No heat replaced thermostat and there is still low heat blowing.

If you know for sure the thermostat is working, it could be low on coolant and has air pockets in the system. Only one radiator hose should be warm until the engine reaches normal temp, and both heater hoses should be very warm.

Check the coolant level. If its low you wont get any heat. If its full then I would suspect that the temp. selector on the climate control is faulty. Farley easy to replace. Your local you pull parts yard will have one for $20-$35.

thermostat is sticking open

you may be low on coolant, if not a common tell tale sign of a faulty thermostat is the car staying on the cold indictaor for a very long period of time especially after acceleration., some other issues may be a clogged heater core, however the most likely culprit is low anti freeze or a malfunctioning thermostat.

Potential causes: Low coolant- fix by adding coolant Thermostat stuck closed- would also cause engine to overheat Thermostat stuck open- would eventually blow at least luke warm air Heater core plugged- Get it backflushed or replace it These are the most common causes

sounds to be a faulty thermostat did your car over heat my vehicle does the same thing its the thermostat when its cold out your vehicle loses all its engine temperature and blows cold air make sure you use 50/50 antifreeze

sounds like the thermostat is stuck open and needs replacing

it may be time to put a new thermostat in to get the temp up where it should be,when you get one make sure it is the 190 degree thermostat

Had the same issue .. turns out that the thermostat was stuck open .. replaced it, and all is fine now

replace you thermostat.