Hi,
The idea that you lose heat indicates there is no coolant flowing, or at least not enough. Since the problem was gone for a couple weeks, are you certain that the coolant level is still low? That will cause it. When the engine is cold, open the radiator as well and check the level.
If it is low, first check for leaks. Here is a link you may find helpful:
https://www.2carpros.com/articles/coolant-leak-symptoms
If you find the coolant is full, take a look through this link. We could have a head gasket related issue.
https://www.2carpros.com/articles/head-gasket-blown-test
Let me know what you find or if you have other questions.
Take care and God Bless.
Joe
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Saturday, February 27th, 2021 AT 8:08 PM