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Back pressure could be caused by a number of items.
1st...Bad system hoses (I recommend new ones)
2nd...Bad radiator Cap (this sounds superficial but it matters)
3rd...Leak in the upper radiator (these leaks are not always detectable)
4th...a leak in your heater core (Replace for $50.00)
5th...Air in your Coolant system, (requires purging/bleeding (at the water pump there should be a bleed valve and just past the thermostat)
6th...Leak in the intake (Mechanic needed)
7th...Head Gasket leak (Mechanic needed and $1100.00 dollars as well)
8th...Thermostste is bad and won't open (easy fix $20.00 do it yourself)
9th...Temp sensor is bad (even easier $15.00)
Hope this helps! Adam
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faulty pressure cap or center housing has rusted through to the outer seal ...
Coolant pushing out from radiator back into coolant reservoir?
it is normal, when the coolant is hot and pressure built, the pressure cap allows the coolant to drain to reservoir to reduce pressure in the cooling system But, if it continually does this whereby the reservoir overflows and the vehicle overheats due to a lack of coolant actually in the radiator when cool, there may be an overheating problem or blown head gasket on the engine.
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have the coolant system pressure tested to help diagnose your problem.
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when the engine is running and coolant will become hot to its operating temperature,the cooling system is under pressure,coolant will overflow and goes to coolant reservoir.when the engine goes cold coolant will go back to the rediator.
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Sounds like you may have a bad head gasket.It will leak exhaust into the cooling system and create alot of pressure
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pressure test the coolant system you will find a blown intake or head gasket
Why do you hear a gurgling noise from my car when I'm stopping?
The gurgling sound is caused by pressure in the engine coolant system(antifreeze) slowly releasing into the coolant overflow resevoir. Typically a faulty thermostat causes this sound.
What causes pressure to cooling system to force water into overflow reservoir?
Pressure in the cooling system can cause water to be forced into the overflow reservoir due to factors such as a faulty radiator cap, a blockage in the system, or overheating of the engine. When the pressure builds up beyond the capacity of the system, the excess coolant is released into the overflow reservoir to prevent damage to the system.
What causes a coolant reservoir to overflow in a 2001 Chevy Malibu during operation?
It could be a couple of things. The coolant system could be over full. There could be a clog in the radiator. Or possibly the thermostat but not likely. also, the ford coolant tank is pressure sealed, if the cap to the tank has a defective seal, it WILL overflow when you stop your car, or whenever the pressure builds
