Heater core maximum pressure is a good question for the radiator shop. From experience, I know the 7 pounds would be OK, but 15 might leave you stranded somewhere when/if the heater core finally goes. The radiator shop guys should know, if you tell them that it came from a zero pound original system.
You might want to test the horn first to see if the 12-6 volt reducer has the chops to handle it without letting out the magic smoke.
You might want to test the horn first to see if the 12-6 volt reducer has the chops to handle it without letting out the magic smoke.
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