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B2524 · Joined: 02 Oct 2021 Posts: 15 Location: Templeton CA

I have a 77 924. I’m wondering if anyone has eliminated the steel line coming from the water pump that supplies water to the heater and branches off to the temp senders and the back of the head?
Is it needed to cool the head or just for flow to the sensors so they see the temp?
Thanks.
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It’s a sickness.

safe · Joined: 18 Mar 2017 Posts: 703 Location: Sweden

Yes its needed, its the return from the head.
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/Magnus, Stockholm Sweden
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Porsche 924 -79 NA, EFI and Turbo.
Porsche 931 -79
Porsche 911 -77, 3.2 Targa
Porsche 911 -69, 3.6, Coupe

Fifty50Plus · Posted: Fri Nov 05, 2021 2:57 am Post subject:

Yes, as Magnus said. It's needed even if you don't use it to feed hot water to the heater core.
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1979 924 NA race car H-Prod SCCA
1982 924 NA race car - Sold
1981 924 Turbo sold
1982 924 Turbo sold
1972 911 E race car - traded for Cayenne Diesel
1975 914 1.8 Building for H-Prod SCCA

MikeJinCO · Posted: Fri Nov 05, 2021 5:06 am Post subject:

On my track car with no heater I eliminated it for a while and it ran fine. But, I have since put it back as it comes from the furthest part of the system so air could easily get trapped back there, at which time bad things could happen. On a SBC they always referred to this line as a steam line.
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Mike

'67 MG Midget Dp
'71 Ocelot Dsr Kawasaki 1000(under rebuild)

Fasteddie313 · Joined: 29 Sep 2013 Posts: 2595 Location: MI

For best head cooling I think the heater core should be bypassed or T’d around..

Definitely not blocked off..
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80 Turbo - Slightly Modified