When your 1994 GMC Sierra begins to overheat and you have confirmed that the truck is not low on coolant, the thermostat may be failing. You can replace the thermostat at home without having to spend hours in a service center waiting area. Buy a replacement thermostat from an auto-parts retailer or GMC dealership. Get your truck back on the road in no time and gain a sense of accomplishment by doing it yourself.
Instructions
- 1
Raise the hood of your GMC Sierra pickup. Remove the radiator cap. Position a large drain pan beneath the radiator drain plug on the passenger side of the radiator.
2Loosen the radiator drain plug with a wrench. Wait while the coolant drains until it is just below the level of the upper radiator hose. Tighten the radiator drain plug. Remove the drain pan from under the truck.
3Follow the upper radiator hose to the opposite end, beside the intake manifold on top of the engine. Loosen the hose clamp with a flat-head screwdriver. Pull the hose off the thermostat housing. Remove the two bolts securing the housing to the mounting area with a socket and ratchet.
4Pull the thermostat housing apart. Remove the old thermostat from the housing. Clean any remnants of the old gasket from the housing and the mounting surface with a flat scraper or similar tool. Insert the new thermostat in the housing and position the new gasket on the mounting surface.
5Place the thermostat housing on the mounting surface. Replace the retaining bolts and tighten them evenly. Do not over-tighten the bolts, to avoid crushing the gasket. Replace the radiator hose and tighten the hose clamp with a flat-bladed screwdriver.
6Add coolant to the radiator until the coolant level is full. Replace the radiator cap and close the hood of your truck.
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