Low Coolant light comes on

2002 Chevrolet Suburban
low coolant light keeps coming on add water light goes out , been doing this for a while !!!
so today I went out to the truck pop the hood added water to a cold coolant tank , then looked under the vehicle and notice water coming out from what looks like the area under the coolant tank !!! could it be the tank or a hose ??? I never started the vehicle , once it quit leaking started the vehicle drove it a few miles and the low coolant light came back on the temp stayed normal ???

Possibly a sensor in the bottom of the tank leaking

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Originally Posted by DockShootinJack

Possibly a sensor in the bottom of the tank leaking

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so what would I do in that case ?? is the sensor replaceable ???

Sensor is part of the tank.

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I have seen those tanks crack also

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Quote:

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Originally Posted by Hogster1

Sensor is part of the tank.

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so that means replace the tank and be done with it !!!

Yes sir if that's what's leaking.

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Quote:

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Originally Posted by Hogster1

Yes sir if that's what's leaking.

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thanks !!!

Either the tank itself, or there is a Y-hose that runs from the water pump, and splits off the the heater core and coolant reservoir. The Y fitting is plastic, as are the clamps. They degrade or split and cause leaks. The whole replacement hose assembly is about 50$.

https://www.ebay.com/p/HVAC-Heater-H...YaAk2gEALw_wcB

You should also replace the plastic heater hose connectors on the firewall while the system is empty. They are known to fail after several years of use.

Look for the drain cock. It might be loose.

Here is what they look like in case you are not familiar with them. Advance Auto Parts - Down for Maintenance

Quote:

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Originally Posted by Barnacle Bill

Look for the drain cock. It might be loose.

Here is what they look like in case you are not familiar with them. Advance Auto Parts - Down for Maintenance

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That's on the bottom of the radiator, not the reservoir.

turned out to be the water pump was bad !!!

Glad you found it and got it replaced.

May want to check water pump it has a small weep hole at the bottom.

Glad you got it figured out