Possible heater core poss. thermostat ck. both heater hoses at fire wall 1 hot 1 cold its the core ck pass side floor wet its the core Maybe head gasket
SOURCE: My 2001 chevy venture van
Make sure you have gotten all the air out of the system by running the car with the cap off for a bit.. also make sure the radiator overflow if at proper level.. next look at your radiator and see if it is plugged up with trash bugs what ever this will slow your cooling big time.. also look between your radiator and your air condition condensor and make sure its clean also there can be trash in there causing it to heat .. also check belts make sure they are tight.. really sounds like you started with air in system and system might be air locked needing to run a bit with cap off when cool. dont take cap off when hot ... make sure over flow is full also... thanks and holler if you need more. Jerry
SOURCE: Why am I losing coolant and have no heat or air?
I would start by checking for coolant leaks. Common places would be in the waterpump or heater core. Heater cores can crack and leak. The heat from your vents inside the vehicle comes from air passing over the heater core, which is heated by the hot coolant flowing through the heater core. It acts in a similar fashion to your radiator, with the purpose of heat transfer. A coolant system that is low on coolant will not transfer heat through the heater core. Also, deposits from the coolant system can collect and plug the heater core which will restrict the flow and the amount of heat that is transfered to your heater. If you don't see coolant leaking externally, it may be leaking into the engine. this may be from a blown head gasket or warped head. If this is the case you may notice some whitish color smoke coming from the exhaust, as well as your coolant overflow/storage tank fluid level may increase.
The air conditioning is a seperate system and may be a seperate issue. The system contains liquid freon like a refrigerator. You can by recharge kits at your local autoparts store. If the kit works, you may find there is a leak in the system and you will loose cold air after some time. If thats the case, a certified dealer can fill the system with colored dye to help locate the leak. A bad compressor or evaporater can also cause a/c systems to fail.
SOURCE: 2002 Chevy Impala low coolant light is on
I had this same problem with my 2002 3.4L engine impala. Unfortunately, there was a coolant leak at the lower-intake manifold, caused by a cracked gasket. I replaced the gasket, water pump, thermostat, spark plugs and wires and flushed out the heater coil. Didn't find out what it was until after spending 100s on Dex-Cool. I kept refilling it for months until I got a good mechanic to fix the problem whom told me that this is a common repair on older impalas and GM vehicles with 3.4 and 3.1 engines.
SOURCE: 2004 Chevy Impala no heat from defrost or heater
No heat is often a symptom of low coolant, usually followed by overheat. There are other controls that regulate heater, but right now, re-fill the cooling system with engine running and heater on high, then check for leaks (coolant you lost went somewhere...you need to determine where) Low coolant will damage your engine. Take care of that first, then if heater still does not work, then do diagnosis on that. (if you loose the engine heat won't matter, will it!)
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