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Discussion Starter · #1 · (Edited)
On cold-ish mornings (this is Florida, so think 40-50) I have noticed water temp gauge on my '03 9-5 Linear reading lower but steady on road, coming to horizontal when in town traffic. Once or twice the gauge has dropped to no reading, coming back after an engine restart (although whether that happened while running or just never started with engine I am not sure). Mileage has dropped +/-3mpg since I noticed temp drop.
Time for a theromstat? Is the periodic gauge failure related? What coolant is recommended to replace what I'd lose changing thermo?
Thanks for any help.
 
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