1999 Chevy Astro AC Blower High Shuts Off

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LARRYBB
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i have a 1999 chevy astro van, 175,000 miles. my a/c did blow fairly well on low and med. but will shut off if placed on high. we replaced the blower motor,the fan speed control knob and the blower resister without sucess. it did with each new item replaced blow on high for a few minutes, and then it would shut off again. it still blows very little air on low and medium.any suggestions [/b]
Apr 19, 2006 at 2:51 PM
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LOSONE
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  • 1,616 POSTS
Behind the A/C dash assembly there is a brown wire that leads to the blower resister. It has a black connector that will often get hot and burn so you will loose voltage. Check it out and let me know.
Apr 20, 2006 at 2:08 AM
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LARRYBB
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in regards to the a/c wire in the dash we checked it to find no burnt wires but the high works when it wants to but doesnt blow out air very well as on all other settings also any more suggestions
Apr 25, 2006 at 9:59 AM
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LARRYBB
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also the blower motor resister has a plug wire that fits in it .it has about 6 to 8 diffrent wires going into a plug on it (under the hood) that goes into the resistor, one of those on the plug part has been burnt could that be the problem should we replace that plug in ?
Apr 25, 2006 at 10:04 AM
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LOSONE
  • ✓Experienced Mechanic
  • 1,616 POSTS
By all means repaece the plug. Get one from a salvage yard and splice it in.
Apr 30, 2006 at 6:49 AM
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Suggested Repair

Replace the burnt blower resistor plug, preferably with a salvage-yard connector spliced in. Also inspect the brown wire and black connector behind the A/C dash assembly for heat damage that can cause voltage loss.

Conversation Summary

A 1999 Chevy Astro van's blower worked on low and medium but shut off on high. Replacing the blower motor, speed-control knob, and resistor did not fix it; high would work briefly, then stop, and airflow remained weak. The resistor plug had a burnt wire. The expert advised checking the brown wire and black connector behind the dash for heat damage, then replacing the burnt plug and splicing in a salvage-yard connector.

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