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98 mitsubishi eclipse overheating

I have a 98 eclipse & havent had any prior problems with overheating til today. I started it this am & ran down to store about 3mins away left running why ran in to mini mart got in it and left & was driving when i notice that heater was blowing cold air and i looked at my temp guage&it was buried past the H which it is rainy & cold at moment where i live so shouldnt be running hot for any weather reason. but i immediately pull over and try reving my rpms to about 3 or 3.5 & keeping there in hopes temp guauge will start going down but it didnt so is my thermostat stuck open or what could be the problem & do u have any suggestions to try for a simple quick fix for the moment

Posted by Anonymous on

6 Suggested Answers

6ya6ya
  • 2 Answers

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Posted on Jan 02, 2017

motor1258
  • 6674 Answers

SOURCE: 2002 caravan, heater problems

That was a common complaint a few years back, due to the fact that the heater core is a little too much higher than the engine, which requires that extra push it gets when engine RPM's increase. One thing I did do on my Caravan was remove my hoses to the heater core, and use a small external pump with hoses to circulate C.L.R. through my core for a while, then let it sit with CLR in the core overnight.Next day I circulated it through again, both ways by reversing hoses, and then re-attached hoses, bled air out of system, and notice quite an improvement in heat at idle. Once cleaned out, the heater core allowed coolant flow through it better at idle. If your stumped by explanation, take it to an automotive shop, or a Rad shop, and get a quote on flushing that core out for you. I recommend the CLR, but it might be too time consuming for you , but a flush will probably show some noticeable improvement.

Posted on Nov 23, 2008

  • 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

wyatt1582
  • 453 Answers

SOURCE: 98 Expedition 4.6L Overheating, Blows Cold Air

Sounds like the fan and temp gauge (located on the intake mainfold is screwing up) , if its head gaskets it would be smoking out the tail pipe. Have you added any antifreeze if so was it once a week if so make sure nothings leaking on the ground if there isn't then its your head gaskets that would be a first for a 4.6 which is a good motor and none I would on ever had bad heads. I would check the water pump fan first with truck off grap fan at 9 and 3 and see if it wobbels forward and backward if so it's the fan. I have come across alot of bad fans. Fan would cost $30 and up. Rate of difficulty 1-10 I give it a 4.

Posted on Mar 21, 2009

  • 651 Answers

SOURCE: 2002 KIA Sedona Overheating

most likely, replace thermostat .

Posted on Apr 14, 2009

SOURCE: Mitsubishi Eclipse Ac and heater problem

cold air on passenger side of car and warm on drivers, why

Posted on Oct 14, 2009

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Perhaps these will provide a bit of information prior to contacting your dealer. I've never worked in a dealership that charged for looking up & providing info on TSB's. Good luck.

If this helps to solve your problem then please take a moment to rate this post. - Thanks.

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Thank you...........

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