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Saab 9-3 Sport Saloon / Convertible / Combi (Wagon/Estate) / Turbo X / AWD (2003 on) / Slow warm up 2.0T Aero
« on: 19 December 2023, 08:34:04 AM »
This one has been bugging me for some time.
When I got the car, I noticed it was slow to warm up. Changed the stat for a non-OEM one and still the same, so swapped it for a genuine Saab and replaced the temp sensor. Checked the temp sensor resistance at 20 deg C and OK.
Still slow to warm up compared to our other one (yes we have 2) yesterday (not avery cold day) it struggled to get above 74 deg C cruising at around 50mph.
Have I been unlucky and had 3 faulty thermostats and 2 faulty sensors? I'm thinking maybe a thermostat issue as the cabin heater takes some time to warm up. I was wondering if there's any possible bypass circuit?
WIS isn't terribly clear other than saying that (unlike the B2x5 and B2x4 heads) the stat is in the return from the radiator, not the flow, which probably accounts for it being 80 deg C not 89, but even running in summer it never seems to really get up to the high 80s.
Ideas?
When I got the car, I noticed it was slow to warm up. Changed the stat for a non-OEM one and still the same, so swapped it for a genuine Saab and replaced the temp sensor. Checked the temp sensor resistance at 20 deg C and OK.
Still slow to warm up compared to our other one (yes we have 2) yesterday (not avery cold day) it struggled to get above 74 deg C cruising at around 50mph.
Have I been unlucky and had 3 faulty thermostats and 2 faulty sensors? I'm thinking maybe a thermostat issue as the cabin heater takes some time to warm up. I was wondering if there's any possible bypass circuit?
WIS isn't terribly clear other than saying that (unlike the B2x5 and B2x4 heads) the stat is in the return from the radiator, not the flow, which probably accounts for it being 80 deg C not 89, but even running in summer it never seems to really get up to the high 80s.
Ideas?