Squeal on first startup

[Techn0Nut1996]

On cold days when I first start the car and have the defrost going it squeals unbelievably loud (I thought I hit a pig at first) and lasts for about 15 -30 seconds. Once the squealing stops there is a rather large increase in power, which is the part that confuses me. I thought it was just the A/C going bad but I'm not sure if that would cause a power difference?

[4g63lover]

Maybe the ac clutch is starting to seize up.

[oakrdrs187]

A/C should be off on heat. You may have moisture in the belt or needs tightening.

But as already mentioned, a/c clutch may be going.

[Techn0Nut1996]

Belts are tight and were replaced a couple years ago. Is the A/C clutch an expensive fix?

[oakrdrs187]

were replaced a couple years ago.

This.

[CHICAGO_ONE]

Just had this. Belts were done a few years ago and look to be in good condition, however the AC belt was loose and was slightly off. Realigned, re tightened, no issue

[Techn0Nut1996]

Alright cool I'll look into it.

[tamim13]

A/C should be off on heat. You may have moisture in the belt or needs tightening.

But as already mentioned, a/c clutch may be going.

If the defroster is on, even if the heat is on, isn't the AC compressor working at that point?

[Techn0Nut1996]

If the defroster is on, even if the heat is on, isn't the AC compressor working at that point?

That's what I thought, I still don't understand why it causes a power drop tho.

[4g63lover]

The compressor is on during defrost. If it is in fact seized it would cause the engine to load up because the pulley is not freely spinning causing the power drip

[Techn0Nut1996]

^^But if its seized wouldn't it not work at all?

[oakrdrs187]

If the defroster is on, even if the heat is on, isn't the AC compressor working at that point?

Ahh I forgot about that. And your right.