Herater Question, And Tire Question On 2003 Civic

Hello:
Re a 2003 Civic:
Two questions please.
a. Heater acting funny.
If the car is parked, and the heater turned on, it will blow substantial amounts of hot air at the different fan settings.
Works just great.
However, after a few miles, no more hot air.
Any thoughts on ?
As a point of possible interest with this, the A/C also acts "flaky". Usually it eworks for a little while, maybe, then nothing.
b. Anyone know anything about Republic Invader Sport tires out of China ?
Are they considered "all-weather" ?
Quality ?
Thanks, B.
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