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

4,515

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

4,515

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

4,515

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

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?

4,515

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 1 nationwide Lumina listings and the tools to find you a great deal.

Postal Code:

Chevrolet Lumina Experts

  • #1
    90V6RedHotLuminaEuro
    Reputation
    1,210
  • #2
    John Saffrahn
    Reputation
    1,100
  • #3
    11jonny11
    Reputation
    940
View All

Related Models For Sale

Used Chevrolet Malibu
99 Great Deals out of 1,769 listings starting at $888
Used Chevrolet Impala
179 Great Deals out of 1,062 listings starting at $2,454
Used Chevrolet Corvette
522 listings starting at $7,900
Used Toyota Camry
90 Great Deals out of 2,220 listings starting at $1,900
Used Dodge Avenger
20 Great Deals out of 283 listings starting at $1,729
Used Chevrolet Camaro
927 listings starting at $12,498
Used Chevrolet Monte Carlo
16 listings starting at $4,900
Used GMC Yukon
4 Great Deals out of 850 listings starting at $4,995
Used Honda Accord
69 Great Deals out of 1,187 listings starting at $1,888
Used Buick LeSabre
9 listings starting at $3,795
Used Chevrolet Tahoe
5 Great Deals out of 776 listings starting at $4,200
Used GMC Envoy
3 Great Deals out of 28 listings starting at $3,998

Used Cars For Sale

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.