Q: Radiator Flush vs Drain and Refill, which is better when trying to get car to blow cooler air?

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My car is not blowing cool air when A/C is on. I changed AC relay, AC fuse, air filter, and cabin air filter.

Looking at a recent receipt (6/22/17) says I got a radiator flush/fill. What's the difference between that as compared to Drain and Refill. Which one is best when improving cooler air in cars.

Im just trying to do a little trouble shooting. It very well could be mechanical, but hoping it would not. What other things you suggest that I can try and in your experience if it is mechanical, on average what would it cost me?

My car has 158000 miles.
My car has an automatic transmission.

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