Why does my engine lose power when I turn on any of my heat climate controls? on 1998 Chevrolet Express 2500

It seems to make the motor click and then lose power.

by in Pittsburgh, PA on October 17, 2013
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2 answers 4 comments
ANSWER by , October 18, 2013
agree with prof.
ANSWER by , October 17, 2013
What do you turn on when this happens? Defroster?
COMMENT by , October 17, 2013
Yes defrost ...heater..vent...fan on low or high
COMMENT by , October 17, 2013
Does your A/C work. Is compressor good.
COMMENT by , October 17, 2013
No..not that great...
COMMENT by , October 17, 2013
Was thinking compressor might be locked up. When the defroster is turned on the compressor also comes on. If your controls are bad during the other settings the compressor might be triggered as well. Should be no other reason for you to lose engine power with heater function. Sorry if I didn't help. If I was close I would check it for you. Need to have someone check it.