'09 2.4L Overheating

Discussion in 'Detailing and General Maintenance Forum' started by blucivic1, Jan 10, 2018.

  1. blucivic1

    blucivic1 New Member

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    First post on this forum. Here's a preliminary summary:

    1. Car has been overheating for the last month
    2. Bleeding the air from the coolant fixes the problem for a week
    3. Coolant system pressure test and head pressure test reveals no leaks
    4. Coolant and oil look fine
    5. Replaced the primary thermostat Saturday and now overheats faster
    6. Constantly bleeding air out of the system
    7. Overheating is first followed by the heat going cold and the upper hose is hot while the lower hose is cold, even with the new thermostat

    I have a 2009 2.4 l that recently started overheating last month. Driving home and temperature light came on. Shut the car off immediately. Waited about 30 minutes and drove the car about three miles home with the heat on. The next day, drove the car and the temperature started to rise. Bought a new thermostat but before I did, I put the old one in a pot of hot water and it opened just fine. Bleed the air and the car was fine for a week. Began to overheat again, bleed the air, fine for a week again. Did this for about another week before getting it checked out. Took it to Pep Boys for a coolant pressure check. They checked the coolant system and head for leaks and found none. Oil and coolant also looked fine. Drove for another week and started overheating. Took it back to Pep Boys and they suggested replacing the thermostat. Went to the dealership and got the primary 170°. Replaced it this past weekend and everything was fine until. Monday on the way home, temp started to rise. Bled the system a total of 4 times since Sunday and still going up to 3/4 on the way home. Thinking that replacing the second thermostat may fix it. Any other suggestions?
     
  2. Intrepid

    Intrepid Active Member MOTM Winner!

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    Definitely replace the second T stat since everything elase checks out fine.
     
  3. blucivic1

    blucivic1 New Member

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    Thinking maybe replace the whole housing as well since it has to come off to get to the thermostat. Think that may be overkill?
    [​IMG]
     
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  4. 5rebel9

    5rebel9 Active Member Site Supporter Level 1 Military

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    It may be a little overkill,BUT being plastic and over the long term age of having to deal with the extreme temps and constant pressure of the coolant system, it would be GOOD preventive maint. From past postings you may also want to replace the plastic filler unit also with a new radiator cap. Have read of a number of the filler assemblies breaking. Good luck, and keep us informed on how things go!
     
  5. blucivic1

    blucivic1 New Member

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    Went back to the dealer and decided to just purpchas the secondary thermostat. Had pep boys install it and so far so good after 2 weeks. Was a strong smell of antifreeze after, but it went away. Can sometimes still hear bubbles making their way out the overflow reservoir. Not sure what that means right now.
     
  6. 5rebel9

    5rebel9 Active Member Site Supporter Level 1 Military

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    Glad to hear that things are improving. Just keep an eye on coolant levels that it is not loosing coolant somewhere. After 2 weeks any trapped air should have worked its way out of the system by now.
     
  7. blucivic1

    blucivic1 New Member

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    Yeah, I need to check it. Had a strong smell of antifreeze yesterday and the wife said that the temp briefly went above the half-way point. Seems like it isn't 100% fixed, just not overheating as fast. Not sure what other avenue to pursue.
     
  8. 5rebel9

    5rebel9 Active Member Site Supporter Level 1 Military

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    Pull the spark plugs and check for a "washed" one(totally white clean looking) compared to the others. This would pretty much confirm or rule out a head gasket problem.
    The plastic housing and O ring seals of the thermostat housing are known to leak(can seep coolant OR draw in air, not a wanted thing).
    Also check the HVAC box drain for signs of coolant coming out on the ground, may have a heater core starting to go.
     
  9. blucivic1

    blucivic1 New Member

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    I'll check the spark plugs. If they are fine, may replace that coolant housing. I think that's as much as we're willing to do before it gets traded in.
     
    Last edited: Jan 29, 2018
  10. 5rebel9

    5rebel9 Active Member Site Supporter Level 1 Military

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    Good luck, and let us know what you find either way!
     

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