Question about 2004 Ford F150

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Engine seems to lack power w/ ac on . now engine will stall

Engine will stall while driving w/ ac on but will restart . seems to be ok w/ ac off . i have had injectors cleaned but within 20 min engine stalled again.

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  • rdnckn2 Jun 19, 2009

    the ac is not making noise , how ever the rpm is a little low and does drop when ac is turned on those parts you talked about how can i test them

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Check the RPM if it drops when you have the AC on while the car is not moving. If it does drop you may want to check on the idle compensator. Its job is to bring increase RPM to make up for the added load. You may also want to check on the idle if it is below the normal speed. The added load may decrease the speed and send you to stall. If they all check out OK, you may want to check out the compressor as well if it gives the engine too much load. This can be caused by a faulty compressor or too much freon, or the bearing may be bad (with the bearing, you will get to hear a screeching or whinning sound).

Posted on Jun 16, 2009

  • Nicolo Carlo Parazo Jun 19, 2009

    You should know that the AC is on when the 2nd fan on your radiator turns on once you turned on the AC. You should hear a click sound in the engine bay. That means that the electronic clutch has engaged and the belt is driving the AC compressor. Your RPM may be to low tor drive your AC that could probably be one reason why you are not getting any activity. I suggest to have your idle adjusted. If it is erratic normally this may be caused by vacuum leaks or cleaning of the PCV and fast idle control valve would do the trick.




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