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91 Civic Hatch Thermostat Replace?

Discussion in 'Engine Tech / Drivetrain' started by 1991CivicEf9, Oct 6, 2011.



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  1. 1991CivicEf9

    1991CivicEf9 Cruiser

    Joined:
    Sep 29, 2011
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    31
    Location:
    Orange, CA
    I have a bad thermostat in my 91 civic hatch. Stock motor. Is there anything else I should replace while doing the thermostat? My buddy told me to replace the Thermostat switch aswell but i'm not sure. Also, how would I go about replacing the thermostat? Remove the top rad hose that goes to the engine and go from there?
     
  2. Kensai

    Kensai ♪♫♪♫♪~ Registered VIP Registered OG 5+ Year Member

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    If you ran low on coolant its probably a good idea to replace the coolant temp. sensor.

    Check the hoses while you're at it as well!
     
  3. Blood_Shot

    Blood_Shot Banned Registered VIP

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    how do you know its bad

    when was the last time you had that fluid changed?

    things to think about
     
  4. jlicrx

    jlicrx New Member Registered VIP 5+ Year Member

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    first off, you should get a service manual for your car and not listen to your buddies - the manual will tell you everything you need to know in making repairs

    second, your buddy is most likely referring to the switch that is on the thermostat housing on 92 and up cars, but it is not located there on a 91 - that switch is the cooling fan switch - on the 91, the cooling fan switch is on the back of the block next to the oil filter - if your cooling fan is working, the switch is o.k

    third, the thermostat is not located where the top radiator hose goes into the engine - it is located where the bottom radiator hose goes into the engine, which is just behind and below the distributor - this is the instructions from the 91 factory service manual for replacing the thermostat

    [​IMG]
     
  5. 1991CivicEf9

    1991CivicEf9 Cruiser

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    Well for one, When I run my car till it gets hot (a few miles or so) and turn it off, it won't start back up. It just cranks but does not turn over and actually start. I replaced the ECT sensor, so it was not that. So I turned the car off when it was hot, took the rad cap off, and tried to start it again. It shoots fluid like a fountain, so basically the thermostat isn't opening up to let it go thru the engine.
     
  6. jlicrx

    jlicrx New Member Registered VIP 5+ Year Member

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    not starting when the engine is hot can sometimes be a faulty igniter in the distributor - do you have any codes showing on the ECU? - a faulty igniter would be code 15, meaning the red LED on top of the ECU will be flashing 15 times
     
  7. 1991CivicEf9

    1991CivicEf9 Cruiser

    Joined:
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    Location:
    Orange, CA
    Wouldn't that throw a CEL?
     
  8. Blood_Shot

    Blood_Shot Banned Registered VIP

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    yes he said it thows code 15
     


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