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

64,365

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

1 out of 1 people think this is 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 out of 1 people think this is helpful.
60,375

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 out of 1 people think this is helpful.

Your Answer

Add photo

Related Questions

Lancer

Looking for a Used Lancer in your area?

CarGurus has 6,063 nationwide Lancer listings starting at $2,200.

ZIP:

Search Mitsubishi Lancer Questions

Mitsubishi Lancer Experts

#1 Daniel Foster
Daniel Foster
Reputation 170
#1 T_S_T
T_S_T
Reputation 170
#3 COMETGUY61
COMETGUY61
Reputation 130
View All

Related Models For Sale

Used Mitsubishi Lancer Evolution
17 Great Deals out of 471 listings starting at $10,950
Used Honda Civic
657 Great Deals out of 89,888 listings starting at $1,299
Used Ford Mustang
460 Great Deals out of 45,656 listings starting at $1,999
Used Subaru Impreza WRX
30 Great Deals out of 1,219 listings starting at $4,455
Used Honda Accord
831 Great Deals out of 85,685 listings starting at $988
Used Mazda MAZDA3
229 Great Deals out of 31,617 listings starting at $1,495
Used Dodge Charger
405 Great Deals out of 28,088 listings starting at $1,988
Used Mitsubishi Eclipse
27 Great Deals out of 1,355 listings starting at $1,000
Used Mitsubishi Lancer Sportback
4 Great Deals out of 100 listings starting at $4,998
Used BMW 3 Series
992 Great Deals out of 31,781 listings starting at $1,000
Used Toyota Corolla
775 Great Deals out of 73,014 listings starting at $1,995
Used Subaru Impreza
172 Great Deals out of 17,796 listings starting at $1,250
Used Nissan 350Z
67 Great Deals out of 1,227 listings starting at $2,595

Used Cars For Sale

2017 Mitsubishi Lancer ES For Sale
2,042 listings starting at $12,499
2016 Mitsubishi Lancer ES For Sale
13 Great Deals out of 707 listings starting at $9,951
2015 Mitsubishi Lancer ES For Sale
5 Great Deals out of 362 listings starting at $8,490
2014 Mitsubishi Lancer ES For Sale
3 Great Deals out of 130 listings starting at $6,222
2013 Mitsubishi Lancer ES For Sale
81 listings starting at $5,300

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.