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the heater is a charmglow gas ventless wall heater
You clean bricks in a gas wall heater by turning the gas off and scrubbing them with a non flammable cleaner.
Factors to consider when shopping for a natural gas wall heater is the reputation of the brand, the length of the warranty and the safety features of the heater.
Disconnect the heater lines going into the fire wall from under the hood. Remove the panels from under the dash. At this point you should be able to remove the heater cover and remove the heater core.
Would depend on what year impala On a 63 impala or many of the early ones you need to remove the passener side fender. The remove the power wire from the blower motor. Then remove the heater hoses. then remove the heater box from the fire wall. the heater core is inside that box. Newer models I am not familiar with
Some natural gas wall heater brands sold at the Home Depot include Williams and Broan. You can find a full listing of available heaters at the Home Depot website.
There are many advantages to using a propane wall heater instead of natural gas. Propane lasts longer and doesn't give off any oxidants (fumes). Also propane is around the same price as natural gas.
beat it out with a hammer or gas it out with a oxy accetylene gas set
There are several places that you can buy a wall heater at a good price depending upon whether you are looking for a natural gas heater or electric. Home Depot, Lowes, and Menards are good places to find wall heaters at reasonable prices.
You need to recover the R134 charge, remove the whole dashboard, then remove the a/c heater box to get to the heater core. The heater core should be accessible right next to the gas pedal. No dash removal is necessary.