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97 saturn SL engine does not reach operating temp, and no heat from heater core even before the temp problem occured

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  • 32 Answers

Replace the thermostat.

Posted on Dec 26, 2013

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Posted on Jan 02, 2017

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stormbrewin
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SOURCE: 1989 maxima no heat in vehicle

Put your hand on the heater hoses as close to the fire wall as possible find out if both hoses are hot.Do this when the vehicle is cold allow car to heat up with heater open and running.If both equaly hot then heater core at fault.If different check water supply to cold hose.

Posted on Oct 13, 2008

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2 Answers

Thermostat, put a new one in and have heat, go 15 miles up the road and it cools off. shut car off for 10 min. and it is hot again but windows are fogging up..


Does the engine reach normal operating temp? Do you live in an extremely cold region? Are the heater hoses hot? Also, there could be a problem with temp door, under the dash.

Nov 28, 2015 | 2002 Saturn Sl

1 Answer

The heat/defrost won't work


This can be caused by a stuck blend door or a clogged heater core. Can you hear the blend door moving when you turn the temp knob? If not, it may have disconnected from the control panel or blend door. If the door works, remove the heater core and flush it or replace it.

Sep 02, 2017 | 1999 Saturn SL

1 Answer

1996 Saturn SL, Heater fan runs fine but no heat. Starts with a tad of heat then blows cold. Any ideas?


The plenum may be cracked, check for air blowing out where it should not, or the blender door is not opening, a cable sheath may have popped loose, or the heater core itself is clogged with leaf debris blocking air flow..

Jan 11, 2012 | 1996 Saturn SL

2 Answers

I have a 96 sl saturn. takes half an hour for my car to reach running temp. When i start driving the engine cools down so far, to the point i have no hot air for my heater. I replaced the thermastat, i...


replace the thermostant again this time get a hotter temp thermostant and buy it from the dealer, the other thing is that these cars are known for the temp sensors being bad this would give you the false reading on the gauge but would not affect the heat, if its taaking a long time then i would replace the stant and this time or before replacing the stant i want you to flush out the heater core, remove the hoses from the heatercore and use a water hose to flush water through the heater core, a plugged core will not throw heat or will start to allow water to flow when it gets good and hot to flow through the retricted core due to rust and crud, try the flush first and then try a new temp sensor if the flush helps the heat, hope this is helpful good luck.

Jan 07, 2011 | 1993 Saturn SL2

1 Answer

Saturn 2002 sl - heat suddenly not working. Friend put in a temp sensor and flushed radiator/ new coolant. Next step ? Any ideas most welcome


replace flow control valve. theres a switch that allows the fluid to flow into the heater core this is what im saying is the fault. try that my next suggestion would be to replace the heater core.

Oct 21, 2009 | 2002 Saturn L-Series

1 Answer

Heater not working


I would check if your vent to the outside is open. If it is I would check the vacum hose that controls the vent to open and close.

Jan 27, 2009 | 2001 Saturn SL

1 Answer

No heat


Sounds like you have a clogged heater core. Sometimes heater cores can be flushed, but more times than not, it has to be replaced. If you've replaced the thermostat and your lower radiator hose is always cold, chances are it is the heater core. Hope this helps! Have a great day!

Nov 23, 2008 | 1999 Saturn SL

2 Answers

No heat


hello I have a 97 saturn with no heat. I' ve replaced the thermostat and flushed system twice help

Nov 21, 2008 | 1997 Saturn SL

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