Re: Need help diagnosing coolant leak - Saab 9-5 Bulletin Board -

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Re: Need help diagnosing coolant leak
Posted by three_jeeps (more from three_jeeps) on Fri, 29 Sep 2017 07:59:42

In Reply to: Need help diagnosing coolant leak, Mike Keller [Profile/Gallery] , Fri, 29 Sep 2017 05:17:47
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I don't think the oil leak and coolant leak are related. If the oil leak is a few drops, you may want to check the valve cover gasket.

As far as the coolant leak, when my heater bypass valve failed, it had similar characteristics to yours (I didn't smell coolant until the valve *really* got bad. The leak spot on my 2004 9-5 Arc was near the center of the firewall, slightly towards to drivers side, not passenger. (When I had my car to the local saab indy garage, the guy diagnosed it as a radiator leak...imagine my rage after I spent a good afternoon R&R the radiator only to have the leak show up the next day)

You can diagnose the bypass valve by putting your hand around it and feel for coolant on the exterior around it or the firewall since (at least on mine) the valve is tywrapped to the firewall), or, put a rag around the valve, drive for a bit, then feel the rag.

If it is the valve, as other point out, you can get hoses that bypass and eliminate the valve. I considered this but could not find clear instructions or pictures of how the new plumbing should be routed.
A company produced a bypass kit (Mckane?) but several people reported it is NLA...I looked but could not find it.

I opted for a new valve (Febi) - just beware that the vacuum nipple on the Febi valve is smaller than the ID of the vacuum line making for a loose connection. I had to cut off (with a dremel) the two plastic 'guards' that were around the vacuum nipple and I used a tiewrap to secure it. I also cut back the vacuum line to remove the expanded end caused by the old valve.

Getting the OEM hose clamps off is a real treat...I could not find my flexible hose clamp tool and I used hose ring plyers. I replaced the OEM clamps with screw tightening hose clamps. Easier to replace then next time the valve fails.
Also, the hoses are all the same size and easy to mix up on the valve. mark the hoses and corresponding valve locations.
Good luck

posted by 128.237.2...

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