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gml · Joined: 04 Mar 2021 Posts: 133 Location: Ontario Canada

I'm replacing the coolant expansion tank so I'll be draining the system. I have a new water pump and v-belt as well which I'll install.

Any other jobs that I should do while the coolant is drained out of the system?
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George

1982 924 NA 5-speed

924RACR · Posted: Mon Jun 16, 2025 3:41 am Post subject:

Thermostat would seem like an obvious one, if you don't know when last replaced.

Could also consider having the rad itself cleaned, pressure tested...
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Vaughan Scott
Webmeister
'79 924 #77 SCCA H Prod racecar
'82 931 Plat. Silver
#25 Hidari Firefly P2 sports prototype

Raize · Joined: 18 Sep 2013 Posts: 337 Location: Scotland

If your heater controls don't work it could be an opportunity to replace/free up that valve.

And it's an opportunity in general to replace any hoses that are really suspect.

chuck21401 · Joined: 20 Feb 2005 Posts: 573 Location: Annapolis, MD

Probably not a concern with 924NA but in my car I drained the system to install lower temp fan switch and new thermostat.
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1981 Porsche 931 w/S1 engine & g31 transmission. Water-cooled intercooler

Beartooth · Joined: 05 Apr 2022 Posts: 280 Location: Roberts, MT

+1 on having the radiator checked over and boiled out. You may want to have it rodded out, depending on what they find (not an automatic though: it could be pretty clear if coolant services were kept up on). Mine was half-blocked - not surprising given the level of neglect, and I doubt it would have cooled adequately. Also, like Raize said, least look over the hoses if you're uncertain on them: originals are definitely a liability, but you might not be able to replace them all.
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1980 931 diamond in the rough