Re: A/C cycles when heat is on
Too bad manufacturers just figured that out in the 1990s. If they realized that by automatically engaging the air conditioning when the defrost is on, they could have saved many compressors & other various air conditioning parts.
By the way, not only does it do well for the A/C system in winter to cycle on, it really does decrease the amount of time it takes to defrost a windshield, and sometimes other windows if they are fogged too. Reason is simple - the A/C system is acting a bit like a dehumidifier as the evaporator removes the humidity from the air.
As a final note, many manufacturers recommend you run the A/C system in the winter months at least consecutive minutes a week. I use to do this in a prior vehicle that had A/C and I never had any problems - even when the car was 11 years old.