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

8,015

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

8,015

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

8,015

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?

8,015

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

Your Answer:

Lumina

Looking for a Used Lumina in your area?

CarGurus has 93 nationwide Lumina listings and the tools to find you a great deal.

ZIP:

Chevrolet Lumina Experts

  • #1
    90V6RedHotLuminaEuro
    Reputation
    1,290
  • #2
    John Saffrahn
    Reputation
    1,140
  • #3
    11jonny11
    Reputation
    1,030
View All

Related Models For Sale

Used Chevrolet Impala
535 Great Deals out of 23,307 listings starting at $500
Used Chevrolet Malibu
662 Great Deals out of 57,602 listings starting at $1,750
Used Chevrolet Monte Carlo
11 Great Deals out of 902 listings starting at $1,595
Used Chevrolet Camaro
479 Great Deals out of 27,079 listings starting at $1,400
Used Pontiac Grand Prix
1,606 listings starting at $1,900
Used Ford Mustang
484 Great Deals out of 38,393 listings starting at $1,100
Used Chevrolet Silverado 1500
1,792 Great Deals out of 162,522 listings starting at $2,195
Used Chevrolet Tahoe
632 Great Deals out of 38,296 listings starting at $1,025
Used Buick Regal
69 Great Deals out of 3,159 listings starting at $3,200
Used Nissan Maxima
370 Great Deals out of 17,720 listings starting at $995
Used Ford F-150
2,557 Great Deals out of 186,515 listings starting at $650

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.