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Where is the thermostat located and how do you replace it located on a 1991 Chevy Lumina 3.1L?
Wiki User
∙ 18y ago
The stat is located within the water outlet which is attached to the bottom of the top radiator hose.To change it: Gain access to it by removing any component in the way. I don't drain the system ,I simply remove the bolts holding the water outlet and it will drain from the manifold into a pan that you place under it.Remove the old gasket and clean the mating surfaces. Pay attention to the way the stat is pointing, then remove it. Place new stat the same way old one was removed, along with a new gasket. I always use a silicone sealer if a paper gasket is involved.Tightnen the bolts EVENLY so as not to crack the water outlet housing. Fill with coolant, and leave the rad cap off for 20 minutes with car running and add coolant to top the system off and bleed the air out. DONE. I hope this helps you. Mark
Wiki User
∙ 18y ago
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