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I'm replacing the thermostat in my 2005 2.2 Cobalt because i have the p0128 code. My question is, what is the temp for the stock thermostat? Also, I saw someone put an LSJ thermostat in a 2.2. What is the difference in the two?
 

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I posted this on CSS a couple months ago about thermostats....

Id like to add an update to this thread for anyone interested. There are two different styles of thermostat's available for all ecotec motors. While most part's websites will not list these two, they are GM equivalent and aftermarket upgrade tstats for our cars.

You can find gates or stant thermostats in two different flavors. OE Exact and OE Type. Both of which are 180 degree thermostats, both behave differently in terms of the amount of coolant they can flow, and the rate at which they open. If you are looking for OE cooling characteristics then you want to use the OE Exact thermostat which is an exact replica of the OEM GM replacement (Alternate/OEM Part Number(s): 12615097, 12622410, 131139, 55350941, 90537453).

The OE Type thermostat is a slightly larger thermostat with a heavier spring and upgraded weir valve. This thermostat will open to full faster, and close faster as the car cools down, thus maintaining a lower operating temperature using the thermostat alone. These two style of thermostats are sold by GATES and STANT (under the brand name "superstat"). Both are made by the same manufacturer. Stant describes the superstat (gates OE "type" style) as the following...

Stant's SuperStat® uses a high flow venturi for maximum cooling capacity during high temperature, high load operation and employs a unique Weir Valve® for precise flow metering during cold weather, light load operation to ensure stable temperature control under all conditions.

The high strength stainless steel flange is burnished to a bright finish for additional stress relief and added corrosion resistance.

The Stant SuperStat® thermostat is also thicker than most competitor thermostats and our standard reverse poppet thermostat for added strength and longer life.

The power element of SuperStat® is comparable to those used in heavy-duty trucks. Its actuator piston is larger in diameter than the standard thermostat and competitive product. This larger piston delivers 1 1/2 times the power of our standard thermostat and almost 2 1/2 times as much power as the competition for enhanced durability and longer life.

The opening spring of the Stant SuperStat® thermostat is designed with a load that is 50% stronger than our standard reverse poppet thermostat. This heavy-duty spring helps return the thermostat to the closed position and prevent cold running, even under the most adverse conditions. Features and Benefits


Using the navigates system (NaviGates) gates lists the following part numbers for the 2006 Cobalt SS.

OE Exact Thermostat - 180° Reverse Poppet (2 17/64" x 11/16" x 1 3/16") w/1 Seal Part# 34025

OE Type Thermostat - 180º Reverse Poppet (2 17/64" x 7/8" x 1 13/64") w/1 Seal Part# 33943

ACDELCO also offers a replacement thermostat for our car's, the ACDELCO thermostat eliminates the use of the center seal for when the thermostat gets stuck. This is often the seal that people find missing around the center of their thermostat. I personally do not recommend using this as the replacement as that seal is there for a purpose in case of failure, Coolant is still allowed to pass by the tstat.

Why upgrade the thermostat you ask? Well a 160* thermostat is just far too cold for these car's to run efficiently. 180* is perfect, but the way the OEM tstat behaves, most people find consistently average coolant temps above 200 degree's. While the cooling fans themselves dont turn on until above 220 on most car's.

This upgraded thermostat along with 70/30 (water/coolant) coolant and a bottle of water wetter from redline. My car will average between 192-195 at idle in traffic in even the hottest weather. Never having the need to get close to the temp the fans turn on at.

Here's a couple pictures for reference, a blown OEM thermostat on the left vs a brand new gates oe type 33943 180 degree tstat.


 

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Discussion Starter #5
Wow, perfect. Exactly what I needed to know. That makes buying a new one a whole lot easier. Would the part number you listed for an 06 SS work for my car too?

Edit: Just realized that navigates thing is a link, looked it up and its the same part number.
 

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yeh, all cobalt's use the same thermostat, i think actually alot of other GM cars will use the same one as well.
 

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I have 2 codes P0106 and P0128....

Are they related?
P0106 Manifold Absolute Pressure/Barometric Pressure Circuit Range/Performance Problem

P0128 Engine Coolant Temperature (ECT) Below Thermostat Regulating Temperature
 

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Thank you....

I guess I should purchase the MAP sensor for the P0128 code.......
and thermostat for the P0106 since car's heat is working and I tried squeezing the radiator hose feeding block (no bubbles into overflow) as one other member suggested.

---------- Post added at 02:06 PM ---------- Previous post was at 02:04 PM ----------

PS

I forgot to mention had to replace radiator last month....fender bender cracked it
 

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If you hit hard enough to puncture your radiator maybe you cracked your intake plenum giving you the P0106.
 

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I reversed the codes in previous comment anyway fir the P0106 I guess tats possible....the P0106 post says to replace the MAP sensor which is behind plenum correct?
So I'll take a look....radiator not punctured just the mounting top right had small crack.

---------- Post added at 07:48 PM ---------- Previous post was at 07:44 PM ----------

Now for the P0128.....Coolant Thermostat (Coolant Temperature Below Thermostat Regulating Temperature)
Post says replace thermostat....
Any how to's?
Any other suggestions before I do that
 

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---------- Post added at 09:10 PM ---------- Previous post was at 08:55 PM ----------

Doubt your MAP sensor is bad, maybe your throttle body is loose though.

 
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