Mark,
Use LOTS of Kroil penetrating oil (or preferably their Penephite) on those hose couplings. Let it soak for a day, then do it again - may need to treat for several days, but everything I've used this on eventually could be disconnected.
It is best to try to keep the pipe that comes out of the firewall in good condition. Hoses can be replaced easily. Try not to damage the pipe - but some damage close to the connection 'might' be able to be repaired. I think they are copper.
Gary--
Use LOTS of Kroil penetrating oil (or preferably their Penephite) on those hose couplings. Let it soak for a day, then do it again - may need to treat for several days, but everything I've used this on eventually could be disconnected.
It is best to try to keep the pipe that comes out of the firewall in good condition. Hoses can be replaced easily. Try not to damage the pipe - but some damage close to the connection 'might' be able to be repaired. I think they are copper.
Gary--