The 2017 GMC Acadia thermostat R and R (remove and replace) is a common maintenance job that every Acadia owner can handle at home. A failing thermostat can cause overheating, poor fuel economy, and costly engine damage if ignored. This guide walks you through every step with clear instructions, helpful tips, and warnings to avoid common mistakes.
This is a comprehensive guide about 2017 gmc acadia thermostat r and r.
Key Takeaways
- Easy DIY Job: Replacing the thermostat on a 2017 GMC Acadia is manageable with basic tools and about an hour of your time.
- Prevent Engine Damage: A stuck thermostat can cause overheating or poor heating, leading to expensive repairs down the road.
- Use OEM or Quality Parts: Always choose a reputable thermostat brand to ensure proper fit and long-lasting performance.
- Flush the Coolant: Flushing the system during replacement helps remove debris and keeps your cooling system running smoothly.
- Bleed the System Properly: Air pockets after installation can cause overheating, so proper bleeding is essential.
- Watch for Warning Signs: Temperature gauge fluctuations, heater issues, and coolant leaks are early symptoms of a bad thermostat.
[FEATURED_IMAGE_PLACEHOLDER]
The 2017 GMC Acadia is a reliable three-row SUV that serves families well. But like any vehicle, it needs regular maintenance to keep running smoothly. One job that many Acadia owners overlook is the thermostat. This small but critical part regulates your engine temperature and keeps everything in balance. When it fails, the results can be frustrating and expensive.
Performing a thermostat R and R on your 2017 GMC Acadia is one of the most straightforward repairs you can do. R and R stands for remove and replace, and it is a term you will hear often in automotive circles. Whether you are a seasoned DIYer or a complete beginner, this guide will give you everything you need.
Many people put off thermostat replacement because they fear the complexity. In reality, the process is much simpler than most engine jobs. You do not need specialized tools or years of mechanic experience. With a basic socket set, some coolant, and about an hour, you can complete the job yourself.
The thermostat in your 2017 GMC Acadia sits in the thermostat housing, which is part of the cooling system. Its job is simple but vital. It opens and closes to regulate coolant flow based on engine temperature. When the engine is cold, the thermostat stays closed to help it warm up quickly. Once the engine reaches operating temperature, the thermostat opens to let coolant circulate through the radiator.
When this small component fails, it can either get stuck open or stuck closed. A stuck-open thermostat means the engine takes too long to warm up. A stuck-closed thermostat causes the engine to overheat. Both situations are bad news for your Acadia. The good news is that replacing it is quick and affordable.
## Signs Your 2017 GMC Acadia Thermostat Needs Replacement
Catching a failing thermostat early can save you from major engine problems. Here are the most common signs that your thermostat is going bad.
### Temperature Gauge Fluctuations
One of the first signs is an erratic temperature gauge. Your needle might bounce between normal and hot, or it may sit higher than usual. This happens because the thermostat is not opening and closing at the right times. Sometimes the gauge stays on the cold side, and other times it spikes into the red zone.
### Engine Overheating
If your temperature gauge climbs into the red, pull over safely. A thermostat stuck in the closed position blocks coolant from reaching the radiator. This causes rapid overheating, which can warp the head gasket or crack the engine block. Never ignore an overheating warning.
### Heater Not Working Properly
Your cabin heater relies on hot coolant flowing through the heater core. A stuck-open thermostat keeps coolant from reaching the proper temperature. As a result, your heater blows lukewarm air even when the engine has been running for a while. If you notice weak heat in your Acadia, the thermostat could be the culprit.
### Coolant Leaks
The thermostat housing can develop leaks over time. You might notice a puddle of coolant under your parked Acadia. Sometimes the leak comes from the housing gasket rather than the thermostat itself, but the fix is similar. Inspect the area around the thermostat housing regularly for any signs of dripping or residue.
### Poor Fuel Economy
A thermostat stuck open keeps the engine running cooler than designed. When the engine runs cold, it uses more fuel because the fuel injection system adds extra fuel to compensate. If you notice your fuel economy dropping without any other explanation, a bad thermostat might be to blame.
## Tools and Parts You Will Need
Before you start, gather everything you need. Having the right tools ready makes the job go much smoother.
