General Motors Tech Chevy tech talk within.

1998 chevy k2500 a/c problems

  #1  
Old 07-12-2011, 08:18 PM
Junior Member
Thread Starter
Join Date: Jul 2011
Posts: 1
Default 1998 chevy k2500 a/c problems

hi everyone thanks in advance for your help.i wil start from beginning,this winter i noticed that my heat was coming out the defrost and floor only no matter what position i put the dial and it also would only work on the highest setting and at that it was finiky and sometimes not come on at all.well summer arrives and im a landscaper and want to use my ac and at first i get nothing except when the high speed setting decides to activate mysteriously but never would it start the compressor,so i replaced the relay with new gm relay and i get nothing and then i change both fuses that were good to begin with and still nothing.i then replaced the resistor and control switch to no avail nothing except the mysterios high speed come on here and there but never does it activate the compressor.so i pull the ac relay and jump a wire from side to side pins (closest to exhaust of under hood fuse box) and low and behold the compressor engages and blows ice cold air out the defrost and floor.so then when gooogling i came across a gentelman who said jump the low pressure switch and high pressure switch to see if they are bad,but that didnt work without also jumping the a/c relay at the same time.i put a test light on the wire going to the lower pressure and high pressure switches and i have nothing even with relay jumped...also with clutch engaged pumping out cold air to the cab i checked the pressure and my generic gauuges say i was good.im thinking after what i have read that it could be the a/c heat control panel having a bad circut.any help would be great
 
Related Topics
Thread
Thread Starter
Forum
Replies
Last Post
dfshimmin
Chevy Silverado/ GMC Sierra Forum
2
02-12-2011 08:38 PM
86runner
Chevy Silverado/ GMC Sierra Forum
6
01-25-2009 08:31 PM
86runner
Chevy Silverado/ GMC Sierra Forum
5
01-24-2009 12:19 AM
drobertson
General Motors Tech
1
09-20-2007 06:54 AM
slaveToHorses
Automotive Parts for sale
0
10-27-2006 03:20 AM


Thread Tools
Search this Thread
Quick Reply: 1998 chevy k2500 a/c problems


Featured Sponsors
Vendor Directory

Contact Us - Archive - Advertising - Cookie Policy - Privacy Statement - Terms of Service

© 2019 MH Sub I, LLC dba Internet Brands

We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.