Why does engine temperature drop to almost cold when I go down hill?

Asked by Dec 10, 2015 at 12:49 PM about the 2006 Mitsubishi Lancer ES

Question type: Maintenance & Repair

My car was overheating, and thank God I caught that and made it to the mechanic. He switched the thermostat, but the radiator still wasn't heating up. He tried putting a hole in the t-stat, didn't help.(Could it have?) it turns out the water pump was totally dead (the "teeth" fell out!), and he switched it out. Now the engine takes a good while to warm up, and if I go down hill... the engine actually cools down.. to 1/8 the gauge, instead of staying right in the middle. Did the mechanic ruin the t-stat? Is it stuck in open? The only way to prove this to him is to have him drive up a big hill with me... the temp gauge stays in the middle when its idling by the time I get to the mechanic's. Any advice? Thanks!

4 Answers

67,465

It will be the hole he drilled in thermostat,put you a new one in it.

1 of 1 people found this helpful.

Is it really bad for the engine to run cold like that sometimes? How long can I drive with it like this? I've heard of people expanding the hole on t-stats a bit... why do this?

Because they hear things they don't understand, and drill holes in parts that are engineered a certain way for a reason. Yes, a cold running engine is very bad. It is designed to run at a relatively high temperature and cooled by the circulation of coolant by water pump. It is NOT wise to mess around modifying a thermostat. The manufacturers know what they are doing, and 'why' ? Because they think they know more than the designers and engineers

1 of 1 people found this helpful.
74,085

The engine will not run as efficiently as it should if it is cold all the time and you won't have heat inside the car.

1 of 1 people found this helpful.

Your Answer

Add photo

Related Questions

Lancer

Looking for a Used Lancer in your area?

CarGurus has 5,668 nationwide Lancer listings starting at $1,495.

ZIP:

Search Mitsubishi Lancer Questions

Mitsubishi Lancer Experts

#1 Daniel Foster
Daniel Foster
Reputation 180
#2 T_S_T
T_S_T
Reputation 170
#3 COMETGUY61
COMETGUY61
Reputation 150
View All

Related Models For Sale

Used Mitsubishi Lancer Evolution
22 Great Deals out of 501 listings starting at $13,826
Used Honda Civic
830 Great Deals out of 78,168 listings starting at $900
Used Subaru Impreza WRX
61 Great Deals out of 1,293 listings starting at $3,365
Used Ford Mustang
740 Great Deals out of 42,668 listings starting at $1,300
Used Mitsubishi Eclipse
26 Great Deals out of 1,255 listings starting at $1,250
Used Mazda MAZDA3
363 Great Deals out of 27,170 listings starting at $1,059
Used Subaru Impreza
202 Great Deals out of 18,295 listings starting at $1,500
Used Dodge Charger
467 Great Deals out of 27,320 listings starting at $1,650
Used Toyota Corolla
934 Great Deals out of 65,938 listings starting at $1,995
Used Honda Accord
1,002 Great Deals out of 62,552 listings starting at $999
Used BMW 3 Series
1,047 Great Deals out of 31,468 listings starting at $1,000
Used Nissan 350Z
57 Great Deals out of 1,194 listings starting at $3,917
Used Subaru Impreza WRX STi
38 Great Deals out of 657 listings starting at $9,998

Used Cars For Sale

2017 Mitsubishi Lancer ES For Sale
2,013 listings starting at $12,499
2016 Mitsubishi Lancer ES For Sale
25 Great Deals out of 496 listings starting at $7,991
2015 Mitsubishi Lancer ES For Sale
24 Great Deals out of 262 listings starting at $5,999
2014 Mitsubishi Lancer ES For Sale
4 Great Deals out of 126 listings starting at $5,980
2013 Mitsubishi Lancer ES For Sale
86 listings starting at $4,991

Content submitted by Users is not endorsed by CarGurus, does not express the opinions of CarGurus, and should not be considered reviewed, screened, or approved by CarGurus. Please refer to CarGurus Terms of Use.