2002 chevy imapla runninh warmer than usual


Asked by Sep 11, 2016 at 06:13 PM about the 2002 Chevrolet Impala LS FWD

Question type: Maintenance & Repair

I have a 02 chevy impala 3.8l v6 that is
running warmer than usual. I have replaced
the temp sensor and radiator cap.  Engime
light came on and said fan relay #1. So
replaced it. Both fans work but the running
fan does seem to be kicking on when it
should. It doesnt kick on until my temp
guage reaches the line above the half way
line. Any advice?

9 Answers


Remove the top "beauty" cover and look carefully at the top of the engine behind the upper intake manifold. Do you see small pools of coolant or oil? If do, the intake gaskets have failed. How many miles are on your Impala? This could also be the beginning of a water pump failure. The impeller may be rusting away. That's what happened to my 2000 Grand Prix (same engine). Here's a picture of the old water pump. You may also have a little bit of air in the cooling system. Does the heater work? HTH. -Jim


Here's the new one. You can see the difference. -Jim


Im not seeing the pictures. But yes the heater works good. 189000 miles on the car.

1 people found this helpful.

Darn! You're the second person who has told me recently that the pictures didn't post! Sorry about that! With that amount of mileage it's safe to assume that the intake gaskets have been done. They usually failed between 90,000 & 120,000 miles. But have a peek anyhow. Since the heater is working I doubt it has air in the system. Try a good flushing out of the cooling system. If it hasn't been flushed out in the past 5 years/50,000 miles you're due. HTH. - Jim


Ill look under the beauty cover tomorrow when its light out. I have already flushed the cooling system out last wk cause that was my 1st thought was a stopped up radiator


Ok, that's good. Now, does it seem to heat up when driving at higher speeds? If so it's a coolant circulation problem (water pump, thermostat, clogged radiator/cooling system passages in the engine). Or does it heat up at slower speeds and/or while idling? If so, it's an airflow problem (blocked a/c condenser, blocked radiator , fans not working). By blocked condenser or radiator I mean air can't get through because of dust, dirt, leaves, etc. I believe you have 3 cooling fan relays. Two four pin relays for each fan individually and a five pin relay for high speed. When you unplug the coolant temperature sensor both fans should come on immediately at high speed when you start the engine. If not, something is going on with the fan circuit. With the temperature sensor unplugged the check engine light will come on as well, ignore it. HTH. -Jim


It heats up to that temp no matter if your going slow, fast, or just idling. Ill unplug the temp sensor tomorrow as well and check the fans.

1 people found this helpful.

Ok, sounds good. Keep us posted! -Jim


Will do. Thanks for the help. Ill let you know what i see tomorrow evening.

Your Answer:


Looking for a Used Impala in your area?

CarGurus has 25,945 nationwide Impala listings starting at $995.


Chevrolet Impala Experts

  • #1
  • #2
    Tom Demyan
  • #3
View All

Related Models For Sale

Used Chevrolet Malibu
604 Great Deals out of 50,816 listings starting at $600
Used Chevrolet Camaro
242 Great Deals out of 26,852 listings starting at $4,000
Used Honda Accord
682 Great Deals out of 101,646 listings starting at $999
Used Toyota Camry
858 Great Deals out of 70,625 listings starting at $1,300
Used Ford Mustang
310 Great Deals out of 39,695 listings starting at $1,312
Used Nissan Maxima
231 Great Deals out of 16,831 listings starting at $890
Used Chevrolet Silverado 1500
1,780 Great Deals out of 154,899 listings starting at $1,700
Used Nissan Altima
861 Great Deals out of 61,735 listings starting at $1,000
Used Chevrolet Tahoe
633 Great Deals out of 37,962 listings starting at $1,199

Used Cars For Sale

2018 Chevrolet Impala LS FWD For Sale
6 Great Deals out of 792 listings starting at $19,770
2017 Chevrolet Impala LS FWD For Sale
352 listings starting at $12,995
2016 Chevrolet Impala LS FWD For Sale
58 listings starting at $12,295
2015 Chevrolet Impala LS FWD For Sale
193 listings starting at $11,495
2014 Chevrolet Impala LS FWD For Sale
4 Great Deals out of 184 listings starting at $8,995

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.