Re: Wierd cooling/coolant system prob>> more - Saab 900 Bulletin Board - Saabnet.com
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How old is your water pump?
The water pumps are very small belt-driven versions of the centrifugal pumps we specify all the time in my biz. The area right behind the impeller can be a low-pressure area (lower than system pressure) under some conditions. When the seal starts to go, the pump can suck air through the seal, especially if you're running the engine at high RPMs (I can't *imagine* you doing this, of course [LOL]).
Look for a telltale white stripe on the downpipe in line with the water pump pulley.
I experienced something similar with my '89 SPG. Changing out the WP cured it.
posted by 66.21.16...
Posts in this Thread:
- Wierd cooling/coolant system prob>> more, sab, Sun, 3 Nov 2002 18:06:40
- Re: Wierd cooling/coolant system prob>> more, RS , Mon, 4 Nov 2002 09:51:01 <-- Viewing This Message
- Re: Wierd cooling/coolant system prob>> more, Alex Bucell, Sun, 3 Nov 2002 22:46:27
- Re: Wierd cooling/coolant system prob>> more, Kevin K , Sun, 3 Nov 2002 20:03:44
- also> ive bled all air from coolant system twice!nm, sab, Sun, 3 Nov 2002 18:09:01
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