Blinking Temp & Coolant lights. 99 SL1

Discussion in 'Saturn S-series' started by reex01, Jan 23, 2005.

  1. reex01

    reex01 Guest

    The Temperture and Low coolant lights blink simaltaniously on my 1991 SL1
    until the engine gets to normal operating temperture. Then they usually go
    off, but sometimes they will start blinking again. The coolant level is
    full (I just flushed the system and refilled to be sure that wasn't the
    problem. All other fluids are at the full level. The car is not
    overheating (the temp. gauge never goes much past the first mark). Any
    idea what is causing these lights to blink? Nothing said about it in the
    owners manuel.
    reex01, Jan 23, 2005
  2. I recently flushed and filled my coolant system and had the same issue.
    Bubbles, I suppose, in the system took on more coolant as the bubbles left
    the system. I just topped it off when I noticed my FULL-Cold line wasn't
    quite full. Nary a problem since.

    Otherwise, it might be a sensor issue. Check the obvious first (levels) and
    proceed from there. Good luck.

    '94 SL2 167000 miles.
    Barry Schnoor, Jan 24, 2005
  3. I have a 99 SC2 that started doing this recently as well. I had plenty of
    coolant in the system and in the reservoir (although I would hear some
    gurgling as the engine revved up from a stop; this has been the same for
    over 3 years).

    I checked the tranny fluid level, and it was slightly low, so I topped that
    off. Contrary to what reex01 wrote, the function of the light IS mentioned
    in the manual, but you have to look for it under the explanations for all
    the dashboard telltales (it's not listed in the manual index). All it says
    there really is that either you are low on coolant and the engine is due to
    explode, or you are overheating the transmission due to driving conditions
    or low fluid and the tranny is due to explode (well, not really, but you get
    the picture).

    But I agree with Barry: if the fluids are good (and this sensor is only
    supposed to pertain to coolant and tranny fluid), the next logical step is
    the sensor acting up. BTW, I got no engine service codes when I hooked up a
    scanner to the connector on the dash.

    I have the Saturn service manuals for the 99's (4 big books, covers all
    models) and will look this up further and see what it entails (I'm home
    recupperating, so I can't actually do the work, only read about it.)

    David Maucher, Mar 4, 2005
  4. My 97 SL2 w/manual trans did that and I kept topping off the tank. Then it
    started throwing-up after I shut it down and would spill some coolant into
    the driveway. Finally the dealer put a new cap on the reservoir and the
    throwing-up and the flashing light prob stopped. ...just a thought.
    Jonnie Santos, Mar 4, 2005
  5. reex01

    jdoe Guest

    I'll lay odds you have a blown head gasket or cracked head. You may not be
    seeing anything (coolant in oil or vice versa) but I can almost guarantee
    that's the issue.
    jdoe, Mar 4, 2005
  6. Larry:

    That seems a bit extreme for the condition indicated by the flashing dash
    light. There are no symptoms on my 99 SC2 which would indicate a blown head
    gasket (I'm not losing any coolant, there are no oil leaks, engine runs

    Would you have other evidence for your diagnosis of a blown head gasket for
    my car, or are your comments directed to the original poster (reex01)?

    David Maucher, Mar 5, 2005
  7. reex01

    jdoe Guest

    directed at the sympoms you mentioned. that gurgling noise you hear is air
    in the cooling system. Many times a HG will go or a head will be cracked and
    there will only be some strange indicatior behavior and or the noise you
    mentioned. What happens is exhaust gasses find there way into the cooling
    system. The can be checked by using a device that "sniffs" for combustion
    gasses in the cooling system. I would advise you to not ignore it and have
    this checked.
    jdoe, Mar 5, 2005
  8. Okay, yeah, I can agree with that, idea, but as I mentioned it's been this
    way since I got the car in 2001. I'll bring it to a shop that has something
    that can pick up on exhaust gasses in the coolant reservoir. I guess it
    would be similar in function to the one I have that finds R-12 refrigerant

    David Maucher, Mar 5, 2005
  9. reex01

    jdoe Guest

    It's device filled with liquid that sits on top and seals the coolant tank.
    If combustion gas is present than the liquid changes color.
    jdoe, Mar 6, 2005
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