Blinking Temp & Coolant lights. 99 SL1

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.

Reply to
reex01
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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.

Barry '94 SL2 167000 miles.

Reply to
Barry Schnoor

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.)

Dave

Reply to
David Maucher

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.

Reply to
Jonnie Santos

Reply to
jdoe

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 evenly).

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)?

Dave

Reply to
David Maucher

Reply to
jdoe

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 leaks?

Dave

Reply to
David Maucher

Reply to
jdoe

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