Luke warm air heater not working properly - 1996 Saturn SL

-Sounds like the system is clogged or the on off valve is not open
properly.
-Check the valve and flush the system. It should be good to go.

Good luck

Mai

heater blows cold air idle chrysler 300 Questions & Answers ...

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Find solutions to your heater blows cold air idle chrysler 300 question. ... blow warmair for a few mins then back to luke warm. i replaced thermostat ... HEAT BLOWSCOLD AIR WHEN IDLING ONLY GETS HOT WHEN START DRIVING ... About 15 minutes after driving the diver side vents start blowing straight cold air but the ...

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Why is My Car AC Blowing Hot Air? - BlueDevil Products

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There could be more than 1 thing wrong, I assume the fan works because the A/C blows cold, as for the heater is it blowing luke warm or nothing at all. If the thermostat was removed and left out you would have luke warm air because the water that circulates through the heater is not getting hot if this is the case replace the thermostat with the correct one, another issue would be the heating element under your dash has no power to it or the element has deterioated.

may have air trapped in it still or thermostat is not working properly..

Check for head gasket replacement. Headgasket may be bad.

Heater core may need to be replaced.

Yes it can, leaks , low level coolant, stuck thermostat can cause this issue

never heard of LUCK warm?? but if its luke warm change the thermostat and flush out the radiator for proper coolant flow with no restrictions fill back up with 50/50 coolant

Look for a heater control valve under the hood connected to one of the heater hoses and make sure the valve is operating properly. This is what allows the hot water to pass through your heater core. Also your heater core may have a blockage.

there should be an electric water pump exclusively for the heater. on these 201 body cars it should be under the hood, on the passenger side,near the fender well. when the heater is engadged, this pymp should turn on pushing the hot water into the heater core. if these are not working, it will obstruct the water flow.

You may need to replace your thermostat. Also while you are at it flush and fill your cooling system.