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cooling fan doesn't come on at idle, temp gauge doesn't read high

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    #1

    cooling fan doesn't come on at idle, temp gauge doesn't read high

    Yesterday I changed my coolant, because it was due and the reservoir was low. They say to fill it up, then warm the engine up, then top it off.

    The shop manual says to run it with the rad cap off until the fan comes on 2x. The fan didn't come on, instead the fluid boiled over.

    So, I put the cap back on and left it running to see if the fan would come on. It didn't. Just steam from the spilled coolant. I stepped on the gas and held it at 3000+ for a few minutes to heat it more. Just as I was giving up, they started! So they work, just not as cool as they're supposed to.

    Furthermore, my temperature gauge has never read over about 1/3 of the way up.

    I'm living at high altitude (8300 ft.) so the boiling point is much lower and maybe the engine was cooling by evaporation with the cap off. However that doesn't explain the fans staying off when the cap is on.

    I don't suppose it's really anything to worry about, but should I replace the entire thermostat? I guess I should take it down to the valley (only 5300 ft!) and check the behavior there.
    Tags: thermostat
    #2
    Eek, now my S light blinks! The transmission dipstick was bone dry when I checked it, so I added a pint per Haynes, now it's a lil high but it drives OK, should I vacuum some back out or is the S light complaining of something else?

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      #3
      TCU is complaining about the "NC speed sensor" which controls the lockup solenoids and is apparently on the right rear of the A/T. Why would that be affected by the coolant change?? Maybe I really overheated everything before.

      Will clean it off tomorrow and keep y'all posted .

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        #4
        the cap allows the water to have a higher boiling point by allowing an increase in the pressure.

        You can not warm a car up to full op temp with the cap off. Especially being at higher altitude. I don't know what shop manual that is but it's completely wrong.


        Fill it up...use either a 70 parts water to 30 parts coolant or a 50/50 mix...either is fine...bleed using the bleeder valve on top of the therm. housing...put the cap on...fill the res tank to the FULL line...run car and let 'er warm up.

        When your temp gauge gets to about halfway the fans should kick on...if they don't, then the temp switch may be bad...when facing te engine, look at your upper hose...follow it from the rad to the head...the FIRST sensor you come to is that switch.
        ____

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          #5
          Yeah, that's what I ended up doing…

          That's my problem, both the gauge and the switch may be off. My gauge never gets near halfway. It does correctly indicate if I'm cold but it peters off at 1/3 way. Anyway the fans do kick on, at some point :P . At this point my first concern is the NC speed sensor.

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