Engine Coolant Thermostat Guide for the 2007-2013 Chevrolet Impala
Learn how to spot a failing thermostat in your Impala and choose the right replacement part to protect your engine.
- A failing thermostat in a 2007-2013 Impala will most likely get stuck open, causing a P0128 check engine light code and poor cabin heat.
- Replacing the thermostat is a DIY-friendly job on the 3.5L and 3.9L V6 engines, but bleeding air from the system afterward is crucial.
- For best results, use an OEM ACDelco thermostat or a quality aftermarket brand like Gates or Motorad to ensure correct engine operating temperature.
- There are no safety recalls for the thermostat, but it is a very common failure point on these cars.
Is Your Impala's Thermostat Failing?
A thermostat failure in the 2007-2013 Impala is a common issue, but the signs can be confusing. The part can fail in two ways: stuck open or stuck closed. For this generation of Impala, thermostats most often fail in the 'stuck-open' position.
Symptoms of a Thermostat Stuck Open (Most Common)
- Check Engine Light: The most frequent sign is a check engine light with diagnostic trouble code (DTC) P0128. This code specifically means the engine isn't warming up as fast as the computer expects.
- Engine Runs Too Cool: You may notice the temperature gauge takes a very long time to reach the middle or never gets there at all, especially during highway driving.
- No Cabin Heat: Because the engine isn't getting hot enough, the heater may blow lukewarm or cold air, even when the engine has been running for a while. 🎬 Watch: Fix no heat issues by replacing your thermostat.
- Fans Running Constantly: In some cases, a P0128 code can trick the car's computer, causing the radiator fans to run at full speed and the temperature gauge to stop working entirely.
Symptoms of a Thermostat Stuck Closed
- Engine Overheating: The temperature gauge will climb into the hot range, and you may see an "Engine Hot A/C Off" message on the dashboard.
- Coolant Leaks or Steam: Extreme pressure from overheating can cause coolant to leak from the thermostat housing or nearby hoses.
Known Issues: P0128 Code and TSBs
The P0128 code is extremely common for these vehicles and almost always points to a thermostat that is stuck open. While a General Motors Technical Service Bulletin (TSB) from 2007 suggested that a computer re-program could fix this code on some 2006 models, the most reliable and common repair is to replace the thermostat itself. No safety recalls have been issued for the thermostat on the 2007-2013 Impala.
Choosing the Right Aftermarket Thermostat
When shopping for a replacement, you'll find several brands. For a critical part like the thermostat, choosing a quality component is important to ensure your engine runs at the correct temperature.
Brand Quality Tiers
- OEM-Equivalent (Best Choice): ACDelco is the original equipment manufacturer (OEM) for General Motors. Choosing an ACDelco thermostat guarantees the correct fit and, most importantly, the correct temperature rating that your Impala was designed for. While sometimes more expensive, it's the safest bet for avoiding future issues.
- Quality Aftermarket (Good Choice): Brands like Gates and Motorad are well-known in the aftermarket and produce reliable cooling system parts. They are designed to meet or exceed OEM specifications and are a dependable alternative to the OEM part. In some cases, Motorad has even been found to be the supplier for ACDelco parts.
- Performance Brands (Use with Caution): Mishimoto is known for performance cooling parts, including thermostats that open at a lower temperature. For a standard 2007-2013 Impala, using a low-temp thermostat is not recommended. It can prevent the engine from reaching its proper operating temperature, hurting fuel economy and potentially triggering a P0128 code—the very problem you're trying to fix. Stick to their OEM-temperature replacements if you choose this brand.
Pro Tip: Many thermostat failures are actually failures of the rubber gasket or seal, not the thermostat mechanism itself. Always replace the gasket or the complete housing assembly when installing a new thermostat to prevent leaks.
Aftermarket Thermostat Cost for 2007-2013 Impala
| Part Type | Typical Price Range |
|---|---|
| New Aftermarket Thermostat (Part Only) | $18.73 - $55.00 |
| New Aftermarket Thermostat & Housing Assembly | $45.00 - $125.15 |
| New OEM (ACDelco) Thermostat & Housing | $50.00 - $150.00+ |
| Shop Labor for Installation | $150 - $250 |
Note: Prices are estimates and can vary based on brand, retailer, and your vehicle's specific engine (3.5L/3.9L vs. 3.6L). 🎬 Watch: Step-by-step DIY guide for the 3.9L engine. The 3.6L V6 (2012-2013) uses a more complex and expensive housing assembly.
Frequently Asked Questions (FAQ)
Where is the thermostat located on my 2007-2013 Impala?
For the common 3.5L and 3.9L V6 engines, the thermostat is located on the driver's side of the engine, where the lower radiator hose connects to the engine block. For the 3.6L V6 found in 2012-2013 models, the thermostat is part of a larger housing assembly located at the back of the engine, near the firewall, making it more difficult to access.
Can I replace the thermostat myself?
Yes, for the 3.5L and 3.9L engines, this is a very DIY-friendly job that requires basic hand tools. The process involves draining some coolant, removing two bolts, and swapping the part. 🎬 See this 3.5L engine thermostat replacement walkthrough. The most critical step is properly bleeding the air out of the cooling system after you refill it to prevent overheating.
Should I replace just the thermostat or the whole housing?
For the 3.5L and 3.9L engines, you can typically replace just the thermostat and its gasket. However, if the plastic housing is old, brittle, or shows signs of leaking, replacing the complete housing assembly is a good preventative measure.
Do I need a special type of coolant?
Yes, your Impala requires a specific type of coolant. Always use DEX-COOL extended-life coolant or a compatible equivalent. Mixing coolant types can cause damage to the cooling system.
Helpful Videos
Technical Specifications
OEM Part Numbers: 12622316 12636991 12657142
Standard operating temperature is typically 180°F or 195°F depending on the specific engine and year. The thermostat for 3.5L/3.9L engines is a standalone part with a gasket, while the 3.6L uses an integrated housing assembly.
We Have This Part in Stock
The information in this article is provided for general reference and educational purposes only. Vehicle specifications, procedures, and part compatibility can vary by production date, trim level, and region. Always consult your vehicle's factory service manual and verify part numbers before purchasing or performing repairs. Safety-critical components such as airbags, seat belts, and braking systems should be installed by a qualified professional.
- Chevrolet Impala:
- 🎬 Helpful Videos
- 🛍️ Shop This Part
- Is Your Impala's Thermostat Failing?
- Symptoms of a Thermostat Stuck Open (Most Common)
- Symptoms of a Thermostat Stuck Closed
- Known Issues: P0128 Code and TSBs
- Choosing the Right Aftermarket Thermostat
- Brand Quality Tiers
- Aftermarket Thermostat Cost for 2007-2013 Impala
- Frequently Asked Questions (FAQ)
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