Question about 2002 Mitsubishi Lancer

2 Answers

Can the engine run without thermostat - 2002 Mitsubishi Lancer

Posted by on


2 Answers

  • Level 2:

    An expert who has achieved level 2 by getting 100 points


    An expert that got 5 achievements.


    An expert whose answer got voted for 20 times.


    An expert who has written 20 answers of more than 400 characters.

  • Expert
  • 70 Answers

The thermostat controls the coolant temperature range for the engine to run correctly. The coolant temp running to hot or to cold are both bad for gas mileage, emissions and engine life. Does the coolant bubble up in the reservoir after you have driven it? If it does, then the odds are the head gasket has failed. Check the engine oil level on the dipstick to see if the oil looks milky or is over filled. If it is, then it's a head gasket that has failed and will need to be replaced. Depending on the age and mileage, it could just be the thermostat that has either stuck closed(engine coolant runs hotter than normal) or stuck open(engine coolant runs colder than normal). Hopefully it is just a bad thermostat. Good luck!

Posted on Mar 19, 2015

  • khodges3 Mar 19, 2015

    The thermostat regulates the coolant temperature for the engine to operate correctly. If the coolant temp is too hot or too cold, both are bad for gas mileage, emissions and engine life. Why do you want to remove the thermostat? Does the coolant temp overheat or never reach normal operating temp? If so it could just be a failed/stuck thermostat and would need to be replaced. Does the coolant bubble up in the reservoir after the engine has reached normal operating temp? Check the engine oil on the dipstick, does it look milky or overfilled? If so, the head gasket has failed and needs to be replaced. Good luck!


  • Level 2:

    An expert who has achieved level 2 by getting 100 points


    An expert that got 10 achievements.


    An expert that got 5 achievements.


    An expert that has over 500 points.

  • Mitsubishi Expert
  • 407 Answers

Yes, but it's not recommended. If you have cooling issue, fix the cause, usually a blocked radiator. May be collapsed hose. Colling issues can also come from a blown head gasket.

Posted on Mar 17, 2015


1 Suggested Answer

  • 2 Answers


Hi there,
Save hours of searching online or wasting money on unnecessary repairs by talking to a 6YA Expert who can help you resolve this issue over the phone in a minute or two.

Best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.

Here's a link to this great service

Good luck!

Posted on Jan 02, 2017

Add Your Answer

Uploading: 0%


Complete. Click "Add" to insert your video. Add



Related Questions:

1 Answer

What's your question?can you run a 2.5 v6 sonata with out a thermostat

Yes, you can. You can run any vehicle without a thermostat as a short-term measure only.

Removal of the thermostat means that the engine coolant circulates through the radiator and cylinders nearest to the radiator ... those cylinders furthest away from the radiator will consequently run hotter..

Running a car without a thermostat is a short term, get you home measure. Manufacturers fit a thermostat for a good reason. Running a car without one for a prolonged period is going to cause problems

Dec 22, 2015 | Cars & Trucks

1 Answer

Does the 1993 nissan sentra need its thermostat

Running an engine without a thermostat will allow it to run too cold. This will cause oil problems and fuel efficiency problems. The computer will make adjustments for a cold engine which will affect idle speed, timing, and pollution controls. You may have a plugged radiator or a water pump not moving enough water or a bad thermostat. The cost of a thermostat is much less than the damage you will cause running without one. If the radiator is plugged. running without a thermostat will not solve the over heating condition.

Aug 26, 2014 | Nissan Sentra Cars & Trucks

2 Answers

Code p0128, my check engine light came on a few days ago so I checked for the fault code, a P0128 code shows up in the dash, Recently my engine was totally rebuilt and the thermostat was left out due to...

Yes. Without the thermostat your engine cannot run in a closed loop, if it happens not to be very hot at the time you run your car, or you run it in the shade, then the engine does not have enough time to heat all of the water in your cooling system.

With a thermostat it only needs to heat a small closed loop to begin with, once this is up to temperature it will allow further fluid through from the rest of your engine.

While running your engine like this occasionally is not going to destroy it (it won't be much different to running it in, say, a particulary cold country with a thermostat), It will prevent the engine from attaining its prime temperature range quickly. I would never advise taking the thermostat out, when the coolant is sufficient warm it will run in an open anyhow, so having no thermostat will not increase cooling capacity.

Nov 04, 2013 | Chrysler Concorde Cars & Trucks

1 Answer

I live in Jamaica (no winter) can I remove the thermostat on my jeep liberty, 2005

Yeah it can safely run without a thermostat, but it will probably have a check engine light on later for code P018--engine temp too cold for too long. The engine will perform better with the thermostat and will get better fuel economy with the thermostat in place.

Jan 30, 2013 | 2005 Jeep Liberty

1 Answer

Can my 2002 trailblazer bak ran without a thermastat

Yes, most all motors can run without a thermostat. They are in the coolant line for the reason of making sure that the water in the engine gets warm enough before cooler water starts circulating thru the engine (an automatic valve ). Most engines are designed to run at a certain temperature and without a thermostat it will just take a while longer for the engine to heat up. Due to the water already circulating upon engine startup.

From my understanding, thermostats were originally installed due to performance issues with motors in cold weather. Obviously, hot weather wouldn't be an issue. If you do take it out and you live somewhere prone to cold temperatures. I would recommend spending the 15 bucks and putting one in by winter, or you might have poor performance of your engine when you first drive it. Good Luck!!

Jun 08, 2012 | Cars & Trucks

4 Answers

Changing a thermostat on 1998 chevy c-1500,can I just remove the old one and reattach the hose.the truck temperature is only 160.

No you can not

You need the correct thermostat in there

We are not living in the 1960's

Vehicles have to be keep as they
were designed & built, when new

Jun 25, 2011 | 1998 Chevrolet C1500

2 Answers

Can i take my thermostat out without harming the engine

yes, as long as the car is not running, it will be fine to take the thermostat out. just remember which way the thermostat came out so you will put the new one in properly, otherwise it can make your engine overheat.

Aug 08, 2010 | 1999 Chevrolet Silverado 1500

1 Answer

What causes oil to get in antifreeze

Driving the truck without a thermostat won't necessarily hurt the engine. It will take longer to get heat and it will be sporadic because the coolant is always circulating. Oil in antifreeze could come from 2 places, transmission cooler in rad if you have an automatic. The lines inside will occasionally start leaking. The other is from the engine, usually a head gasket leaking. My suspicion is that you have a leaking head gasket. This would explain the over heating with oil in the coolant. Take it in and get a pressure test on the rad or a compression test on the engine. This should confirm or eliminate the head gasket. Hope this helps.

Jan 31, 2010 | 1988 Mazda B2200

2 Answers

Can i drive my acura legend without my thermostat

You can drive the vehicle without the thermostat but in cooler weather you will have problems. The computer wants to see 195 degrees or more to allow the engine to run at peak performance. Without a thermostat you will be running cooler and the computer will overfuel the engine because it thinks it is cold. You could have some trans shifting and torque converter clutch problems also.

Oct 06, 2009 | 1991 Acura Legend

Not finding what you are looking for?
2002 Mitsubishi Lancer Logo

77 people viewed this question

Ask a Question

Usually answered in minutes!

Top Mitsubishi Experts


Level 3 Expert

85160 Answers

Colin Stickland
Colin Stickland

Level 3 Expert

22484 Answers

Jonah Oneal

Level 3 Expert

14092 Answers

Are you a Mitsubishi Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides