Question about 2009 Toyota Matrix

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A/c blows warm air when car is on motion, but works well on idle

Hello, I drive a 2009 toyota matrix S 2.4ltr @ about 2 months ago, i got the whole a/c system replaced. ie compressor, condenser, expansion valve..etc. This was because the old compressor knocked, why or how it happened i don't know. But the problem now is that the a/c works well when idling and it cuts on and off when driving (like 10-30 seconds interval) to the extent that i would start to feel warm air for a while and suddenly it will start to blow cold again. Its really frustrating! Taken it back to the workshop countless times, but they just can't seem to see what the problem is. Please help!

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  • Toyota Master
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In normal circumstances the heater wouldn't begin blowing warm air until the vehicle has travelled 5 miles - call it 5 minutes. That's because the thermostat only begins to open at around that mileage/time and allows coolant to circulate around the engine. Before that - there just isn't any warm coolant in the heater matrix.

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