Question about 1999 Saturn SL

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No heat not getting any heat in changed the thermostat filled back up with atifreeze gauge reading correct operating temp bottom radiator hose feels cold

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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!

Posted on Nov 23, 2008

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Posted on Jan 02, 2017

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I have change the sensor and gauge and still my car temp. gauge moves to the hot zone right away. what elese can it be. I even check the relay is good.


Try disconnecting the sensor. then turn on the ignition switch and see what the guage dose. If it still goes to the top, chances are there is a short in the wiring. If it does nothing, chances are you have a defective sensor.

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Temperature gauge cold then back to normal


You have to make sure the thermostat is working properly and is the correct one. Idle the vehicle for about 20 minutes and then feel the upper radiator hose. It should be hot to the touch. Drive the vehicle and when the temp gauge falls to 'cold' stop and feel it again. If it is much cooler to the touch than before the thermostat is defective or wrong.

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No heat. has a new thermostat. engine stays cold .


need to check to see if radiator is circulation the water . hose good make sure their no soft an sucking shut especaily the bottom hose . you can get a temp gauge take radiator cap off ,let warm up til thermostat opens put gauge in radiator see what temp. is . (wife got meat or candy temp gauge this will work) last it could be heater core bad.

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1991 daihatsu applause super selection eng-HD-E1 1589cc manual over heating- have checked thermostat water pump not that old radiator ok top radiator hose hot bottom hose cold. does this model require...


let the car get up to operating temp and squeez the top radiator hose, if you feel the coolant squeeze out into the motor you thermostat is fine, but if you feel the hose and it feels presurized you need a thermostat. Also check to make sure the fan is operating at operating temp because that would cause overheating. ALL vehicles require the cooling system to be bled. Some have a bleeder screw (usually near the thermostat ) if not fill the radiator and keep toping it off at the coolant tank.

Apr 28, 2010 | 1991 Daihatsu Charade

1 Answer

Heat blows cold, where is the thermostat to change it


Follow the lower radiator hose, it ends at the thermostat when you are done, be sure to bleed the air out of the cooling system. Fill it up and open the bleeder valve at the thermostat housing (12mm) fill the radiator until coolant comes out of it, then tighten it and fill the radiator up. Does the engine temp read cold also? The heater valve is located down low on the firewall with a heater hose going to it, be sure its operating with your temp cable.

Dec 14, 2009 | 1991 Honda Accord

1 Answer

No heat ..help installed new heater switch, replaced water pump..replaced coolants, and thermostat......................what else could it be? Nissan 2003 GXE Sentra 1.8 L Engine/...


you could have an air pocket in the cooling system that has to be burped. With a cold engine, park uphill and leave the radiator cap loose. Fill radiator and coolant reservoir. Start engine with cap loose and run at 1500 rpm until temp gauge reads normal. Feel if top radiator return hose from engine to radiator is hot. If yes, coolant is flowing and thermostat is open. If cold, thermostat is not staying closed until engine is hot.

report results.

Oct 29, 2009 | 2002 Nissan Altima

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

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