I would like to change the spark plugs on my 1991 Lexus ES 250 ( I think they are still the original set). How involve it is to get to those three in the back? Do I have to remove the intake manifold and replacing the gasket afterward? Any other tips? Any tip would be helpful.
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Hi, Most of the time you can follow the UPPER radiator hose to the engine and there will be the thermostat housing. On Reverse Flow cooling systems you follow the LOWER radiator hose. All the thermostat does is trap coolant in the engine until it reaches a certain temperature, then opens to the radiator to be cooled. Don't forget to bleed the air from the highest place in the cooling system. Sometimes that's the reservoir, but look for a small plug high on engine. Good luck
Probably under the intake manifold. Intake manifold will need to come off. This is quite common these days & if not sure how to do it have a mechanic do it. Look under intake & see if you can see the plug wires.