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1999 Civic – Coolant fan, Radiator, Thermostat

Home Forums Stay Dirty Lounge Service and Repair Questions Answered Here 1999 Civic – Coolant fan, Radiator, Thermostat

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  • #580638
    cb7ftwcb7ftw
    Participant

      So I noticed my coolant fan was not coming on. If I turn my key to ACC and jumper the plug at the coolant fan switch (The one next to the thermostat) my fan comes on. So I am pretty sure my coolant fan switch is not closing. This could be do to my thermostat not opening.

      With the engine running at normal tempeture, the upper radiator hose is hot, and the bottom hose is cool. Both are under pressure. The car get heat in the cab, and does not over heat.

      Does this sound like the thermastat is stuck close? Seems like the engine would over heat, if it was stuck close.

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    • #580642
      valdevalde
      Participant

        It could be just that engine isn’t hot enough for thermostat to stay fully open. And it needs to be even hotter for fan to turn on. If it’s cold and heater is on it uses lots of heat so it may take 10min to forever for fan to turn on. If it’s cold outside just turn heater plover off and see if it then eventually gets hot enough to turn fan on. If it appears to overheat just turn plover to full and it cools a bit.

        When engine heats from cold:
        1. Thermostat is closed (when engine heats you can see temp going up and feel heater blowing hotter)
        2. Thermostat partly open (radiator bottom hose gets warm)
        3. Thermostat is fully open (radiator hoses feel like same temperature) Fan is still off
        4. Radiator fan turns on

        Normally when driving (not cold) it stays at 2 and may sometimes go to 3. And when idling (standing still) it changes between 3 and 4.

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