[ross79SC]

I have a 79 coupe in which the engine bay fan was weak so don't have that to compare to. When I initially did the backdate I had stock exhaust. With the stock exhaust I had trouble clearing badly fogged up windows on startup (Same climate as PNW), my car was had factory a/c (since removed at some point), so the upper lever controls both fresh air and fan speed. So to have the fan on, the fresh is fully open. So I'd have the fan on when warming up the car, but when I started to drive with the fresh air fully open the heat would get overwhelmed, so I'd close down the amount fresh air which shut off the fan which was fine until the the first stop light, then have to turn the fan back on. This fun cycle would repeat until the exhaust/car got fully warmed up.

I then installed SSIs which not only increased the volume of heat but also sped up the time to get usuable heat, usually by the time it comes down from 'fast idle'.

The final piece in the puzzle was that I discovered that non-factory a/c cars have two levers on the upper row that give the ability to control fresh air and the fan speed independently. So I bought a non a/c control with a broken face plate and swapped it into my car.

The increased/faster heat off of the SSIs speeds the whole process up, but now I can have the fan on to aid clearing windows while stationary and still limit the amount of fresh air for driving during the warmup phase... much nicer!