Paul, I have the FFR heater, but never put it in; opted for a glove box instead. I drive in all types of our dry weather (6K miles)and don't have any issues. Don't see what real good it would do without a top. The wife does want the seat heaters, so I'll put them in this winter. I did buy her a blanket from www.Solutions.com that plugs into the cig lighter; she likes that. Cheers.
Are you working on the car today? I could drop by and chat?
I have the heated seats and really like them. I do not like the looks of the heater or the plumbing for them. Depends on what you can drive in. If you have cold weather, but can still drive (no gravel or snow on roads), then maybe the heater would be good. Winter weather in WA = wet, rain, wet, snow, gravel, wet, rain, more wet.
The firewall extension is nice, I've seen them, and as JBQ says, allows for both the G-box and the heater. I was finished before I became aware of this option. Next build, I will probably include both as they do add to the resale value a bit.
funny you should ask, i just had my first LONG drive here in Southern California. as you probably know, it's been way below average temperatures lately.
anyway, while driving on the freeway with the heat off, the only part of me that was cold was the top of my back behind my shoulders.
go figure - heated seats and a heater won't heat that part of the body!
anyway, to directly answer your question, there is an INSANE amount of heat that comes out of the vintage air heater. it mounts on the passenger side. the passenger gets heat from a door that opens in the heater unit, and there are also two tubes that normally go to the vents, but i have them to the driver footbox.
my legs actually got TOO HOT, so i am going to re-do the heat tubes and have them pointing directly back toward the driver (me.)
the heated seats are really inexpensive and look easy to install, i may add them some day. i imagine they are very helpful when the seat is ALREADY cold and you need to sit in them.
I've got both without a top. The seat heaters are really great, a must-have, they extend the fall/spring drivability period. I put "eyeballs" on the outlets of the heater so my passenger and I can direct the hot air anywhere we want. I also have the Firewall Forward kit from FFmetal, great deal! It also allowed me to run the plumbing, wiring, and brake lines out of the bottom of the firewall to keep the engine bay tidy.
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