1999 Saturn SC1



February, 28, 2009 AT 6:51 AM

Engine Cooling problem
1999 Saturn SC1 4 cyl Front Wheel Drive Automatic

The car overheats when at a idle. I replaced the heater hoses, and noticed the cooling fan was worn also. I checked the fuses and noticed the A.C. And the cooling fan have the same numbered relays. I pulled the ac relay, and the A.C. Shut off. So I switched the A.C. Relay with the coolong fan relay and the fan still doesn't work.

Now before the fan would not come on unless the A.C. Was on. After replacing the fan, it won't come on at all. I even ran 12volt directly to the fan and it came on, so the new fan is at lease working.

I called the auto store search for a possible sensor that might be causing the problem, but they said there isn't any sensor for the cooling fan. Is this true? And what should I do from here?

Day2: Now also the cars wont start. Not getting spark. Also the chime and all the dash lights went out. Checked the wiring, seems good. About 4hrs later the car lights, radio, and chime all started working. Then the car started. This is def electrical. What device would link all these devices together? (Mechanical/Drivetrain control module)?

Thank you for you time and effort.

Ohio28. (This is a low income ladies car I am trying to fix free of labor, please help.)

2 Answers


will j

July, 19, 2012 AT 8:12 PM

My 99 sc1 did the same thing. It was the battery ground. I took it off, cleaned the terminal and wire and remounted the wire tightly. Fixed problem!



October, 17, 2012 AT 9:32 PM

With no chime no start etc I would try unplugging the chime module the large one on the back side of the fuse box. Inspect the terminals for corrossion and bent terminals if there are any plug the module back in.I have seen a loose chime module cause rear window defrosters inop no starts etc. As far as cooling fan goes your ac does work the ac clutch kicks in when turned on and the radiator doesnt come on?If not check the black wire to the fan motor that should have a 2 ohms or less constant ground. If not find the two bolts holding the transmission in that are side by side there are wires going to them the smaller one is the ground for the fan. Also there is a coolant temp sensor that controls the fan screwed into the head bellow where the upper radiator hose goes on the head. Also inspect the inside of the connecotor to it if the terminals are green or blue instead of silver replace the connector.

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