My A/C doesn't work all the time and the heat will turn on by itself and makes a clicking noise. And blower only works on high

Asked by Jan 14, 2015 at 08:23 AM about the 2002 Chevrolet Silverado 1500 Ext Cab Short Bed 2WD

Question type: Maintenance & Repair

1 Answer

8,520

I've had an epidemic of heat/cool problems on GM's from 2000 up to about 2006 and most are due to the air mixer vents. These vents are vacuum controlled through a rotary switch that selects upper,lower, ac,def. ...etc I'm finding the O ring seals are leaking and causing hot air when you want ac or visa -verse . Try rotating the switch to see if it resolves the problem ... if it does ... it needs to be replaced because rotating the switch is only temporary ... the problem will return

Your Answer

Add photo

Related Questions

  • Why does my heat only work at the "90 degree" setting? 2 answers

    Any setting below 90 degrees and the heat will turn to cold air. Blower motor works across all settings (low to high) and the air conditioning seems to be working fine. I recently flushed my coolant...

    2007 Chevrolet Silverado 1500 LT1 Ext. Cab SB 4WD

    -

    Maintenance & Repair

  • Understanding Voltmeter Reading 2 answers

    On a given day the voltmeter may read 13v, 15v and 14v regardless of how many electrical accessories may be turned on and regardless of the number of hours since starting the vehicle (when the voltm...

    2012 Chevrolet Silverado 1500 Work Truck 4WD

    -

    Maintenance & Repair

  • Loud knocking noise 5.3 55 answers

    I have a loud knocking noise coming from the engine . At first I thought it was comin from the top but when i get under it it's alot louder sounds like its comin from the oil pan. I had the transmissi...

    2005 Chevrolet Silverado 1500 Z71 Crew Cab 4WD

    -

    Maintenance & Repair

  • high rpms but won't pick up speed 5 answers

    When accelerating quickly my rpms go up but I gain no speed. Going uphill I loose speed to where I'm going 40 mph even with the gas floored

    2008 Chevrolet Silverado 1500 Work Truck Extended Cab

    -

    Maintenance & Repair

  • 2000 Cavalier (2.2L) Turn signals out, rear and front and blower only works on high...other weird things going on 1 answer

    13 months ago I installed an after market stereo...the horn wouldn't stop honking (even dealer couldn't fix the issue so they pulled the fuse). Last month my right front turn signal quit but the swi...

    2000 Chevrolet Cavalier LS

    -

    Maintenance & Repair

Search Chevrolet Silverado 1500 Questions

Chevrolet Silverado 1500 Experts

#1 John Carson
John Carson
Reputation 2,110
#2 Rowefast
Rowefast
Reputation 1,790
#3 Silverado_owner_2006
Silverado_owner_2006
Reputation 1,610
View All

Related Models For Sale

Used GMC Sierra 1500
855 Great Deals out of 66,786 listings starting at $1,995
Used Ford F-150
2,316 Great Deals out of 210,527 listings starting at $1,499
Used Dodge Ram 1500
443 Great Deals out of 11,343 listings starting at $1,000
Used Chevrolet Silverado 2500HD
322 Great Deals out of 27,097 listings starting at $1,250
Used Toyota Tundra
517 Great Deals out of 33,554 listings starting at $3,400
Used Toyota Tacoma
507 Great Deals out of 39,601 listings starting at $2,900
Used Chevrolet Tahoe
568 Great Deals out of 27,717 listings starting at $1,999
Used Chevrolet Camaro
164 Great Deals out of 33,234 listings starting at $1,995
Used Ford F-250 Super Duty
353 Great Deals out of 47,749 listings starting at $1,795
Used Chevrolet Silverado 2500
8 Great Deals out of 282 listings starting at $3,000
Used Ford Mustang
374 Great Deals out of 47,165 listings starting at $1,999
Used Chevrolet Silverado 1500HD
12 Great Deals out of 269 listings starting at $3,950

Used Cars For Sale

2017 Chevrolet Silverado 1500 For Sale
51 Great Deals out of 114,136 listings starting at $20,499
2016 Chevrolet Silverado 1500 For Sale
142 Great Deals out of 6,123 listings starting at $18,190
2015 Chevrolet Silverado 1500 For Sale
177 Great Deals out of 7,418 listings starting at $15,888
2014 Chevrolet Silverado 1500 For Sale
285 Great Deals out of 10,499 listings starting at $9,988
2013 Chevrolet Silverado 1500 For Sale
171 Great Deals out of 5,191 listings starting at $6,900