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A 2003 Jeep Liberty uses red, hoat, five year coolant.
Most likely.
Take the cap off the radiator and open the petcock on the bottom of the radiator.
The radiator drain plug should be located on the bottom of the radiator on the passenger side. Open that, let the old coolant flow into a drain pan, replace the drain plug once the coolant is out and the radiator is flushed, then fill it up through the radiator cap.
It doesn't have a drain plug. You either have to pull out of the fill hole with a vaccuum devise , or take the cover of to drain.
what is this code p1491 on 2003 jeep liberty
No. A 2003 Jeep does not have a cabin filter.
Yes , the V6 in a 2003 Jeep Liberty is a 3.7 liter
Even without a cap, you still have a drain plug at the bottom of the radiator, it will unscrew, and release all your water, then you have a separate resovoir for coolant that you fill it back up with, it will say coolant on it.
Low of coolant or overheating.
The heater uses the engine coolant to heat the vehicle. The radiator has a drain petcock along the bottom edge to drain the coolant system.
coolant you retard not water!!