### Required Tools
- Socket set (10mm, 13mm, and 15mm are commonly needed)
- Wrench set
- Flathead and Phillips screwdrivers
- Coolant catch pan
- Funnel
- Gloves and safety glasses
- Rag or paper towels
- Torque wrench (optional but recommended)
### Parts and Materials
- New thermostat (OEM or quality aftermarket)
- Thermostat gasket or O-ring
- Dexcool or GM-recommended coolant
- Thermostat housing bolt kit (if bolts are worn)
Pro tip: If you are working in your garage and also maintain other projects, keeping your workspace comfortable helps. Many people set up a table and chair in their garage for parts organization. Some even rent temporary workspace furniture for bigger projects. If you are curious about how much table and chair rentals cost for a garage setup, a quick search online can give you great options.
### Choosing the Right Thermostat
The 2017 GMC Acadia uses a specific thermostat with the correct temperature rating. OEM thermostats are designed to open at around 195 degrees Fahrenheit. Aftermarket thermostats vary, so always check the specifications before purchasing. Going with a higher or lower temperature rating can affect engine performance and void your warranty.
## Step-by-Step Thermostat Removal
Now let us get into the actual work. Follow these steps carefully, and you will have your thermostat out in no time.
### Step 1: Let the Engine Cool Completely
Never work on a hot engine. Wait at least two hours after driving, or let the Acadia sit overnight. The cooling system is pressurized, and opening it while hot can cause severe burns.
### Step 2: Locate the Thermostat Housing
Open the hood and locate the thermostat housing on the 2017 GMC Acadia. It is typically found on the engine side of the upper radiator hose. The housing connects to the engine block with a few bolts. Look for a metal or plastic housing with a rubber hose attached.
### Step 3: Drain the Coolant
Place your catch pan underneath the radiator drain plug. Open the drain plug and let the coolant flow out completely. You need to drain enough coolant so the level drops below the thermostat housing. This prevents a mess when you disconnect the hose.
### Step 4: Disconnect the Upper Radiator Hose
Using your wrench or socket, loosen the clamp on the upper radiator hose where it connects to the thermostat housing. Carefully pull the hose off. Have your rag ready for any remaining coolant that spills out.
### Step 5: Remove the Thermostat Housing Bolts
Unbolt the thermostat housing from the engine block. The 2017 Acadia typically has two or three bolts holding the housing in place. Keep track of each bolt and store them safely.
### Step 6: Remove the Old Thermostat
Lift off the thermostat housing and pull out the old thermostat. Notice which way the thermostat is oriented. The spring-loaded valve should face the engine. Take a photo before removing it so you can reference the orientation during installation.
Clean the mating surfaces thoroughly. Remove any old gasket material or debris from both the housing and the engine block. Use a plastic scraper to avoid scratching the surfaces.
## Installing the New Thermostat
With the old thermostat out, you are ready to install the new one. This part is just as important as the removal.
### Step 1: Install the New Gasket
Place the new thermostat gasket or O-ring onto the thermostat housing. Make sure it sits evenly in its groove. If your housing uses a reusable gasket, apply a thin layer of silicone sealant to ensure a proper seal.
### Step 2: Position the New Thermostat
Set the new thermostat into the housing with the spring-loaded valve facing the engine, just like the old one. Make sure the thermostat sits fully seated in its groove. The wax element inside the thermostat responds to heat, so proper seating is critical for accurate operation.
### Step 3: Reattach the Thermostat Housing
Place the housing back onto the engine block and thread in the bolts by hand first. Then tighten them gradually in a crisscross pattern. This ensures even pressure and prevents warping the housing. Do not overtighten, as plastic housings can crack easily.
### Step 4: Reconnect the Upper Radiator Hose
Slide the upper radiator hose back onto the thermostat housing and tighten the clamp securely. Make sure there are no gaps or twists in the hose.
### Step 5: Refill the Coolant
Using a funnel, refill the radiator with the recommended coolant. The 2017 GMC Acadia uses Dexcool or a compatible GM-approved coolant. Fill slowly to minimize air pockets. Top off the reservoir to the full mark.
### Step 6: Bleed the Cooling System
Bleeding the system is one of the most important steps. Air trapped in the cooling system can cause hotspots and overheating. The 2017 Acadia has a bleed screw on the thermostat housing. Open it slightly while the engine runs until coolant flows out without bubbles. Then close the screw tightly.
