Question about 2003 Pontiac Montana

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Change thermostat on gm 3400 v6

Only 38,000 miles

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  • jayeeegee Jan 24, 2009

    Thanks Steven. The dealer wants $500 for this and I thought it may be more reasonable that the GM instructions that required removal of the crossover manifold. Another comment adding to yours said "...with the right tools and small hands..." So I think I'll try it. John



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Drain coolant at the radiator drain. Remove air intake hose and MAF sensor assembly. remove throttle cable bracket and disconnect cable linkage. Remove throttle body bolts and disconnect coolant hoses to throttle body. Loosen heater hose pipe and remove heater hose from rear of pipe. Remove radiator hose from thermostat housing. Remove top thermostat housing bolt. Loosen and almost remove lower thermostat bolt. You will need to slide your wrench and hand under the exhaust crossover pipe to gain access. Loosen the bolt until you can remove the thermostat housing, it should be slotted to clear the bolt. Replace the thermostat and reassemble. Bleed cooling system using the two bleed screws (one on thermostat housing and the other on the passenger side of the engine where the heater hose pipe comes out above the water pump.

Posted on Jan 24, 2009


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