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  1. #1

    Join Date
    27 Feb 2022
    WI USA
    2004 9-5 ARC
    Thumbs Up:   0

    No heat!

    Hey gang, just bought an 04 9-5 ARC yesterday with 140k miles.
    Drove it home about 40 miles yesterday and noticed the heat wasn't the greatest. I got home, had to resolder the headlight cube relay contacts and some other random things.
    That takes us to today. I had to put a new battery in it as I'm guessing the car has sat for quite a while. Now with the heat on full blast, it's cold. I did the recalibration of the HVAC system after the new battery, I replaced the coolant temp sensor and thermostat today, and the heat is nonexistent. The temp gauge is right smack dab in the middle, and sometimes a little less than halfway.
    My scanner shows the coolant temp is 185F (put a 180 thermostat in).
    I'm leaning towards it being a blocked heater core? Is that correct? Will a coolant flush resolve my issue? New core? PLEASE HELP! It's 10F here and no heat sucks!

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  2. #2
    Administrator nordwulf's Avatar
    Join Date
    30 Jul 2010
    USA - Netherlands
    previous: 2006 9-3, 2001-06 9-5, 2011 9-4X
    Thumbs Up:   134
    You performed all the steps and replaced items we usually suggest. You mentioned you calibrated the ACC system but didn't mention if there were any error codes showing?

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  3. #3
    Saab Enthusiast
    Join Date
    30 Jan 2017
    Trumbull, CT
    2007 9-5 2.3t
    Thumbs Up:   3
    Interesting. I am having very similar issues. I changed the coolant sensor and plan on changing the thermostat. My gauge reads about the same as yours, but at times dips to 1/4 or lower. I also was going to replace the by-pass valve thinking that it may not be operating correctly. I sometimes have heat and sometimes don't. Sometimes I drive a 1/2 hr into work with no heat and when I go home, it works fine. As for the heater core, can you check the inlet and outlet temps to see if one side is hot and the other cooler or cold?

    0 Not allowed!



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