Let the engine warm up to operating temperature with the heater on full blast. This helps circulate coolant through the heater core and pushes out any remaining air. Watch the temperature gauge carefully during this process.
## Post-Replacement Tips and Common Mistakes
After completing the thermostat R and R, there are a few things to keep in mind to ensure long-term reliability.
### Run the Engine and Monitor
Start the engine and let it idle for 15 to 20 minutes. Watch the temperature gauge closely. It should rise steadily and then hold steady at the normal operating temperature. If the gauge fluctuates or climbs too high, turn off the engine and check for air pockets.
### Check for Leaks
After the engine cools down, look under the vehicle and around the thermostat housing for any coolant leaks. A small drip is not uncommon right after installation, but a steady leak means you need to recheck the gasket and housing bolts.
### Common Mistakes to Avoid
- Forgetting to bleed the system: Air pockets are the number one cause of overheating after a thermostat replacement. Always bleed the system thoroughly.
- Using the wrong thermostat: An incorrect temperature rating can cause poor engine performance. Always match the OEM specifications.
- Reusing old gaskets: Old gaskets do not seal properly. Always use a new gasket or O-ring with every replacement.
- Over-tightening bolts: Cranking down on bolts can crack the housing or strip the threads in the engine block. Tighten to the manufacturer’s torque specification.
- Ignoring coolant type: Using the wrong coolant can cause corrosion and clog the cooling system. Stick with GM-recommended coolant.
### When to Seek Professional Help
Most thermostat replacements go smoothly for DIYers. However, if you notice the engine still overheating after the replacement, there may be a deeper issue. Problems with the water pump, radiator fan, or head gasket can mimic thermostat symptoms. Do not hesitate to visit a qualified mechanic if the problem persists.
If you are doing this repair in a workspace where you also handle other projects, keeping your area clean and organized helps. Some people find that maintaining their garage setup, including cleaning leather office chairs or other furniture they use during projects, makes the whole experience more pleasant. For those who work on vehicles and furniture alike, knowing how to clean and maintain a leather office chair can be a useful skill to have around the shop.
## Frequently Asked Questions
How long does a thermostat R and R take on a 2017 GMC Acadia?
Most people complete the job in 45 minutes to an hour. The actual removal and installation takes about 30 minutes, but draining and refilling the coolant adds extra time. If you are new to the process, give yourself a full afternoon to work comfortably.
How much does it cost to replace the thermostat on a 2017 GMC Acadia?
The thermostat itself costs between 15 and 40 dollars for an aftermarket part, or 40 to 80 dollars for an OEM part. If you take it to a shop, labor typically adds 100 to 200 dollars. Doing it yourself saves you the labor cost entirely.
Can I drive my 2017 GMC Acadia with a bad thermostat?
You should not drive a vehicle with a known thermostat failure. A stuck-closed thermostat causes rapid overheating, which can lead to severe engine damage. A stuck-open thermostat causes poor heating and increased fuel consumption. Replace it as soon as possible.
What happens if I install the thermostat upside down?
Installing the thermostat backwards prevents it from opening at the correct temperature. This can cause the engine to overheat or run too cold. Always check the orientation mark on the thermostat and follow the installation instructions carefully.
Should I replace the thermostat gasket every time?
Yes, always replace the gasket or O-ring. Old gaskets lose their ability to seal properly, which can lead to coolant leaks. New gaskets are inexpensive and ensure a leak-free installation every time.
How often should the thermostat be replaced on a 2017 GMC Acadia?
Thermostats do not have a strict replacement schedule. They typically last 100,000 miles or more. However, it is a good idea to inspect the thermostat during every cooling system service. If you notice any symptoms of failure, test or replace it promptly.
## Conclusion
The 2017 GMC Acadia thermostat R and R is a straightforward repair that keeps your engine running at the right temperature. By catching the signs early and following the steps in this guide, you can save money and avoid costly shop visits. A new thermostat, a fresh gasket, and a properly bled cooling system will keep your Acadia running strong for years to come.
Do not let a small thermostat problem turn into a big engine issue. The next time you notice temperature gauge fluctuations or weak heater output, grab your tools and give this job a try. Your 2017 GMC Acadia will thank you for it.
Frequently Asked Questions
What is 2017 gmc acadia thermostat r and r?
2017 gmc acadia thermostat r and r is an important topic with many practical applications.