Question about 1999 Saturn SL

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Coolant leak-my radiator fan is not working, it works witht he A/C but not alone. I have replaced the relay and coolant sensor. once the temp gauge reaches between 1/4 and half-not even half it boils and vents out the resv. What am I missing. It actually runs cooler with the A/C on.

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Do u have voltage to the relay? if not then u have a blown fuse or a bad wire

Posted on Jul 18, 2009

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2 Answers

Radiator fans not coming on. replaced thermostat and cooling sensor


Hi Bill, is the engine actually getting hot enough for the fans to come on? if the engine does have overheating problem (but you say the temp gauge reads normal) then i would check the operation of the engine temp switch, there are two, one for the gauge and one for the fans.

Oct 15, 2016 | 2006 Ford Escape

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My car heats up in stop n go traffic. The temperature gauge can go as high as to the 'RED'. I adding water and coolant everyday. Are the fans supposed to come on as I am driving and the car heats up?


if you are adding coolant every day then you are experiencing coolant loss
could be from a leaking pump gasket , head gasket or other leaking item
have a compression test done to check for head gasket , cracked head
next have the cooling system pressure tested to find the cooling leak
lastly check the fan, fan relay , fuses and coolant temp sensor unit for correct operation

Sep 30, 2016 | Cars & Trucks

1 Answer

Replaced head gaskets on pontiac trans am 1997 lt1 eng now its over heating


trapped air. When temp needle climbs to 1/4 way, loosen coolant temp sensor to bleed off trapped air in cylinder heads. Air is gone once coolant starts to stream out, but only open slightly at a time. May have to do in increments as trapped air will cause rapid overheat

Jul 03, 2015 | Pontiac Cars & Trucks

1 Answer

Radiator fans will not turn on.


replace fan switch. depending what make vehicle, it could be located
on the side of radiator, on thermostat housing, on cylinder head.

Apr 03, 2014 | Chrysler Grand Cars & Trucks

1 Answer

Sensor for radiator fan 01 mitsubishi eclipse 4 cylinder


Assuming the cooling system is full of fluid, there is a coolant temp sensor that tells the computer what the engine temp is. When the engine reaches aprox 220 degrees the computer grounds the fan relay.
If you have tested the fans and you know they work, could be the sensor or the relay, or the computer.

Sep 06, 2012 | 2001 Mitsubishi Eclipse

1 Answer

Radiator fans not working car is running hot.


Turn vehicle off. Allow to cool. Raise hood.
Try to see if the fans spin freely by hand. If not, replace. If they do spin, proceed to next step.
Next step-
Check coolant level, add if needed. Remember-radiator must be cool before opening cap. Make sure radiator cap is secure and tight if coolant was added.
Start vehicle. Observe coolant gauge as vehicle warms. Fans should come on when temp gauge reads halfway between c and h.
If fans do not come on see if they come on when you turn on ac or heat. If doing this makes them come on, suspect faulty cooling fan sensor switch. If they don't come on replace cooling fan sensor switch and fan relay.

Aug 30, 2011 | 1989 Nissan Maxima

1 Answer

1991 saturn sl1 is overheating, new thermostat installed, fan is functional, suspecting sensor? and if so, where is it?


Try this for a diagnostic:
Check coolant level. Fill if necessary. Check for leaks.
Start vehicle. Allow to run.
Observe coolant temp gauge. It should slowly climb to center.
Once coolant temp gauge reaches the middle, the coolant fan is triggered to activate by the vehicle's computer (ecm). Fan should come on until temp drops slightly then cycle off.
If fan is working, move to next step. If fan isn't working, possible causes:blown fuse, faulty fan relay, coolant fan switch, faulty cooling fan.
Next step.
If there are no leaks, and the fan works properly as described above, have a compression test performed. This test will basically measure the compression power (in PSI) in each cylinder by screwing a device into the spark plug hole of each cylinder cranking the vehicle (with ignition disabled) and observing the gauge. Each cylinder reading should be significantly close to its next one. If not, suspect a faulty cylinder head gasket.

Aug 28, 2011 | 1991 Saturn SL1

2 Answers

Coolant leaking replace every three days coolant fan wont stop ru


This link has a diagram showing the location of the relay: http://autorepair.about.com/library/faqs/bl581g.htm

The Pulse Width Modulated (PWM) radiator cooling fan relay is located behind the front bumper fascia below the right head lamp.

Sep 08, 2009 | 2000 Jeep Grand Cherokee

1 Answer

Temp gauge goes high. Radiator leak just the


It could well be a faulty thermostat- test or replace same.
Could also be a blocked radiator core, - check coolant or airflow is not restricted,
Ensure any radiator leaks are repaired,
Ensure coolant level is correct, without airlocks - bleed as necessary on re-fill,
Check operation of cooling fan - ensure fan runs at appropriate engine temperature - if not check sensor switch and associated relay operation.
Thermostat is located at the end of top radiator hose where it connects to engine housing.

Aug 10, 2009 | 1995 Jeep Grand Cherokee

1 Answer

2000 Ford focus se wagon overheat


you may have a stuck thermostat,if all fans are working then just flush out radiator and replace
thermostat.check for any coolant leaks and check coolant level after few days

Jun 14, 2009 | 2000 Ford Focus

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