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Is it too full? Well some vehicles are equiped with a little hose that will let coolant out if there is too much or too much pressure, but not all vehicles will have it. (If you are talking about the overflow tank, if the radiator cap is leaking, check to see if the cap is in good condition)

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โˆ™ 2005-12-31 04:46:31
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Q: What is happening when the coolant reservoir is overpressurized and starts leaking from the cap Is this a thermostat problem or cooling fan switch problem?
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Related questions

Why is coolant bubbling in reservoir tank?

thermostat is stuck shut

If the coolant reservoir is being sucked out of the reservoir could this be a bad thermostat?

No it probably means you have a leak some where. Try pressurizing your system to find the leak.

Where is the coolant sensor on a 2001 Mercury Sable and is it possible to replace it without replacing the entire coolant reservoir?

NOTE: this answer is describing the location of the engine coolant temperature sensor - NOT the coolant sensor in the reservoir that warns when the level gets too low.The coolant temperature sensor is located directly adjacent to the thermostat housing. The thermostat housing is what the upper radiator hose (toward the right side of the engine compartment) connects to. You do not have to replace the reservoir to replace this part, but leaky coolant reservoirs are a common problem on this model.

What causes coolant to backup and spill over in the reservoir until its all gone?

the reason why the coolant is spilling up over the reservoir is because the thermostat needs to be replaced because when the engine needs water the thermostat heats up from the engine and causes the springs to expant which opens a seal to allow the water throughout the engine i just realpaced the thermostat in my volkswagen

The coolant starts to boil shortly after starting the engine. State the fault indicated and how you would diagnose the fault?

Coolant not being circulated through the radiator/radiator fan subsystem. Most probably the thermostat is malfunctioning. Two ways to test this fault: (1) Coolant accumulates in coolant reservoir. (2) Remove the thermostat and immerse in boiling water; if thermostat does not open, replace unit.

How can you tell if the thermostat is going out?

Vehicle takes an excessive time to attain normal operating temperature Heat not HOT with coolant full - thermostat not closing properly Vehicle heats up too soon - No heat with coolant full Coolant boils out of reservoir or top of radiator - thermostat not opening

How do you get windshied washer fluid out of the coolant reservoir?

Remove the coolant reservoir, flush it out, reinstall it and refill with proper coolant.

How do you change a thermostat on a 2003 dodge neon sxt?

To change the thermostat on a 2003 Dodge Neon SXT, first remove the drain plug to let the engine coolant drain into the pan. Unhook the coolant reservoir and remove the hose clamp. Spray the two thermostat housing mounting bolts with a solvent and pull out the old thermostat.

Where is a 1997 Jetta Coolant reservoir?

The coolant reservoir on the MK3 jetta is located against the firewall. It is a small round reservoir.

Is it normal for coolant water to go into the reservoir?

Yes- coolant reservoir is designed to accept excess coolant - As coolant heats up it will expand and flow to the coolant recovery tank (reservoir) and as it cools (contracts) it will be sucked back into the radiator

Why is Coolant is full and engine overheats coolant is boiling in reservoir?

Tough to narrow it down with such little detail, but it sound like your car's thermostat may be malfunctioning and not controlling the temperature correctly.

Reservoir light popped up on your 2007 dodge charger why is that?

Reservoir light? You mean low coolant light. Low coolant level means the reservoir is low of coolant.

Why does Overflow Reservoir on 1999 Ford Taurus keep overflowing gauge doesn't read hot changed the hoses flushed Radiator replaced Thermostat and reservoir?

It sounds like you have a blown head gasket. Combustion gases can enter the cooling system through either a blown head gasket or cracked cylinder head. The gases (under pressure) force coolant out of the reservoir. This also causes a void in the upper part of the cooling system , leaving no coolant at the thermostat and the coolant temperature sending unit. The result is a erroneous temperature Reading and will even prevent the thermostat from opening.

Does a bad thermostat cause coolant to leak out?

It can if it is stuck closed the engine overheats causing hot air ( steam ) to flow backwards to radiator cap which releases and blows steam pressure into recovery reservoir which starts blowing out the coolant in the reservoir making a puddle on ground.

89 Cadillac Seville seems to get really hot towhere the coolant bubbles in the reservoir what could be the problem?

Head gasket? Low coolant level? Water pump not circulating coolant? Thermostat not opening? Radiator plugged or restricted?

92 Camry engine coolant reservoir boils thermostat and radiator caps replaced radiator replaced 8 mos ago?

You need to check coolant temperature sensor and the water pump.

Where is the coolant level sensor on a 2004 Saturn Vue. In the radiator or the reservoir?

at the bottom of the coolant reservoir tank.

What does the P0128 code mean?


Where is the radiator sensor located?

For the coolant level it is usually located in the coolant reservoir. For the coolant temperature it is usually located on the engine close to the thermostat or on a cylinder head. Need more info like year, make and model to help you more.

How much coolant to fill a 1997 Saturn sw1?

The amount of coolant it will take to fill your vehicle is dependent upon how low the coolant level is. You can add coolant to your coolant reservoir. The reservoir will have an indicator of when the coolant system is full.

Can no coolant in reservoir cause engine not to start?

Coolant is used to keep an engine in a vehicle at a temperature safe for operation. If no coolant is in the reservoir, an engine will not start.

Why would the low coolant light come onon a 2000 Sable?

In the engine compartment, on the left side of the engine is the coolant reservoir. In the coolant reservoir, there is a sensor at the bottom of the reservoir. This sensor is supposed to let you know when you are low on coolant, but can also become defective, and give you a "false-positive" reading. The only way to know this is to check your coolant when the low coolant light comes on. If there is a significant decrease in coolant, you may have a problem in the cooling system , but if you don't, chances are the sensor isn't working. If the sensor is the problem, you can unplug it from the coolant reservoir, by unscrewing the two screws holding the reservoir to the car's inside firewall, then tilting the back of the coolant reservoir forward until you see wiring coming from the bottom of the reservoir, which is the plug for the low coolant sensor. Unplug the sensor, and the low coolant light won't come on anymore. However, you will now have to make sure you check your coolant level in the reservoir on a regular basis.

After replacing thermostat and coolant on 1997mitsubshi eclipse GST turbo the vehicle runs hot still and boils over the reservoir What is the problem?

probably its wrong thermostat and it doesnt open. take it out and run car without it

What does it mean when gage inside reads car is hot yet antifreeze is not going down in reservoir or radiator on 1993 Oldsmobile Cutlass Supreme?

It sounds like you may need to replace your thermostat. Even though you have enough coolant in the radiator and overflow reservoir the coolant may not be circulating through the system because the thermostat is not opening. When the coolant can't flow through the engine and radiator it will get very hot and stay very hot. This is usually an inexpensive and fairly easy fix, just purchase a new thermostat and install it or have a mechanic do it for you.

Check coolant level?

To check the coolant level of a vehicle first see look for the overflow reservoir. There should be a coolant dipstick with a level gauge on it. Remove it from the reservoir to see the coolant level.