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1998 S70 Starting and Heating Problems...Related? S70 1998

posted by  ian f. on  Thu Jan 27 07:35 CST 2005
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last visit: Sun Jan 30 15:23 CST 2011
[RELATED]

Hi all,

I usually don't post in the FWD forum as I drive a 945, but this is a question I am attempting to answer for my ex-wife (who drives my kids around).

Recently she stated that the radiator cooling fan funs all the time. It runs from the time the car is started under several minutes after it is shut off.

Around the same time this started, the car was difficult to start. It would take several attempts before it would catch.

Finally, the temp gauge only goes half as high as it used to while the cabin never heats up.

Keep in mind that since this has started the temperatures here in the Northeast have ranged from 0F to 30F. The majority of the last couple of weeks has been teens and below.

I am speculating that the thermostat is stuck open and that is causing the low coolant temps/low cabin temps but I was also wondering if there could be an engine coolant temp that is telling the ECU that the engine is already to hot, hence radiator fan running at startup and the hard starting.

Have any of you had a similar problem or have any insight?

It's supposed to be in the 30's this weekend so I was going to change out the thermostat quickly to see if that is the cause of any of the problems.

TIA,
Ian







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    1998 S70 Starting and Heating Problems...Related? S70 1998

    posted by  someone claiming to be cn on  Thu Jan 27 14:42 CST 2005 [RELATED]

    Yes,

    1. Thermostat can be stuck open. After 60-70K miles, the Thermostat is no longer reliable.
    Replacement is straightforward. The KEY thing here is a long Torx screwdriver:

    http://www.matthewsvolvosite.com/tstat.php

    I did it without draining the coolant (it was only one year old).
    However, this procedure will cause a loss of roughly 1 liter of coolant anyway.

    I bought my thermostat from here for approx. $15.00:
    http://www.foreigncarpartsonline.com/


    2. RE: Radiator Fan running.
    Maybe the sensor is acting up.
    This may be the source of battery drain as the fan consumes alot of current.

    Look down below the thermostat area along the engine block.
    Follow the ECT wire as far as you can see it.
    Mice like to chew on volvo wire harnesses.
    I have seen a few where the mice chewed on the ECT wire
    and caused the fan to run all of the time.


    Good Luck

    cn
    1998 V70 55K miles







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    1998 S70 Starting and Heating Problems...Related? S70 1998

    posted by  V70BB on  Thu Jan 27 14:35 CST 2005
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    Hi Ian,

    The short story is, replace both the t-stat and the ECT (reads the coolant temp), and this problem should be solved. Had the same symptoms on my 98 V70 back in Jan 2003.

    BB








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      1998 S70 Starting and Heating Problems...Related? S70 1998

      posted by  someone claiming to be 082097 on  Thu Jan 27 17:09 CST 2005 [RELATED]

      Is this the ECT you are refering to?

      http://img.eautopartscatalog.com/live/P403662731OES.JPG








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    You are good S70 1998

    posted by  KlausC on  Thu Jan 27 14:32 CST 2005
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    last visit: Fri Oct 24 10:15 CST 2014
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    The ECU receives a signal from the temp sensor which is next to the thermostat. In your case the thermostat is open all of the time telling the ECU that it is hot.

    Easy fix,

    Klaus
    --
    98 V70Rawd(101Kmi), 95 854T(85K mi), 75 164E(173K mi)








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      You are good S70 1998

      posted by  ian f. on  Thu Jan 27 17:10 CST 2005
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      last visit: Sun Jan 30 15:23 CST 2011
      [RELATED]

      Thanks Klaus!

      Bear with me...by easy fix, do you mean replace the thermostat?

      Thanks,
      Ian








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        You are good S70 1998

        posted by  KlausC on  Fri Jan 28 05:46 CST 2005
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        last visit: Fri Oct 24 10:15 CST 2014
        [RELATED]

        The thermostat should have been replaced by now. Everything working OK?

        Klaus
        --
        98 V70Rawd(101Kmi), 95 854T(85K mi), 75 164E(173K mi)








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          You are good S70 1998

          posted by  ian f. on  Sun Jan 30 14:37 CST 2005
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          last visit: Sun Jan 30 15:23 CST 2011
          [RELATED]

          It was the thermostat.

          Replaced it in about 10 minutes and all is right with the world.

          Thanks for the help guys!

          Ian


          /now slinking back to the RWD forums...








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          You are good S70 1998

          posted by  ian f. on  Fri Jan 28 07:29 CST 2005
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          last visit: Sun Jan 30 15:23 CST 2011
          [RELATED]

          I picked up a thermostat this morning and will replace it tomorrow when I go over to get the kids.

          Thanks, and I will be sure to post a follow-up.

          Ian







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