1. Attachments are working again! Check out this thread for more details and to report any other bugs.

Overheating under acceleration

Discussion in 'Gen 3 Prius Main Forum' started by Ray Glenn, Jun 14, 2020.

Tags:
  1. Ray Glenn

    Ray Glenn Junior Member

    Joined:
    Jun 14, 2020
    3
    1
    0
    Location:
    Alabama
    Vehicle:
    2012 Prius
    Model:
    III
    I have a 2012 and recently the temp light starts flashing when it is under heavy acceleration. If I turn off the AC it immediately goes away. I ran an OBD scanner today while driving for about 20 minutes and the temp never went above 200. On the way home I accelerated hard going up hill and the temp shot up to 240. I let off the gas, and turned off the AC and the temp dropped back down to about 200. I drove the rest of the way home with no AC and the temp stayed below 200. The car has over 200k miles. I disconnect the EGR sensor about 18 months ago when it clogged. The car has been running perfect since I did that with no increase in temp. I monitored the temp for a couple of weeks after disconnecting the EGR and it did not change at all.
     
    #1 Ray Glenn, Jun 14, 2020
    Pluggo likes this.
  2. sam spade 2

    sam spade 2 Senior Member

    Joined:
    Mar 31, 2018
    7,035
    2,782
    0
    Location:
    USA
    Vehicle:
    2017 Prius c
    Model:
    Four
    The engine is not really heating up the coolant that fast.
    I suspect that having the "EGR sensor" disconnected is causing this false report........and you probably should fix that right.
     
    #2 sam spade 2, Jun 14, 2020
  3. Ed Beaty

    Ed Beaty Active Member

    Joined:
    Jul 13, 2018
    334
    309
    0
    Location:
    Salt Lake City
    Vehicle:
    2010 Prius
    Model:
    IV
    What he said.....
     
    #3 Ed Beaty, Jun 14, 2020
  4. Ray Glenn

    Ray Glenn Junior Member

    Joined:
    Jun 14, 2020
    3
    1
    0
    Location:
    Alabama
    Vehicle:
    2012 Prius
    Model:
    III
    Even though the EGR has been disconnected for over a year, you still think that is the issue? I will give it a try to see what happens. Thanks for the info.
     
    #4 Ray Glenn, Jun 14, 2020
  5. AzusaPrius

    AzusaPrius Senior Member

    Joined:
    May 27, 2020
    1,673
    771
    0
    Location:
    California
    Vehicle:
    2010 Prius
    Model:
    IV
    Everytime the thermostat opens the temperature is 180F it will boil at 212F

    Posted via the PriusChat mobile app.
     
    #5 AzusaPrius, Jun 14, 2020
  6. sam spade 2

    sam spade 2 Senior Member

    Joined:
    Mar 31, 2018
    7,035
    2,782
    0
    Location:
    USA
    Vehicle:
    2017 Prius c
    Model:
    Four
    If it works like most cars........
    A 180 thermostat starts to open a bit before 180.......
    AND a pressurized system with the proper coolant in it won't boil until about 230.

    But that information does nothing to help him solve his problem.
     
    #6 sam spade 2, Jun 14, 2020
    Ray Glenn and tvpierce like this.
  7. fuzzy1

    fuzzy1 Senior Member

    Joined:
    Feb 26, 2009
    17,113
    10,043
    90
    Location:
    Western Washington
    Vehicle:
    Other Hybrid
    Model:
    N/A
    That boiling temperature is for unpressurized water. Cars should have an antifreeze mixture that boils at a higher temperature. Then add in the pressurization ...
    Were you running up the same hills back then and ever since?

    (I just finished my EGR cleaning, intake manifold section, yesterday. EGR pipe and cooler done over the winter.)
     
    #7 fuzzy1, Jun 15, 2020
    ttou68 likes this.
  8. Ray Glenn

    Ray Glenn Junior Member

    Joined:
    Jun 14, 2020
    3
    1
    0
    Location:
    Alabama
    Vehicle:
    2012 Prius
    Model:
    III
    I have been driving this same route (between home and church) at least twice a week for years.
     
    #8 Ray Glenn, Jun 15, 2020
(You must log in or sign up to post here.)