If you lost heat, either you are low on coolant or there is an air pocket. However, if the heat was working, there shouldn't be air in the system.
Here are the directions for refilling the system. Take a look at them and let me know if this is how you did it.
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Pic 1
10. Pour Honda All Season Antifreeze/Coolant Type 2 into the radiator up to the base of the filler neck.
NOTE:
- Always use Honda All Season Antifreeze/Coolant Type 2. Using a non-Honda coolant can result in corrosion, causing the cooling system to malfunction or fail.
- Honda All Season Antifreeze/Coolant Type 2 is a mixture of 50% antifreeze and 50% water. Premixing is not required.
Engine Coolant Refill Capacity (including the reservoir capacity of 0.4 L (0.4 US qt):
M/T: 4.0 L (4.2 US qt.)
A/T, CVT: 3.9 L (4.1 US qt.)
11. Install the radiator cap loosely.
12. Install the battery.
13. Start the engine and let it run until it warms up (the radiator fan comes on at least twice).
14. Turn off the engine. Check the level in the radiator, and add Honda All Season Antifreeze/Coolant Type 2 if needed.
15. Put the radiator cap on tightly, then run the engine again and check for leaks.
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Note, if you feel confident that you had all the air out, there could be a head gasket issue allowing compressed air to enter the cooling system Take a look through this link:
https://www.2carpros.com/articles/head-gasket-blown-test
Let me know if anything in the aforementioned link seems to mirror what you are experiencing.
Take care,
Joe
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Sunday, November 8th, 2020 AT 4:03 PM