On my Volvo 440 (1992 1.8 LI with single point injection) the engine temperature warning light is always on. The gauge seems to work okay and fluctuates between low and middle (although it does seem to take a long time to move from the cold position).

What might the cause of this be?


  • Which year is your car and what engine does it have? They made this model between 87-97 and used six (6) different engines. It could be there are to separate temperature sensors for your engine temperature, one for the gauge and one for the idiot light ... knowing the year/engine will help us diagnose. – Pᴀᴜʟsᴛᴇʀ2 Mar 1 '14 at 15:25
  • It is the 1992 1.8 litre LI model – Michael Mar 1 '14 at 16:06
  • With single point injection – Michael Mar 1 '14 at 16:14

Check your coolant level in the reservoir. It may just be a low coolant warning light

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  • Coolant level is fine – Michael Mar 3 '14 at 9:09

Coolant level sensor might be bad.

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  • Care to expound or give explanation? – Pᴀᴜʟsᴛᴇʀ2 Mar 4 '14 at 20:01
  • On the cars I'm familiar with, the coolant level sensor trips the same light as the classic "overheating" sensor. If the coolant level sensor fails it can cause your cooling system error light to come on even if the system is full and operating perfectly. Sensor can be tested per the manual (normally continuity or resistance). – Brian Knoblauch Mar 4 '14 at 21:17
  • You should have put that into your answer to begin with ... while I didn't down vote you, I'm sure with this explanation it would not have been down voted in the first place. – Pᴀᴜʟsᴛᴇʀ2 Mar 4 '14 at 22:29

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