300sd slow off the line with ac on!
 

Hi. my 81sd is slow off the line when the ac is turned on.
When in traffic, when light turns green. I turn the air off and it takes off like a rocket.

Is something suppose to turn the compressor off when under a load?

Thanks,


Tom

Nope. That didn't happen to that model until 1985. Some bogging down will happen with the A/C on. But the question is what type of refrigerant is in there? R134a would certainly bog down a motor a lot because of the higher pressure. Or an over charged R12 would also bogging. The other possibility is your compressor is seizing up.


.

The kickdown switch doesn't turn the compressor off?

I have had my 81 300SD since 1984 and it has always acted this way. Going up the hill in my driveway, sometimes I just click off the AC - amazing how much more power it has to go up the hill. I think yours is working properly.

Welcome to our world.

The car only had ~120hp/170tq when new... it's 25 years old now. What do you expect?