Recent Topics
'98 Mercedes E300TD Rotella T5 10W-30 5k miles
by KenO
06/19/18 04:35 PM
Premium guard oil filters
by Jaha24k
06/19/18 04:09 PM
76 super motor oil- synthetic blend 5w-30
by Jaha24k
06/19/18 04:07 PM
Who makes the Mopar 5038041AA filter?
by Quattro Pete
06/19/18 03:55 PM
Ruger Mini-14, yay or nay?
by 28oz
06/19/18 03:51 PM
USPS long long delivery to BlackStone Labs
by Pajero
06/19/18 02:58 PM
House A.c. vent leaking water
by motor_oil_madman
06/19/18 02:55 PM
"synthetic" gear oil and LS additive?
by nthach
06/19/18 01:54 PM
Supertech wix ST8 5514 miles
by jakewells
06/19/18 01:38 PM
Review - Sonax Spray and Seal.
by PimTac
06/19/18 01:36 PM
Lets Get a True Group 4 Sticky going!
by KMJ1992
06/19/18 12:17 PM
Rotella 10W40
by jakewells
06/19/18 10:43 AM
Extend WiFi Range at the Laptop?
by clarkflower
06/19/18 10:40 AM
Silicone containing waxes
by mjoekingz28
06/19/18 09:44 AM
Matrix totaled
by circuitsmith
06/19/18 08:32 AM
Door rust problems
by Dave Sherman
06/19/18 07:51 AM
2016 Honda Civic problems
by dbias
06/19/18 07:39 AM
Royal purple 75-140 in a subaru rear
by 91camarosRS
06/19/18 07:32 AM
OCI. With short trips. Nissan 4 liter
by Gawardawg
06/19/18 06:52 AM
Approach Watching on the Beach @ St Maarten ...
by LoneRanger
06/19/18 06:41 AM
Newest Members
JustaDude, 3horseman, Firedog45, WtsTacoma01, Orion62
65265 Registered Users
Who's Online
86 registered (1998CamryCE, 2oldtommy, 46Harry, 28oz, 330indy, 9 invisible), 1670 Guests and 32 Spiders online.
Key: Admin, Global Mod, Mod
Forum Stats
65265 Members
67 Forums
285605 Topics
4766343 Posts

Max Online: 3590 @ 01/24/17 08:07 PM
Donate to BITOG
Page 1 of 2 1 2 >
Topic Options
#4520815 - 09/19/17 11:58 PM Engine Running Too Cool ?
Merkava_4 Offline


Registered: 01/30/07
Posts: 17501
Loc: Clovis, CA
2000 Buick LeSabre

When I got back to the car from the grocery store, I decided to take the car for a little test trip and watch the water temperature. A/C was off for the whole trip. At the start of the trip, water temperature was 167F and ambient temperature was 70F. Took the car on the freeway for 21.5 miles. As soon as I got on the freeway, the engine starts cooling off. Stayed between 155F and 156F for the whole trip. Exited the freeway and drove about two blocks to the house.

During the time the car was sitting in the driveway at idle waiting for me to open the garage door, the temperature spiked to 182F. The same exact trip the day before with the A/C on, the engine reached a maximum temperature of 176F. Thermostat is not supposed to open until 192F.

What you guys say ?

Top
#4520816 - 09/20/17 12:00 AM Re: Engine Running Too Cool ? [Re: Merkava_4]
Chris142 Offline


Registered: 06/05/03
Posts: 16817
Loc: Deplorable in apple valley, ca
Thermostat stuck open
_________________________
02 Wrangler durablend 10w40
87 F250 traveler 15w40
04 Tahoe super-s 10w30
Z400 castrol T 10w40
Can am maveric edge 5w40
57 case tractor 15w40

Top
#4520819 - 09/20/17 12:02 AM Re: Engine Running Too Cool ? [Re: Merkava_4]
3800Series Offline


Registered: 08/02/14
Posts: 1452
Loc: Gulf Coast, MS
Same exact thing with my Regal. Car hit a equilibrium on the highway and once you got off the balance shifted.

Top
#4520821 - 09/20/17 12:06 AM Re: Engine Running Too Cool ? [Re: Chris142]
zeng Offline


Registered: 09/01/15
Posts: 2187
Loc: Malaysia
Originally Posted By: Chris142
Thermostat stuck open

+1

Top
#4520824 - 09/20/17 12:18 AM Re: Engine Running Too Cool ? [Re: Merkava_4]
Nick1994 Offline


Registered: 02/19/13
Posts: 10097
Loc: Phoenix, AZ
OEM thermostat replacement only Merk. My grandparent's Trailblazer had the thermostat replaced and it ran warmer, turns out the Stant opening was a lot smaller than the OEM one.
_________________________
2015 Hyundai Sonata 2.4L 79k PU 5w30 & OEM
2000 Toyota Camry 2.2L 228k M1 AFE 0w30 & Wix
1996 Jeep Cherokee 4.0L 146k M1 HM 10w40 & Fram Ultra

Top
#4520830 - 09/20/17 12:24 AM Re: Engine Running Too Cool ? [Re: zeng]
Colt45ws Offline


Registered: 08/15/06
Posts: 9637
Loc: Central Washington
Originally Posted By: zeng
Originally Posted By: Chris142
Thermostat stuck open

+1

Ive replaced probably half a dozen thermos in just mine and a couple of friends cars for this same behavior.

