While checking for vac. leaks on my 83 300cd hvac syst. I burnt my finger on a vac. valve on the inside firewall, near the defroster pot and near what looks to be a computer, it's metal, has 2 rubber vac. lines and an elec. plug and gets very hot with key on and engine off. What is it? can I test it? It is very hard to get to, I can't see a vac. source for the 2 lines.
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