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Old 06-11-2005, 03:25 PM   #1
Bill Z
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Default Radiator Fan doesn't blow without the AC on

My 99 L Saturn with DOHC radiator fan turns on with the AC but without tie AC on the car over heats at stop lights.

I have a scanning tool and the temp sensor seems to be telling the ECM what the temp is. I can see it going from 80 to 193 degrees over about 10 minutes of idling in the garage. The dash temp gague only goes to 1/4 and not amy more.

I disconnected the 2 wire sending unit and the temp on the ECM went to somtening like -40 degrees. I reconnected and it displayed a temp. I disconnected the one wire sending unit and the temp gauge on the dash went to zero.

Since the AC makes the fan work, the fan doesn't have a problem. Tje 30 amp fise is good. The AC relay is working. The fan relay is working.

So, what makes the fan turn on? Where do I check?
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Old 06-11-2005, 04:08 PM   #2
buyobuyo
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Default Re: Radiator Fan doesn't blow without the AC on

Sounds like it is working like it should too me. Assuming that the L-series fan operate in the same fashion as the S-series fan.
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Old 06-11-2005, 04:48 PM   #3
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Default Re: Radiator Fan doesn't blow without the AC on

What is the exact model designation?
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Old 06-11-2005, 05:05 PM   #4
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Default Re: Radiator Fan doesn't blow without the AC on

Quote:
Originally Posted by buyobuyo
Sounds like it is working like it should too me. Assuming that the L-series fan operate in the same fashion as the S-series fan.

Shouldn't the fan start up when the engine gets to around 180- or 190 degrees?

This fan doesn't start at all with the AC off. That to me is wrong.

What temp should the fan turn on with the AC off?
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Old 06-11-2005, 05:31 PM   #5
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1996 SL1
Default Re: Radiator Fan doesn't blow without the AC on

Fan probably won't run until around 220. Most thermostats' won't even open until 180+.
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Old 06-11-2005, 05:37 PM   #6
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Default Re: Radiator Fan doesn't blow without the AC on

You may have a faulty temperature sensor (two wire). You might try hooking up your scantool when the car is COLD and comparing the reading to the ambient temperature.
If by overheating you mean coolant is boiling, you might check your antifreeze concentration, and pressure cap.
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Old 06-11-2005, 09:26 PM   #7
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Default Re: Radiator Fan doesn't blow without the AC on

You have a few problems.

#1
You are in the L-series forum with an S-series from what you say the year is.

#2
If you have a two wire AND a one wire temp sensor then you don't have a 1999 model year car.

So you likely have a 91 to 95 S-series car.

Replace the PCM temp sensor (the two wire one) and the connector for it if there is any corrosion in the connector terminals. Reading the temp number from a bad temp sensor will only get you the bad numbers. Compare the PCM temp sensor readings (via scan tool)to the coolant temp in the surge tank (via a thermometer). The radings should be within 5 degrees F of each other.
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