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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
Wiki User
∙ 13y ago
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faulty pressure cap or center housing has rusted through to the outer seal ...
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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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pressure test the coolant system you will find a blown intake or head gasket
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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
