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I don't understand no cars have heat when first started. Lets try this engine cold take cap off radiator put in a thermometer like a meat thermometer it will read the temp of the water the antifreeze should be right to the top. Start the car and let it run when the upper radiator hose gets hot all of a sudden that is when your thermostat is starting to open it will read 180 to 195 on the thermometer it will fully open at 200 to 215 and the electric fan should be off till it is above 200. If the radiator hose feels like water is going through it right after it is started and the engine slowly warms up to about 100 to 120 and won't go above you have a bad thermostat replace it. If this helps please rate it thanks. If you have any questions just ask I will be watching the post
most likely you have a blend air door cable that has either been broken, disconnected or stripped out. there are blend doors that control the direction of air flow, and another one that controls temprature. look fr a cable coming from the back of the unit, or if it is a electric then you will have to trace wires. the temp door should be in the rea behind thee glove box.
> internal thermometer Do you mean coolant/engine temperature or ambient air temp?If you mean the engine's operating temperature, then the temperature sensor is failing.This won't bother operation but you will also have no monitoring of operating temp in case something is awry with the engine. Such sensors are fairly common failures and not terribly expensive to replace.
If the light goes out after engine gets alittle warm, this is normal. Since there is no temp guage, VW uses this light to inform that the engine is cold. When that same light flashes red, it means that the coolant is low or the engine is overheating.
that is not your thermostat, that has to be the temp sensor on your cylinder head, should be next to the intake manifold on the head. it has 1 cable. that sensor´s only job is to show you the temp of the engine on the temp dial in your instrument display the thermostat is connected to a water hose that goes to your radiator, its also on the cyinder head, but thermostats are only mechanical doors regulated by temperature that allow hot water from the engine go cool down on the radiator. let me know