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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Posted on Apr 12, 2017

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SOURCE: 2004 toyota corolla idle jumps

If you dont have any trouble codes, this usually occurs when the idle air control valve (IAC) is going bad.

Posted on Mar 25, 2009

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SOURCE: 2004 toyota sienna a/c not working one side cold other side warm

there are two a/c lines that run down the fire wall under the van to the rear.right around the bottom of the fire wall the is a connection point on both lines. you will find a leak there .replace the orings and recharge system. also you will need two specail toyota tools to release the couplings.i have done this repair on several sienna's. let me know if this helps.

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SOURCE: 1999 Toyota Camry V6 idles rough and stalls after

yes it could be a fuel related problem, when was your last tune up, it could also be a spark issue, old or corroted spark plugs will sometimes not put out the correct amount of heat to ignite the gas correctly till it runs for a while, if the check engine light isnt lit, it will almost have to be something simular to this

Posted on Mar 19, 2010

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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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