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What is your question?
My Blazer has 91000 miles and just started overheating. A pressure test was done and the lower intake gasket is leaking 750.00 sounds high plus they want me to spend another 200.00 replacing plugs etc because it will be "cheaper" to do it all at once. A rip off or a fair price? Is there any sealant I can put into the radiator to stop the leak? Thanks

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I don't know what the route cause of the over heating . I am sure some diagnostic work has been done to check cooling fan operation, thermostat operation, radiator efficiency, and sealing of the head gasket ect... Replacement of both Head gasket alone is just over 10 hours at which point it would be worth replacing the spark plugs, labor guide time to replace spark plugs separate to any other repairs is 1.3 hours.
I'm having my lower intake done at 400 cause the coolant is leaking out of it. they also said the water pump but i'm having that done at 178.
where are you going that you got a quote at 400?