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Old 16-10-2019, 06:04 PM   #271
InstantCustard
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Looks like there’s a sticker on it, what’s the part number?


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Old 16-10-2019, 06:11 PM   #272
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Quick google search says it’s the heater bypass valve and it’s a SAAB part


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Old 16-10-2019, 06:16 PM   #273
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The is fitted to the later ZR/ZS and has a one way valve fitted to it.

It's a common failure making the heater have no heat. A lot of garages then claim it's head gasket but really it's this. Saab do a direct replacement which is better quality.

Personally, I would remove it. I ran Phoenix for 8 years using the pipework just like a stock Mini. It does mean that with the heater set to cold, no coolant goes through the matrix. It never seemed to affect the cooling, even on track or hot days.
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Old 16-10-2019, 06:53 PM   #274
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Mine is setup without any “SAAB valve” too, I have an in-line heater valve from an MPi Mini and then a couple of tees and a bit of hose before that to bypass the heater valve when it’s shut, as Andrew says, it means no coolant runs through heater matrix with the valve shut but if it did then you wouldn’t get any control over the cabin heat.
Had no issues with this setup with regards to cooling.


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I love it
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Old 16-10-2019, 07:46 PM   #275
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Thanks guys


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Old Yesterday, 05:54 AM   #276
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I've run a similar set up like Dan's, so when the heater valve is closed the coolant still circulates around the engine through the bypass the other side of the thermostat. The engine warms up in a couple or 3 miles and has no issues when giving it the beans.
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