A/C problem gets warm air after long high-speed drives?

2000 MAZDA B3000

3.0L • AUTOMATIC

DIEGO GONZALEZ

MEMBER
2 POSTS

I get warm air after long high-speed drives.
I only get air through defrost vents when accelerating fast.

Attached is a picture of the pressure gauges at a ambient temperature of 95 degrees

Image (Click to enlarge)

Sep 7, 2026 at 1:07 PM

STRAILER

✓Experienced Mechanic
55,412 POSTS

So, the AC temp issue and the vent issue are separate problem, please start a new thread for the vent issue, we will handle the AC issue on this thread. Can I ask if you hear the radiator fan clutch kick in while driving (hot), if not this will be the issue with the AC, the pressures look okay on your gauges. Also, I would use a garden hose and blow out the cooling fins on the condenser and radiator. This video can help as well

https://www.youtube.com/watch?v=4UjfQKvrB6Y

please go over this guide too.

https://2carpros.com/articles/fan-clutch-symptoms/

Let me know :)

Sep 8, 2026 at 9:38 AM

DIEGO GONZALEZ

MEMBER
2 POSTS

Hello, I have checked out the fan and it does appear to be working. No signs of overheating or any weird noise are coming from the fan. The fan can also spin when the engine is off with some resistance.

Sep 11, 2026 at 10:10 AM

STRAILER

✓Experienced Mechanic
55,412 POSTS

You may have an evaporator that is icing up, after the AC stops working and you park the car, does it leave a large water puddle under the car? Please go over this guide.

https://2carpros.com/articles/why-your-cars-ac-evaporator-ices-up-and-how-to-fix-it/

Sep 12, 2026 at 8:58 AM

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