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924RACR
Joined: 29 Jul 2001
Posts: 9129
Location: Royal Oak, MI, USA
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 Posted: Thu Aug 03, 2006 10:05 pm Post subject: 931 expansion tank (rad) cap - updated P/N |
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An FYI, I found a replacement for my coolant expansion tank cap last night (what some might incorrectly call a radiator cap). This is the screw-on type, not the push in and 1/4 turn style used on the 2.0L NA and the 2.5L cars, as common on many VW's.
The original P/N is 171.121.321. Replacement part listed in the parts manual is 171.121.321D.
The part I got that looks the same, except it's blue, is 443.121.321. Again, obviously, as you'd expect, it appears to be a pretty standard VW part...
Hopefully now my system will hold pressure and stop dumping coolant all over the place once the temp gets above the 3/4 mark... very embarrasing at the dealer...
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Vaughan Scott
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'79 924 #77 SCCA H Prod racecar
'82 931 Plat. Silver
#25 Hidari Firefly P2 sports prototype |
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scotchw
Joined: 14 Aug 2005
Posts: 30
Location: Basingstoke, UK
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| Posted: Tue Oct 03, 2006 10:25 am Post subject: |
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I just replaced my old expansion tank & cap with Porsche-supplied parts (couldn't even see coolant through the 'browned' old plastic!). Was surprised to see the blue cap too:
Actually the cap has a 996.106.447.01 no. & a different pressure relief design underneath.
One thing on exp tank too - look carefully in photo & you'll see that main outlet port on new tank is different length & angle than original 
Same part no. as original too - strange. Had to adjust hose to make it fit.
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'82MY 924 Turbo Euro RHD |
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924RACR
Joined: 29 Jul 2001
Posts: 9129
Location: Royal Oak, MI, USA
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| Posted: Tue Oct 03, 2006 9:54 pm Post subject: |
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I'll bet that makes the engine compartment look 10 times better!
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Vaughan Scott
Webmeister
'79 924 #77 SCCA H Prod racecar
'82 931 Plat. Silver
#25 Hidari Firefly P2 sports prototype |
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scotchw
Joined: 14 Aug 2005
Posts: 30
Location: Basingstoke, UK
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| Posted: Wed Oct 04, 2006 3:29 am Post subject: |
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It did until I went out for my maiden voyage after fitting it!
I also replaced a couple of w/pump hoses (the tstat one had been weeping for some time I suspect):
 
Now I've realised (looking at other threads) that my head gasket must have gone - my new expansion tank was blown up like a balloon after a 30 mile cruise on the highway 
Now that my cooling system is airtight its highlighted the 'real' problem behind my string of hose failures 
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'82MY 924 Turbo Euro RHD |
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