Replace the stat.
_________________________
-Colton
2002 Ford Crown Vic PI 207k, Ex-Kootenai County, ID Unit #42
Down for engine swap
2003 Ford Crown Vic PI 75k
Castrol EDGE HM 5W30, Fram XG2

Top
#4520882 - 09/20/17 02:39 AM Re: Engine Running Too Cool ? [Re: Merkava_4]
Dave9 Offline


Registered: 08/28/17
Posts: 176
Loc: Cincinnati, USA
Maybe T-stat but maybe not. The way those are geared, along with the 3800 torque (if/when in good shape) they're barely loafing along at a steady (speed limit) on the highway.

Owners of others cars will not understand that my same generation with a 3800, could run at 40MPH IDLING. Bad side, shifting was anything but performance oriented, and the gearing and high torque wears down brakes faster, like a train pulling when you brake to slow down.

Up to you, you can pull the t-stat and test it in a pot of boiling water if you like, but at that point I'd throw a new one in just because it makes sense to do so while it's so accessible.

However if it were me, I'd warm it up first then drive it like I stole it to get the temperature up, blow a little carbon off the valves, and see if you get that typical temperature plummet that happens when coolant gets around the t-stat rating then suddenly cools down the engine a few degrees because it opened.

Top
#4520931 - 09/20/17 05:59 AM Re: Engine Running Too Cool ? [Re: Merkava_4]
Tman220 Offline


Registered: 09/20/16
Posts: 144
Loc: MN
No need to over-analyze, no need for a pot of boiling water. It runs too cool and its the thermostat's fault. With the correct thermostat that engine will run pretty steady 194-197F on the highway.


Edited by Tman220 (09/20/17 06:10 AM)
_________________________
2012 Regal GS Turbo PP 5w30
1994 Camaro Z28 LT1 355 CI, 430 RWHP PP 5W30

Top
#4520941 - 09/20/17 06:38 AM Re: Engine Running Too Cool ? [Re: Merkava_4]
edwardh1 Offline


Registered: 01/17/03
Posts: 2941
Loc: Coastal South Carolina
if the oem has a hole in the stat (to allow bipass water circulation), get a stat that has that too.
_________________________
These products are all new every year?? They are a revolution!!! Razor blades, mens shirts, TVs, wiper blades, gutter guards, hearing aids... according to the ads. But also all new last year

Top
#4521004 - 09/20/17 08:21 AM Re: Engine Running Too Cool ? [Re: Merkava_4]
KrisZ Online   happy


Registered: 12/23/06
Posts: 7460
Loc: Toronto, Canada
A stuck open thermostat is much harder to spot in warm climates. In Canada it's quite easy but you have to wait for the late fall/early winter to see the temp. gauge not reaching the normal position.

I also vote for a new, OEM thermostat.
_________________________
2015 Dodge Grand Caravan-21k miles.
2006 Mazda 3-155k miles

Top
#4521097 - 09/20/17 10:15 AM Re: Engine Running Too Cool ? [Re: Merkava_4]
RoGuE Offline


Registered: 02/05/08
Posts: 680
Loc: Atlanta, GA
I just had this issue on my Malibu where the temp gauge didn't move at all from cold. Replaced the thermostat and all is well. I was getting a P0128 code. Do you have access to a scan tool?
_________________________
2007 Chevrolet Malibu
2.2L Ecotec

Top
#4521391 - 09/20/17 02:44 PM Re: Engine Running Too Cool ? [Re: Merkava_4]
SHOZ Offline


Registered: 06/28/03
Posts: 5744
Loc: Illinois
I changed t-stats on both my Hyundais this summer. Both OE and both were 'lazy'. they would run about 180-183F n the highway. But in the winter when coasting and slowing down the temp would dip below the 180F marks. Since changing them the run 185F-190F.
_________________________
2008 Hyundai Accent 1.6L 5 sp manual hatchback
2010 Hyundai Genesis Coupe Track 2L Turbo 6sp manual

Top
#4521473 - 09/20/17 04:59 PM Re: Engine Running Too Cool ? [Re: Merkava_4]
JMJNet Offline


Registered: 09/06/07
Posts: 933
Loc: TX, USA
Since it is a Buick, get ACDelco T-stat only not aftermarket.
_________________________
  • 2017 Toyota Sienna
  • 1995 GMC Suburban 6.5L Turbo Diesel



Top
#4521833 - 09/21/17 02:35 AM Re: Engine Running Too Cool ? [Re: JMJNet]
Merkava_4 Offline


Registered: 01/30/07
Posts: 17501
Loc: Clovis, CA
I've already had the new ACDelco thermostat sitting in the box for about 12 years. I even have a couple of extra seals that go around the "saturn" perimeter. What I don't have is the thermostat housing gasket. I got two on special order. Nobody stocks them anymore. Thanks for the replies guys. smile

Top
#4521880 - 09/21/17 06:15 AM Re: Engine Running Too Cool ? [Re: Merkava_4]
mk378 Offline


Registered: 09/27/15
Posts: 1414
Loc: USA
Thermostats with a rubber seal that wraps around the edge of the flange don't need any other gasket.

Top
Page 1 of 2 1 2 >