Recent Topics
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
Honda Accord Needs Shocks; Front, Back, or Both?
by tc1446
06/19/18 05:50 AM
How much oil does your oil filter hold?
by Snagglefoot
06/19/18 05:44 AM
better day
by mx5miata
06/19/18 05:26 AM
BRAVO to Officer Wheeles......
by Sayjac
06/19/18 05:17 AM
People Watching ....Airport style.
by ZZman
06/19/18 04:24 AM
Subaru's at play...
by OneEyeJack
06/19/18 03:50 AM
Treating a 2003 Jetta
by llmercll
06/19/18 01:41 AM
Brakes not working - brake pedal sinks
by tookien
06/19/18 12:42 AM
Dave thinks I can make it 12--15k
by Marco620
06/19/18 12:26 AM
'05 Impala front wheel "squeal". Cost !
by Lee4212
06/19/18 12:16 AM
One Dollar Per Gallon?
by Y_K
06/18/18 11:53 PM
Newest Members
JustaDude, 3horseman, Firedog45, WtsTacoma01, Orion62
65265 Registered Users
Who's Online
92 registered (2strokeNorthstar, Andy636, ArrestMeRedZ, 853okg, 2015_PSD, 9 invisible), 1609 Guests and 40 Spiders online.
Key: Admin, Global Mod, Mod
Forum Stats
65265 Members
67 Forums
285589 Topics
4765981 Posts

Max Online: 3590 @ 01/24/17 08:07 PM
Donate to BITOG
Page 1 of 2 1 2 >
Topic Options
#4582713 - 11/23/17 09:08 AM Failing Thermostat?
Delta Offline


Registered: 04/20/14
Posts: 1145
Loc: South Central PA
So recently with it getting cooler the truck is not warming up like it should or staying where it used to. This is about a 20 minute ride around town:



Normally it would be at the notch right before 210. Was that way last winter. The odd thing is I do have heat, although I don't think it is as warm as it once was. Upper radiator hose is warm, but not hot. Lower is barely warm enough to tell. Clutch fan seems to operate as normal. Could this be a sign the thermostat is going out, or something else?
_________________________
'17 VW GTI 2.0T - 6MT - 7K
'15 Camry SE - 2.5 - 19K
'99 S10 - 2.2 5MT - 153K

Top
#4582716 - 11/23/17 09:11 AM Re: Failing Thermostat? [Re: Delta]
Nick1994 Offline


Registered: 02/19/13
Posts: 10097
Loc: Phoenix, AZ
Probably a bad thermostat. My grandparent's Trailblazer did the same thing.

Do you have a code reader? Or know someone with one?

If so, plug it in and see what the computer says the temperature is, sometimes those gauges aren't that accurate.

Also, OEM thermostat or nothing. We had a Stant put into their Trailblazer and it started running hot, Stant replaced with another Stant still running hot. Then got an OEM and it was a lot better. Turned out the Stant had a smaller opening that the OEM, we used a micrometer and it was somewhere around a 10-12% smaller opening.
_________________________
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
#4582760 - 11/23/17 09:58 AM Re: Failing Thermostat? [Re: Delta]
WobblyElvis Offline


Registered: 09/23/14
Posts: 1343
Loc: Toronto Canada
Most likely the thermostat. As Nick said I would consider an OEM unit. The quality of the aftermarket parts has taken a nose dive.

Top
#4582802 - 11/23/17 10:49 AM Re: Failing Thermostat? [Re: Delta]
StevieC Offline


Registered: 08/21/08
Posts: 17116
Loc: Ontario, Canada
Thermostat. Surprised the ECU hasn't set a code for the engine not reaching operating temperature.
_________________________
'15 Dodge Journey - 90,000 KM's - SSO 5w20
'06 Hyundai Santa Fe - 535,000km - SSO 0w30 (R.I.P)

Top
#4582826 - 11/23/17 11:06 AM Re: Failing Thermostat? [Re: Delta]
Nyquist Offline


Registered: 10/24/08
Posts: 967
Loc: Iowa
Originally Posted By: Delta
So recently with it getting cooler the truck is not warming up like it should or staying where it used to. This is about a 20 minute ride around town:


Normally it would be at the notch right before 210. Was that way last winter. The odd thing is I do have heat, although I don't think it is as warm as it once was. Upper radiator hose is warm, but not hot. Lower is barely warm enough to tell. Clutch fan seems to operate as normal. Could this be a sign the thermostat is going out, or something else?


