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Does a 1990 Chevy Silverado 1500 have a relay switch to the heater blower fan?
Wiki User
∙ 15y ago
I know the 1989 silverado has a relay and I'm sure it's the same for 1990. The relay is located behind the glove box. There are three relays attached to a bracket. My relay was the one on right as you face them. You can confirm this is the correct relay by turning the ignition on and then push the heater button on and off and you will hear the relay clicking (if power is getting to it). If the relay occasionally sticks, the blower will stay on, even when the ignition is off and it will drain your battery until it's dead. A new relay is $15 to $20.....Also, to unplug the relay (first disconnect the ground wire from your battery) you have to remove a white plastic retaining clip that slides in on the side of the plug. You have to push down slightly on the clip where the wires enter the plug and then carefully pry the clip out from the side. Sometimes the plug is hard to remove from the relay, try a little WD-40 to help it slide off. You might have to use a screwdriver to carefully pry it off of the relay.... Hope this helps. Good Luck, Jeff
Wiki User
∙ 15y ago
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