We now have a kit that will replace your high lowrelays. This replaces all of the fan relays on the driver side inner fender. If your fan controls are not constantand seem to be intermittent this kit may be your solution. The 2 smaller relays are identical. The are used in the operation of your highand low speed fan circuits.
Low Speed Relay: Controlled by ECM at 208and high pressure A/C switch when it reaches 150 PSI.
High Speed Relay: Controlled by ECM at 226and high pressure A/C switch when it reaches 275 PSI.
The high low relays replace GM part # 25526984 x2
For a complete set with fan delay relay, look here: http://www.gbodyparts.com/product_info.php?products_id=1881&osCsid=af66fb88e552e9f79e413fbcd58b0bb5