Heater core 97 avalon

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Air conditioning needs to be evacuated prior to removing the heater box under the dash so it is probably not a job you want to tackle at home. Its about 5 to 5.5 hour job labor wise.

need to remove glove box assembly all under dash covers, in the engine compartment need to remove heter control valve hoses and blow them with shop air... to prevent a mess in the interior of vehicle, the radio also needs to come out to get air ducts out, there is some phillips head screws that hold the pipes in place, then should be able to pull it ou