Re: Firewall deadener/insulator installation
Posted by HH56 On 2023/10/14 23:14:53
If it is a Packard hot water heater it should be held to the firewall by nuts on the engine side. Believe that was the standard mounting method used until the 22nd series 48 models came out with fully integrated heaters. Aftermarket hot water heaters were common too so cannot offer any suggestions if it is an aftermarket unit but suspect the same mounting method. If you have something like the Southwind gasoline heater, it should mount similarly but you will also need to disconnect the small gasoline line. Doubt you would have the Kelch hot air heater and no ideas on how it mounts other than it should just be an air duct coming thru into the passenger compt.
On the Packard hot water heater, drain coolant down to below level of heater and loosen the hose clamps so you can pull the heater hoses off the tubes from the engine side. The hoses may be stuck to the tubes so try to keep any twisting or hard pulling on the tubes to a minimum. Disconnect defroster air duct hoses if so equipped and disconnect power wire(s) from the switch(es) under the dash edge. You could also cut the wires but if you do that, try to do it up under the dash so you can repair them by using a modern crimp on quick disconnect or bullet connector pair and have those out of sight. Make sure to label which wire is heater and which is defroster. When everything is disconnected remove the nuts from the studs and pull the heater straight back from the passenger side to get the tubing and studs out of the firewall holes. Have a rag handy to catch any coolant that might still be in the heater core from getting on any carpet or upholstery.
Here is a typical factory switch and wire installation from later models along with a couple of ebay photos of what is identified as a standard 37 and 38-9 heater showing the rear or engine side. Since heaters were also a dealer installed option some installs might not exactly follow Packard recommendations. The coolant tubes and about an inch of the threaded studs (circled in white) should be visible on the engine side of firewall in the location where the heater is installed.
Attach file:
37 heater.jpg (171.19 KB)
38-9 heater.jpg (178.34 KB)
heater.jpg (204.13 KB)
On the Packard hot water heater, drain coolant down to below level of heater and loosen the hose clamps so you can pull the heater hoses off the tubes from the engine side. The hoses may be stuck to the tubes so try to keep any twisting or hard pulling on the tubes to a minimum. Disconnect defroster air duct hoses if so equipped and disconnect power wire(s) from the switch(es) under the dash edge. You could also cut the wires but if you do that, try to do it up under the dash so you can repair them by using a modern crimp on quick disconnect or bullet connector pair and have those out of sight. Make sure to label which wire is heater and which is defroster. When everything is disconnected remove the nuts from the studs and pull the heater straight back from the passenger side to get the tubing and studs out of the firewall holes. Have a rag handy to catch any coolant that might still be in the heater core from getting on any carpet or upholstery.
Here is a typical factory switch and wire installation from later models along with a couple of ebay photos of what is identified as a standard 37 and 38-9 heater showing the rear or engine side. Since heaters were also a dealer installed option some installs might not exactly follow Packard recommendations. The coolant tubes and about an inch of the threaded studs (circled in white) should be visible on the engine side of firewall in the location where the heater is installed.
Attach file:
37 heater.jpg (171.19 KB)
38-9 heater.jpg (178.34 KB)
heater.jpg (204.13 KB)
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