AC cuts out when accelerating

C2ndLTpigeon · Jul 24, 2017

Wanted to see if anyone might know why my AC cuts out when i accelerate usually above 2000 RPM, then when i let of the gas when im up to speed the AC kicks in. Is this normal? Or a problem.

My truck is a 1999 Ram 1500 Magnum 5.2 Auto trans if that helps
Thanks

crash68 · Jul 24, 2017

problem.. if it stops blowing out the vent on the dash when you accelerate but the fan keeps running, it maybe a vacuum leak.

C2ndLTpigeon · Jul 24, 2017

My dad had mentioned it might be that. Anywhere i should start looking on particular?

dudeman2009 · Jul 24, 2017

Start under the hood around the passenger side of the intake, there are small plastic and rubber lines that control accessory functions like vent selection/cruise/4x4 actuation.

himwest · Jul 25, 2017

There are two check valves in the vacuum line on passenger side of the intake, one of them might be bad. Here is the dorman part number 47170.

WilliamS · Jul 27, 2017

So am I reading this properly, it stops blowing, or does it stop blowing cold?

If it stop blowing, then the posters above me are dead on, its a VAC leak and the vents are going to home position which is usually defrost.

If it just warms up, then the circuit for the compressor is somehow getting activated to early as with most vehicle it will shut off the A/C compressor at higher rpms for performance gain.

dudeman2009 · Jul 27, 2017

WilliamS said:
So am I reading this properly, it stops blowing, or does it stop blowing cold?

If it stop blowing, then the posters above me are dead on, its a VAC leak and the vents are going to home position which is usually defrost.

If it just warms up, then the circuit for the compressor is somehow getting activated to early as with most vehicle it will shut off the A/C compressor at higher rpms for performance gain.

That could point to a compressor issue, but modem compressors on our trucks are internally regulated swash plate type compressors. They should adjust and stay engaged even at 5krpm.

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WilliamS · Jul 27, 2017

dudeman2009 said:
That could point to a compressor issue, but modem compressors on our trucks are internally regulated swash plate type compressors. They should adjust and stay engaged even at 5krpm.

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All the way back on a 99! I learn something new everyday.

dudeman2009 · Jul 27, 2017

WilliamS said:
All the way back on a 99! I learn something new everyday.

If it's aftermarket it might be fixed displacement, but OEM and all current replacement are variable displacement.

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AC cuts out when accelerating

C2ndLTpigeon

Junior Member

crash68

ACME product engineer

C2ndLTpigeon

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dudeman2009

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himwest

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WilliamS

Senior Member

dudeman2009

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WilliamS

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dudeman2009

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