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99lexusEs300 noticing in past week temp dropped out between30-40°my tempgauge been very low when warms up after driving frwy or4 15+minutes tempgauge would drop low again asif car was never started

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  • Chris Milioto Dec 21, 2016

    Turn on the heater and does get warm in Car but temp gauge does drop

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  • 20 Answers

Sounds like a bad t-stat. Is the heater output low?

Posted on Dec 21, 2016

  • 2 more comments 
  • Chris Milioto Dec 21, 2016

    Turn on the heater and does get warm in Car but temp gauge does drop

  • Chris Milioto Dec 21, 2016

    But does not get as warm as I think it should be

  • Steve Alakel Dec 21, 2016

    I'd start with a new thermostat then.

  • Chris Milioto Dec 21, 2016

    Ok thanks

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tripletauto
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SOURCE: 1994 LeBaron GTC convertible temp fluctuations!

have you checked the coolant in the radiator? if overflow jug was empty radiator is probably low as well. always check when engine is cold. if you are low in coolant it will cause the fluctuation

Posted on Sep 26, 2008

  • 1118 Answers

SOURCE: Heat blowing Cold when in drive. When in Park, it is warm

have you chg. any thing lately like thermostate? added any coolent to system? if not, thermostate could be stuck in the open position. if stuck open, setting still, it will throw heat, but moving coolent flows to fast and does not get a chance to get hot. if you did chg. thermostate it could have a air pocket in the system. and also adding coolent can create an air pockets too. you will know this when your traveling down the road and temp guage fluctuates up and down. witch means air in system.

Posted on Jan 15, 2009

  • 740 Answers

SOURCE: 2000 Elantra Overheating

First when vehicle is cold like in the morning check and make sure that the vehicle has enough coolant/ antifreeze in radiator and reservoir. If coolant is need use a 50/50 mixture of water and antifreeze. You will need some time to do this let car run at idle until the temp guage is in the middle NOT+ normal operating temperature. At this point if the thermostat should be in the open position. Let vehicle run and check to make sure that radiator fan comes on. This should come on when guage is about midway/half way. If temperature rises above half going to h/hot and fan doesn't come on, you either have a BAD FAN BAD FAN SWITCH BAD FAN RELAY OR BLOWN FAN SWITCH FUSE. You will need to check all of the following I will help if its needed. If fan comes on and doesn't go off and vehicle continues to get hot even with fan running. Feel radiator hoses and see if the lower radiator hose is cool/cold. If it is you have thermostat that stuck closed. Replace thermostat and fix problem. If all the above is good and vehicle continues to over heat. THE BAD NEW IS THAT YOU MAY HAVE A BLOWN HEAD GASKET /CRACKED HEAD /BROKEN WATER JACKET. Basically you will need a HEAD JOB at least a head gasket. ONe tell tail sign of this is oil looking like milkshake/chocolate milk-a creamish while residue in oil or antifreeze. Contact if you need hel0p. Good Luck and thanks for using FIX YA

Posted on Jan 17, 2009

  • 366 Answers

SOURCE: 2004 Tahoe Heater Problem

check coolant level ,must be low ,chck for coolant loss

Posted on Mar 05, 2009

  • 31 Answers

SOURCE: Overheating/No Heat 2001 Impala

change the thermostat and the temp gauge in the radiator

Posted on Mar 08, 2009

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