Car runs hot

Asked by Dec 11, 2017 at 09:23 PM about the 1999 Chevrolet Lumina

Question type: Maintenance & Repair

I recently replaced the thermostat on my 99 chevy
lumina because the temp gauge would jump
randomly from hot to cold.  After replacing it for
about a day and a half the problem was fixed and
car ran at normal temp.  Now its back to running
from hot to cold however its not getting as hot as it
was prior to installing new thermostat.  What could
be causing this problem and what do you suggest i
do to fix it?

8 Answers

8,785

is the coolant low , after being topped off ? . look under the oil fill cap what do you see ? what does the exhaust look like ?

8,785

First , are the fans coming on when it gets hot ?

Well the oil looked ok just low because have oil change coming up soon. The exhaust looked normal too. Now i forgot to mention that the heater blows cool air and gets hot sometimes.

And yes the fans come on as well

8,785

intermittent heat sounds like low coolant or air pocket in the system , what did the bottom of the cap look like ? a compression test will tell you if the head gasket is blown , which is what I think has happened

1 people found this helpful.

The bottom of the cap looked normal. I'm guessing you need special equipment to do the compression test right?

Also is replacing a head gasket expensive?

8,785

more importantly is the car worth it , is it rotting out underneath ? If the head gasket is gone or going it'll show [signs] lose of gas mileage , disappearing coolant , compression tester is pretty cheap , If it's been good to you there may be one thing after another to go wrong

1 people found this helpful.

Your Answer:

Lumina

Looking for a Used Lumina in your area?

CarGurus has 86 nationwide Lumina listings and the tools to find you a great deal.

ZIP:

Chevrolet Lumina Experts

  • #1
    90V6RedHotLuminaEuro
    Reputation
    1,300
  • #2
    John Saffrahn
    Reputation
    1,150
  • #3
    11jonny11
    Reputation
    1,040
View All

Related Models For Sale

Used Chevrolet Impala
729 Great Deals out of 23,728 listings starting at $763
Used Chevrolet Monte Carlo
6 Great Deals out of 862 listings starting at $1,499
Used Chevrolet Tahoe
942 Great Deals out of 39,289 listings starting at $1,500
Used Pontiac Grand Prix
12 Great Deals out of 1,453 listings starting at $1,200
Used Chevrolet Camaro
790 Great Deals out of 29,522 listings starting at $2,499
Used Buick Century
538 listings starting at $1,700
Used Buick Regal
114 Great Deals out of 3,116 listings starting at $2,499
Used Chevrolet Cavalier
485 listings starting at $4,898
Used Chevrolet Malibu
957 Great Deals out of 53,570 listings starting at $977
Used Toyota Celica
229 listings starting at $2,499
Used Ford Crown Victoria
723 listings starting at $2,932
Used Honda Accord
1,190 Great Deals out of 87,330 listings starting at $1,200
Used Ford F-250
355 listings starting at $2,995

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. Content will be removed if CarGurus becomes aware that it violates our policies.