As others have said, the thermostat is probably partially stuck open. I had this on our Cobalt, and the symptoms were similar. It would only allow the engine to reach a temperature of 168F on the open road. I would swap it out before it does move again and gets stuck in a completely closed position and will not open which would cause over-heating.

As for the CEL, it will only illuminate that if the PCM cannot reach a closed loop condition. For some engines, that is as low or lower than 120F.


Edited by Nyquist (11/23/17 11:07 AM)
_________________________
2015 Chevy Traverse 3.6L (LLT) Mobil 1 5w30 w/ Fram Ultra
2017 Chevy Cruze Hatchback 1.4L (LE2) Mobil 1 5w30 w/ Wix

Top
#4582883 - 11/23/17 12:02 PM Re: Failing Thermostat? [Re: Delta]
92saturnsl2 Offline


Registered: 03/02/04
Posts: 1267
Loc: Flaherty, KY
Most modern GM vehicles will set a P0128 if the coolant temp is low, or not reaching operating temp fast enough. I believe the trigger is around 160-170F, and x number of minutes to reach it. I can easily set the code by installing a 160*F thermostat, whereas a 180F won't set it.

You should plug in a scanner and see what the actual coolant temp is. Torque app and cellphone/bluetooth adapter is an easy method. Many GM vehicles have a separate coolant temperature sensor for the gauge and ECU. If you replace the thermostat and that doesn't change the temperature reported, I would look at the coolant temperature sensor. They are cheap and usually easy to replace.
_________________________
1985 F-250HD 7.5L 4x4 135k- Maxlife 15w-40 HDEO [for sale]
04 Odyssey EX 180k PUP 5w-40
96 Maxima GLE 248k Castrol Edge 5w-50
07 Chrysler Pacifica Limited

Top
#4582939 - 11/23/17 01:09 PM Re: Failing Thermostat? [Re: Delta]
Delta Offline


Registered: 04/20/14
Posts: 1145
Loc: South Central PA
Thanks for the replies. I've had a sneaking suspicion the engine isn't getting warm enough, you'll notice the oil pressure sits higher than it used to. I'll get the parts tomorrow. Probably will get new hoses while the coolant is drained. If it isn't the issue it's preventative maintenance anyways.
_________________________
'17 VW GTI 2.0T - 6MT - 7K
'15 Camry SE - 2.5 - 19K
'99 S10 - 2.2 5MT - 153K

Top
#4583037 - 11/23/17 03:47 PM Re: Failing Thermostat? [Re: Delta]
Garak Offline


Registered: 12/05/09
Posts: 24574
Loc: Regina, Saskatchewan, Canada
I would change it out. From the vintage of your truck, it looks like you're fortunate enough to have a GM of the vintage where the temperature gauges were actually very useful at discerning stuff like this.

On second thought, that truck is a ticking time bomb with that thermostat. Bring it up here, I'll take the risk and take it off your hands. wink
_________________________
Plain, simple Garak.

2008 Infiniti G37 - Shell ROTELLA T6 Multi-Vehicle 5w-30, NAPA Gold 7356
1984 F-150 4.9L - Quaker State GB 10w-30, Wix 51515

Top
#4583043 - 11/23/17 03:57 PM Re: Failing Thermostat? [Re: Garak]
Delta Offline


Registered: 04/20/14
Posts: 1145
Loc: South Central PA
Originally Posted By: Garak
On second thought, that truck is a ticking time bomb with that thermostat. Bring it up here, I'll take the risk and take it off your hands. wink


Anything's possible for the right price wink

A 2wd 4 cylinder S10 would not do very well in Canadian winters, lol.
_________________________
'17 VW GTI 2.0T - 6MT - 7K
'15 Camry SE - 2.5 - 19K
'99 S10 - 2.2 5MT - 153K

Top
#4583059 - 11/23/17 04:23 PM Re: Failing Thermostat? [Re: Delta]
2strokeNorthstar Online   content


Registered: 07/19/17
Posts: 272
Loc: PR CA, USA
I wonder if those temp gauges work on Chevys. Most cars since the 80s-90s just show 1/2 way from about 170-220. They don't mean much.

