🔧 Compass - Thermostat Replacement

On your Compass, the thermostat controls coolant flow to keep engine temperature stable. Replacing it usually means replacing the thermostat housing assembly (the thermostat is built into the housing) and then refilling/bleeding the cooling system so you don’t trap air.

Difficulty Level: Intermediate | Estimated Time: 1.5-3.0 hours

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⚠️ Safety & Precautions

• ⚠️ Never open the coolant reservoir hot; pressurized coolant can burn you.
• ⚠️ Support the Compass with jack stands; never rely on a jack alone.
• ⚠️ Keep coolant off belts and electrical connectors; rinse spills with water.
• ⚠️ Coolant is toxic; capture and dispose of it properly.
• Disconnecting the battery is recommended if you’ll unplug sensors near the housing.

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🔧 Required Tools

You'll need the following tools for this repair:

• Safety glasses
• Nitrile gloves
• Floor jack (rated 3-ton minimum)
• Jack stands (rated 3-ton minimum)
• Wheel chocks
• Drain pan (at least 2-gallon)
• 3/8" drive ratchet
• 3/8" drive extension set
• Metric socket set (8mm-15mm)
• Torque wrench (inch-pound or low-range Nm)
• Hose clamp pliers
• Pick tool
• Trim clip remover
• Flat-blade screwdriver
• Funnel
• Shop towels

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🔩 Required Parts

HowToo sells all the parts you need for this repair:

• Thermostat housing assembly (with thermostat) - Qty: 1
• O-ring seal (if not included with housing) - Qty: 1
• Engine coolant (OAT, 50/50 premix) - Qty: As needed to refill
• Hose clamp(s) (if original clamps are weak/damaged) - Qty: As needed

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📋 Before You Begin

• Park on level ground, set the parking brake, and let the engine cool fully (overnight is best).
• Place wheel chocks behind the rear wheels.
• Remove the key and keep it away from the vehicle.
• If you’ll unplug any sensors: loosen the negative terminal using a 10mm socket and isolate it so it can’t touch again.

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🔨 Step-by-Step Instructions

Follow these steps in order:

Step 1: I need 2 quick details to give exact bolt torques and the correct housing procedure

• Please upload a clear photo of the thermostat housing area on the engine (or a photo of the thermostat housing part you bought).
• Tell me whether you’re replacing the complete thermostat housing assembly (most common) or you have a standalone thermostat insert.

Step 2: Depressurize and set up to drain coolant

• With the engine cold, slowly loosen the coolant reservoir cap by hand to release any leftover pressure.
• Place a drain pan (at least 2-gallon) under the lower radiator area.

Step 3: Gain access

• Raise the front using a floor jack (rated 3-ton minimum) and support with jack stands (rated 3-ton minimum).
• Remove the lower splash shield using a trim clip remover and metric socket set (8mm-15mm) as needed.

Step 4: Drain enough coolant to get below thermostat level

• Drain coolant from the radiator drain (if equipped) using a flat-blade screwdriver, or remove the lower hose using hose clamp pliers.
• Only drain what you need. You just want coolant level below the thermostat housing to reduce spillage.

Step 5: Remove intake ducting/engine cover (if it blocks access)

• Remove the engine cover by pulling upward by hand if equipped.
• Loosen intake clamps using a flat-blade screwdriver and move the ducting aside as needed.

Step 6: Disconnect electrical connector(s) and hoses at the housing

• Unplug connector locks carefully (do not pull wires). Use a pick tool to lift the tab if needed.
• Release coolant hoses using hose clamp pliers and twist hoses gently to break them free.
• Twist first, then pull. This helps avoid tearing the hose.

Step 7: Remove thermostat housing bolts

• Remove the housing mounting bolts using a metric socket set (8mm-15mm) with a 3/8" drive ratchet and 3/8" drive extension set.
• Lift the housing off and catch any remaining coolant with the drain pan (at least 2-gallon).
• Torque specs will be provided after your photo so you don’t crack the housing or strip threads.

Step 8: Clean the sealing surface

• Remove the old O-ring and clean the mating surface with shop towels.
• Use a pick tool gently for stuck O-ring material (don’t gouge the aluminum surface).

Step 9: Install the new housing and reconnect hoses

• Install the new O-ring (lightly wet it with clean coolant).
• Set the new housing in place and start bolts by hand first to prevent cross-threading.
• Tighten bolts evenly using a torque wrench (inch-pound or low-range Nm) in a crisscross pattern.
• Reconnect hoses using hose clamp pliers and reinstall electrical connectors until they click.

Step 10: Refill and bleed the cooling system

• Refill the reservoir using a funnel with engine coolant (OAT, 50/50 premix).
• Start the engine and set the cabin heat to HOT with the fan on low to help move coolant through the heater core.
• Top off as the level drops. Watch for leaks around the housing and hoses.
• I’ll give the exact bleed point/sequence after the photo (bleed locations can vary by hose routing/housing style).

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✅ After Repair

• Let the engine reach normal operating temperature and confirm the heat blows hot from the vents.
• Shut off, let it cool completely, then recheck the coolant level and top off if needed.
• Inspect for leaks after the first short drive and again the next morning.
• If the check engine light was on, you may need to clear codes after the repair.

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💰 DIY vs Shop Cost

Shop Cost: $450-$850 (parts + labor)

DIY Cost: $60-$220 (parts only)

You Save: $230-$790 by doing it yourself!

Shop labor rates vary but typically run $100-$150/hour. This repair takes a shop approximately 1.5-3.0 hours.

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🎯 Ready to get started?

HowToo makes it easy: same-day/2-day shipping on every part, plus all the tools and specialty tools you need! Check out the parts and tools sections below to add everything to your cart.