low coolant? Cooling system airbound? Low coolant? Cooling system airbound?


Can radiator cap cause overheating?

If the cap is not holding pressure or if it is damaged, the engine will overheat. The automotive cooling system must be pressurised, WHY?? its because when you pressurise the fluid, the boiling point will increase.


Can driving through puddles cause low oil pressure by cooling down the oil pan?

No


Will air pockets in the cooling system keep vehicle from starting?

No, but they can cause it to overheat