Top
#4583076 - 11/23/17 04:48 PM Re: Failing Thermostat? [Re: Delta]
Garak Offline


Registered: 12/05/09
Posts: 24574
Loc: Regina, Saskatchewan, Canada
Originally Posted By: Delta
A 2wd 4 cylinder S10 would not do very well in Canadian winters, lol.

You'd be surprised. I throw my tractor wheel weights in the back of the F-150, and it's fine with two wheel drive. wink Some years ago, a buddy and I were going up a snow covered hill, with remarkably the same tires, two wheel drive, he had a GM and I had my Ford. He couldn't understand how I got up so easily when he was struggling with it. Over 300 lb of weight over the rear axle helped, I guess.
_________________________
Plain, simple Garak.

2008 Infiniti G37 - Shell ROTELLA T6 Multi-Vehicle 5w-30, NAPA Gold 7356
1984 F-150 4.9L - Quaker State GB 10w-30, Wix 51515

Top
#4583077 - 11/23/17 04:49 PM Re: Failing Thermostat? [Re: 2strokeNorthstar]
Garak Offline


Registered: 12/05/09
Posts: 24574
Loc: Regina, Saskatchewan, Canada
On the GMs I had experience with, they worked until around this generation of truck, at least. You could actually see when the thermostat cycled or the electric fan kicked in while sitting and idling.
_________________________
Plain, simple Garak.

2008 Infiniti G37 - Shell ROTELLA T6 Multi-Vehicle 5w-30, NAPA Gold 7356
1984 F-150 4.9L - Quaker State GB 10w-30, Wix 51515

Top
#4583095 - 11/23/17 05:12 PM Re: Failing Thermostat? [Re: Garak]
Delta Offline


Registered: 04/20/14
Posts: 1145
Loc: South Central PA
Originally Posted By: Garak
On the GMs I had experience with, they worked until around this generation of truck, at least. You could actually see when the thermostat cycled or the electric fan kicked in while sitting and idling.


Yup, especially the voltage one. During high electrical loads it will move around a bit. The temp gauge will normally move to the 210 range going up the mountain at high RPM's. Have to keep the revs up or you're in for a bad time laugh
_________________________
'17 VW GTI 2.0T - 6MT - 7K
'15 Camry SE - 2.5 - 19K
'99 S10 - 2.2 5MT - 153K

Top
#4583243 - 11/23/17 09:07 PM Re: Failing Thermostat? [Re: Delta]
Garak Offline


Registered: 12/05/09
Posts: 24574
Loc: Regina, Saskatchewan, Canada
You could see all kinds of nifty things when the cabs first got electric fans. wink
_________________________
Plain, simple Garak.

2008 Infiniti G37 - Shell ROTELLA T6 Multi-Vehicle 5w-30, NAPA Gold 7356
1984 F-150 4.9L - Quaker State GB 10w-30, Wix 51515

Top
#4583715 - 11/24/17 01:58 PM Re: Failing Thermostat? [Re: Delta]
Delta Offline


Registered: 04/20/14
Posts: 1145
Loc: South Central PA
Update:



Assuming the typical Chevy position (joking, been a good little truck!). Replaced the thermostat and hoses a couple hours ago. Did not change the temperature gauge reading, but I did notice the hoses were original (dated September 1998 shocked ) and the heat was noticeably warmer afterwards. Went and replaced the coolant temp sensor as well. It probably needed a coolant refresh anyways so it was all needed in hindsight. Don't know if its ever had a coolant change, but it drained fairly clean with only staining on the housing.

Here's a temp reading from the heat, seems nice and toasty now.

_________________________
'17 VW GTI 2.0T - 6MT - 7K
'15 Camry SE - 2.5 - 19K
'99 S10 - 2.2 5MT - 153K

Top
Page 1 of 2 1 2 >