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jamis1970 · Joined: 08 Oct 2010 Posts: 56 Location: big bear lake 92315

On a whim I decided to check out my gutless heater fan. It usually only blows weak. I ran some test leads direct from heater fan to battery. She was blowing like a jet engine. I then bought a 2.00 toggle switch and mounted it on my lower guage panel and ran new wires from battery to toggle swith to fan and ran new ground from fan to battery neg. Now in the chilly morning i start my car flip my toggle switch and presto... high volume air from my heater fan. I mean jet wash... lol. Can any of you enlighten me if this is dangerous to do? It seems to work excellent. Its only been installed a few days but its been incredible.
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1979 924 N/A Not Fast, but a BLAST to drive.

stevekat · Joined: 19 Jan 2008 Posts: 719 Location: Los Angeles, CA

Keep a fire extinguisher handy, and make sure to fuse the circuit.
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"Never get out of the boat. Absolutely goddamn right. Unless you are goin' all the way."

Gone to new home: '81 924T, US version, CGT Intercooler, UTCIS-PT, Euro DITC, Greddy Trust MBC, Forged Fuchs Flat Dish 6's, Factory Recaro's.

jamis1970 · Joined: 08 Oct 2010 Posts: 56 Location: big bear lake 92315

Ive got one of those inline fuses on it now. Any idea of how many amp fuse i should use 5, 10, 15, 25, ect. Your fire extingusher comment is making me sweat. Discuss.
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1979 924 N/A Not Fast, but a BLAST to drive.

stevekat · Joined: 19 Jan 2008 Posts: 719 Location: Los Angeles, CA

Being semi-facetious with the fire extinguisher suggestion.

If you are fused you are probably OK. Not sure what rating fuse. Others may be able to chime in on that.
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"Never get out of the boat. Absolutely goddamn right. Unless you are goin' all the way."

Gone to new home: '81 924T, US version, CGT Intercooler, UTCIS-PT, Euro DITC, Greddy Trust MBC, Forged Fuchs Flat Dish 6's, Factory Recaro's.

Ozzie · Posted: Fri Sep 23, 2011 9:19 pm Post subject:

Your probably going to run too cold.

Normal operation- Fan runs fast when motor running and is hot.
After shut down the fan runs at slow speed until the thermo switch cuts out.

There is a resistor in the circuit that is bypassed by the relay to run the fan at full speed. Sounds like a fault in the wiring, relay, resistor or thermo switch.

16A fuse
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Porsche 924 1984 (UK import) NA
Its AUTO and its BLACK
Montego Black on black/red
Engineer of Electro/Mechanical Systems Maintenance

Grenadiers · Posted: Sat Sep 24, 2011 2:38 am Post subject:

He's talking about his in-cab heater system. I did the same thing on Spike, but ran it thru a relay, much safer than just using a switch.
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'83 944 Track car.
'88 924S Track car.
'89 944 Turbo
2004 Winnebago Vectra monster RV
2012 Jeep Wrangler
2014 Kia Soul
2001 Ford F350 powerstroke

Rasta Monsta · Joined: 12 Jul 2006 Posts: 11733 Location: PacNW

stevekat · Joined: 19 Jan 2008 Posts: 719 Location: Los Angeles, CA

Good idea. But isn't the heater fan control on the 1981 and earlier actually a flat rheostat? I think the 1982 got a multi-position switch.
_________________
"Never get out of the boat. Absolutely goddamn right. Unless you are goin' all the way."

Gone to new home: '81 924T, US version, CGT Intercooler, UTCIS-PT, Euro DITC, Greddy Trust MBC, Forged Fuchs Flat Dish 6's, Factory Recaro's.

Grenadiers · Posted: Sat Sep 24, 2011 6:42 am Post subject:

Uh, there was still a 'few' wires to sort out, even though all the heater control wires were attached. I might have missed one.
_________________
'83 944 Track car.
'88 924S Track car.
'89 944 Turbo
2004 Winnebago Vectra monster RV
2012 Jeep Wrangler
2014 Kia Soul
2001 Ford F350 powerstroke

Ozzie · Posted: Sat Sep 24, 2011 8:09 am Post subject:

Rasta Monsta · Joined: 12 Jul 2006 Posts: 11733 Location: PacNW