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

61,445

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?

148,885

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.
47,415

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 5,789 nationwide Lancer listings starting at $2,999.

ZIP:

Search Mitsubishi Lancer Questions

Mitsubishi Lancer Experts

#1 FordNut
FordNut
Reputation 270
#2 Daniel Foster
Daniel Foster
Reputation 170
#3 T_S_T
T_S_T
Reputation 160
View All

Related Models For Sale

Used Mitsubishi Lancer Evolution
24 Great Deals out of 632 listings starting at $14,995
Used Honda Civic
668 Great Deals out of 77,418 listings starting at $1,000
Used Subaru Impreza WRX
38 Great Deals out of 1,139 listings starting at $1,500
Used Ford Mustang
361 Great Deals out of 44,495 listings starting at $1,000
Used Honda Accord
812 Great Deals out of 81,611 listings starting at $899
Used Mazda MAZDA3
234 Great Deals out of 28,930 listings starting at $895
Used Mitsubishi Lancer Sportback
3 Great Deals out of 141 listings starting at $5,981
Used Mitsubishi Eclipse
23 Great Deals out of 1,518 listings starting at $2,498
Used Subaru Impreza
176 Great Deals out of 13,341 listings starting at $1,817
Used Dodge Charger
358 Great Deals out of 29,623 listings starting at $2,475
Used Toyota Corolla
874 Great Deals out of 74,435 listings starting at $1,500
Used BMW 3 Series
1,384 Great Deals out of 37,799 listings starting at $1,500
Used Subaru Impreza WRX STi
29 Great Deals out of 584 listings starting at $9,000
Used Ford Focus
696 Great Deals out of 58,725 listings starting at $995
Used Scion tC
106 Great Deals out of 4,076 listings starting at $2,000

Used Cars For Sale

2017 Mitsubishi Lancer ES For Sale
1,631 listings starting at $12,360
2016 Mitsubishi Lancer ES For Sale
698 listings starting at $9,900
2015 Mitsubishi Lancer ES For Sale
14 Great Deals out of 522 listings starting at $7,980
2014 Mitsubishi Lancer ES For Sale
8 Great Deals out of 171 listings starting at $6,988
2013 Mitsubishi Lancer ES For Sale
98 listings starting at $6,300