2000 Impala leaks coolant out hose in firewall

1. If you need to jump start the car the battery is failing and you need to replace it. Other wise you may have an excessive power drain while the car is sitting which is running down the battery sufficiently so it will not run the starter motor.

2. If you have a low coolant warning light then you need to check the coolant level in the radiator when the engine has cooled and top it up using only the correct spec coolant for the car as specified by GM. Coolant level in the radiator needs to be checked very regularly in any event as does engine oil and power steering fluid level. If the coolant is low your engine will overheat and will likely cause very expensive engine damage many times what it will cost to fix the cause of the low coolant. You will have an external leak(such as a leaking radiator or leaking hose or failed radiator cap etc etc ) or an internal coolant leak that is causing the loss of coolant. Whatever the cause, and you need to have it investigated and repaired straight away if the cooling system continues to lose coolant.

check around above where you see coolant, might be a hose is leaking down, hopefully. otherwise it could be head gasket and big money

Obisouvly a leak somewhere.Would start with upper and lower radiator hoses with vehicle running and at normal operating temp.This will allow the cooling system to build pressure,look for signs of wetness at hoses as well as heater core hoses from water pump to usually the firewall where they go into the passenger compartment to the heater core.

i hate to be the bear of bad news but do a head gasket check . most likely your head gasket is leaking a small amount and its getting burned off.

wash the engine with water and let it dry, then pressurize the cooling system with a tester, using a mirror and a trouble light search behind and under the engine all hoses , frost plugs and firewall areas, also around the overflow bottle, of course it could be an internal engine leak either in the crankcase of an intake gasket,

the heater hoses pass through the firewall into the heater core, which resides inside the dashboard. either one of the hoses themselves is leaking, or the heater core.

if the hose has a small hole in it, it is no problem to replace, any parts house can get you a replacement hose, let car cool, loosen clamps remove old hose, install new one

You can bypass the heater core, you just wont have heat anymore. On the firewall of the truck, behind the engine, you will see 2 rubber heater hoses that go into the firewall. They attach to the heater core. Disconnect them and get a plastic connector, and connect the 2 hoses together with clamps to hold them down. This will stop coolant from going into the heater core, and no more leak.

With what was given try to tighten hose if still leaking try replace that hose may be old and cracking

That hose is the drain hose for the air conditioner evaporator. If it is leaking coolant, there's a good chance that your heater core is leaking, as it is in the same 'box' that the air conditioner evaporator is in. You'll need to replace the heater core.