Question about 1997 Saturn SL

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99 saturn no heat or defrost

We replaced the thermostat it worked for a few days and stopped. The fan and ac work , the air volume drops when you turn on heat

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Sounds like your heater core is mostly stopped up. You need to have your cooling system back flushed and cleaned.

Posted on Sep 12, 2009


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My heat and air blower will not turn on it just stopped a few days ago which means my defroster doesn't work... how do I fix this?

The fan, which is the "air blower" for heat and A/C sits on its end in the heater box which is just above your front passenger's feet. It could be bad if it is not running when you turn on the fan switch. These cost about 50 bucks and are available at any parts store. Fairly easy to replace, disconnect the wiring plug, back out some screws, vacuum out the hole, reinstall in reverse order. Note some trouble shooting should be done to eliminate fuse and switch as bad guys.

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The cooling fans won't run until either the engine coolant temperature reaches about 218 degrees or the air conditioner/defroster are on. Once the engine reaches appx 218 degrees the fan will come on and run until the coolant temperature drops a few degrees and will then turn back off. If either the a/c or defrost are turned on then the cooling fan will begin to run to remove the heat from the a/c system and should stay on until either is turned off. If the engine is overheating in slow or stop and go traffic then the fan may not be working at all due to a bad fan motor or blown fuse.

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Defrost, heater fan and air won't work on my 96

just a guess but being that the rear defrost is not woking id bet ist a fuse check owners manuel or go to a local autozone or the like store as thy should check this for free hope this is helpfull.
please post response good luck

Jan 07, 2010 | 1996 Saturn SL

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98 Saturn SL AC/cooling fan will NOT work

Do not let this car over heat a blown head gasket will ensue. Locate and replace the fan relay, if that doesn't fix the problem unplug fan and use jumper wires to ground the plug then feed power to the positive side of plug to check fan, if that doesn't work replace the coolant temperature sensor located somewhere near the intake manifold or thermostat housing area.

Jul 01, 2009 | 1998 Saturn SL

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99 Dodge Durango runs hot,ac only out defrost, wheel issue

Check the thermostat, and clean or replace the idle air control valve, replace the ball joints, replace the plugs and plug wiresthis should correct the problem.

Jun 27, 2009 | 1999 Dodge Durango

1 Answer

2001 Saturn SC1 Overheats when AC is turned on

Hello donezero,

Thank you for choosing

Try replacing the thermostat first. I see you mentioned that it overheats with the A/C on, while in neiborhood streets (or lower speeds). Also, with the vehicle parked, and the car running, raise the hood, and watch to see if the fans are coming on. If not, check the fuses in the fuse box. You may have a blown fuse. Examine both top and bottom radiator hoses to make sure there are no cracks, holes, or bubbles. If they look like they need replaced, replace them. Also, check the fuse and any relays that may be associated to the A/C pump - there should be one of each. By changing the thermostat, you eliminating it right away for being the reason of overheating. After diong all this, and the car still overheats under these circumstances, replace the temperature sensor, which is located on the intake manifol (usually close by the thermostat ) driver side of engine, toward front or center. (may be on passenger side, depending on engine). If this does not take care of the problem, consider a certified mechanic for further assistance.

I sincerely hope this information is helpful in getting your car (A/C) running properly. Let me know if I can be of further assistance in this matter. Thank you again for choosing


Apr 03, 2009 | 2001 Saturn SC

4 Answers

The heater still won't work after I changed the thermostat on my

Get a female garden hose adapter from the local hardware store. Disconnect the heater hose from behind the fan pulley and attach the hose connection. Disconnect the other heater hose behind the alternator, aim it towards the ground and flush water through the heater core. This worked on my truck.

Feb 12, 2009 | 1999 GMC Sonoma

1 Answer

AC/heat/defrost functions don't work

there is a blend door and a selector door in the HVAC system. These are run by vacuum or servo motors. Sounds like this little motor is your problem. Hope this helps you.

Jan 18, 2009 | 1997 Ford Thunderbird LX

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