A/C Fan Motor Intermittent Failure

We have a 98 V70 with about 85K miles. Recently we have had several occasions when we have been driving for about an hour with the A/C on low that it stops cooling. We can feel cool air at the vent but the fan isn't blowing it around. We don't hear the fan stop, but it does start making a roaring sound especially if we turn it up some.

Two weeks ago, the dealer changed the fan motor in response to this problem. But, the problem has continued as if nothing has changed, except that one of the last two times it happened, we smelled a burning odor. We have found that if we turn off the A/C for about 10 minutes, and restart it, that it then runs properly again. The car has gone back to visit the dealer again.

Has anyone run into this problem? What was the solution?

Do you get any flashing lights on the A/C unit? If so get them to check out the resistor pack - it gives the same error code as a failing fan motor.

I have a '96 850 with an identical problem, roaring sound and all. To diagnose the problem, I shut off the compressor and continued to drive. A few minutes later, volumes of cool air emanated from the vents.

Conclusion:

The evaporator was icing up and obstructing the flow of air. Knowing that, the question distills down to what's causing the icing to begin with.

Does anyone have any ideas?

BTW, the dealer tried to rope me into changing the blower motor, as well, on another issue, which was that the fan motor operated on high all the time, even when the ignition was turned off.

Turned out, as someone else pointed out, to be the resistor. The dealer said it was a bad motor. (How could it be a bad motor if it was operating very well on a high setting?)

I straightened it out, but it was a pa> We have a 98 V70 with about 85K miles. Recently we have had several

If the evaporator is icing up, then it's too cold, probably caused by the low pressure switch. If you can measure your low side pressure, it shouldn't get below about 22 psi (with A/C running of course). If it does, then the low pressure switch is not cutting the compressor off as it should. (When the low side pressure gets down to 22 psi the switch should turn the compressor off until the pressure raises to approx. 40 psi.)

This happened on my 2000 S-40. The only advice the dealer had was to close the cabin air intake when the A/C is on.