First off, make sure you have the 4 componets of good heat:
-Standard thermostat (usually 192 degrees) that is known to be
good. They go bad, I've had bad ones out of the box.
-Drain, FLUSH, and refil the system with good anitfreeze. Use a
cooling system flush product then power flush system ($4.95 or
so) and run it until it runs clear.
-Upgade the heater fan motor (1991 and older) with the GM style
blower motor
-Rebuild or replace the heater core on any vehicle where the
flush process yields lots of red crud. I have been paying around
$35 for a complete heater core rebuild including disassembly, rod
out, reasembly, and testing.

Total cost is less than $100 for all items.

If that is not enough for the back seat folks, there are a series
of auxilary heaters (jcwhitney.com) that are plumbed into the
cooling system, use a 12 volt fan to push the air around. Used on
RV's, school buses, 15 passenger vans, etc. Cost is about $200,
they work GREAT, install is a pain.

cheers

MudPuppy1976 <"moc.rr.pacyn"@67lamina wrote:

> i have a 93 YJ with a soft top. due to monetary considerations, it does
> not have a hard top for the winter, and due to off-road conditions, has
> no carpets either.
>
> in the winter, since i'm probably just insane or just very well
> insulated, i have no problems with wearing a a coat whilst in the driver
> seat. however, some of my non-jeep friends (no, can't get trade em for
> 'jeep-friends') have the most common complaint about the lack of heat,
> especially in the rear seat.
>
> i'm not even thinking about those awful ceramic heaters to cook my
> alternator. just wondering if there are any other alternatives or mods
> available other than tossing another blanket to the back seat.
>
> probably a lost cause, heheheh.

 

First off, make sure you have the 4 componets of good heat:
-Standard thermostat (usually 192 degrees) that is known to be
good. They go bad, I've had bad ones out of the box.
-Drain, FLUSH, and refil the system with good anitfreeze. Use a
cooling system flush product then power flush system ($4.95 or
so) and run it until it runs clear.
-Upgade the heater fan motor (1991 and older) with the GM style
blower motor
-Rebuild or replace the heater core on any vehicle where the
flush process yields lots of red crud. I have been paying around
$35 for a complete heater core rebuild including disassembly, rod
out, reasembly, and testing.

Total cost is less than $100 for all items.

If that is not enough for the back seat folks, there are a series
of auxilary heaters (jcwhitney.com) that are plumbed into the
cooling system, use a 12 volt fan to push the air around. Used on
RV's, school buses, 15 passenger vans, etc. Cost is about $200,
they work GREAT, install is a pain.

cheers

MudPuppy1976 <"moc.rr.pacyn"@67lamina wrote:

> i have a 93 YJ with a soft top. due to monetary considerations, it does
> not have a hard top for the winter, and due to off-road conditions, has
> no carpets either.
>
> in the winter, since i'm probably just insane or just very well
> insulated, i have no problems with wearing a a coat whilst in the driver
> seat. however, some of my non-jeep friends (no, can't get trade em for
> 'jeep-friends') have the most common complaint about the lack of heat,
> especially in the rear seat.
>
> i'm not even thinking about those awful ceramic heaters to cook my
> alternator. just wondering if there are any other alternatives or mods
> available other than tossing another blanket to the back seat.
>
> probably a lost cause, heheheh.