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Another Air Conditioning Problem

Traditimeour

By Traditimeour,
in General Maintenance

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Traditimeour Mentor

Traditimeour

Posted
Posted

Does anyone have an idea why my A/C would blow hot air after i give the car a bootfull.

Car is a 33 gtst sedan, works fine when your driving sedately, but if you start doing some harsh acceleration it just blows really hot air. the car has too cool down before it'll go back to being normal A/C again.

Would it be a sensor gone? I've done the system test and verything seems fine by the numbers.

cheers

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BH_SLO32 Proficient

BH_SLO32

Posted
Posted

The ECU controls the operation of the AC compressor. The ECU will turn the compressor off when accelerating hard to remove load from the engine when you really need it.

Cheers

Does anyone have an idea why my A/C would blow hot air after i give the car a bootfull.

Car is a 33 gtst sedan, works fine when your driving sedately, but if you start doing some harsh acceleration it just blows really hot air. the car has too cool down before it'll go back to being normal A/C again.

Would it be a sensor gone? I've done the system test and verything seems fine by the numbers.

cheers

Traditimeour Mentor

Traditimeour

Posted
  • Author
Posted

But after I've calmed down from my lead foot, I have to wait till car cools down and I have to hold the off button down (reset?) before it starts to work again. Usually the next morning.

It also blows the hotness if i've switched off the A/C

BH_SLO32 Proficient

BH_SLO32

Posted
Posted
But after I've calmed down from my lead foot, I have to wait till car cools down and I have to hold the off button down (reset?) before it starts to work again. Usually the next morning.

It also blows the hotness if i've switched off the A/C

It sounds like the ECU is not switching the compressor on after hard acceleration. To check you will need to monitor the voltage at pin 9 (AC cut signal) before and after you load the motor. With the AC off you should have approx battery voltage at pin 9. When the AC button is pressed the voltage should drop to 0-1V.

Likewise pin 46 (AC switch signal) should have approx battery voltage when the AC is off and approx 0 volts when the AC is pressed.

Hope this helps.

Cheers

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