Hi,
No heat can be caused by a few things. The first thing I would suggest is to determine if both heater core hoses are getting hot when the engine is warm and the heater is on high. If they aren't, then suspect the heater core is plugged. So, check that first.
If they are getting hot, then suspect the blend air door in the vehicle isn't working properly.
Here is what I suggest. First, take a look through this link and let me know if anything helps.
https://www.2carpros.com/articles/car-heater-not-working
If it doesn't, with the engine warm and the heater on, see if both heater core hoses get hot. Let me know the results.
If both get hot, then we need to check the blend air door. I attached a pic below showing the location. remove it and see if it moves when you change from cool to heat.
Let me know what you find or if you have other questions
Take care,
Joe
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Tuesday, December 8th, 2020 AT 1:34 PM