🔧 Thermostat - Replacement

The thermostat on your CR-V controls how quickly the engine warms up and helps keep coolant temperature stable. If it sticks open, the engine runs too cool; if it sticks closed, it can overheat fast. Replacing it means draining some coolant, removing the thermostat housing, and installing a new thermostat and gasket.

Difficulty Level: Intermediate | Estimated Time: 2-3 hours

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⚠️ Safety & Precautions

• Let the engine cool completely before opening the cooling system. Hot coolant can cause severe burns.
• Do not open the radiator cap when the engine is hot.
• Use jack stands if you raise the vehicle. Never rely on a jack alone.
• Keep coolant away from pets and children. It is toxic.
• Battery disconnect is not required for this repair.

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🔧 Required Tools

You'll need the following tools for this repair:

• 10mm socket
• 12mm socket
• Ratchet
• Short extension
• Torque wrench
• Pliers
• Drain pan
• Funnel
• Plastic scraper
• Safety glasses
• Nitrile gloves
• Jack stands

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🔩 Required Parts

HowToo sells all the parts you need for this repair:

• Thermostat - Qty: 1
• Thermostat gasket - Qty: 1
• Honda Type 2 coolant - Qty: 2 gallons

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📋 Before You Begin

• Park on level ground and set the parking brake.
• Let the engine cool fully before starting.
• Place a drain pan under the radiator drain area.
• Work on a cold engine only.

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🔨 Step-by-Step Instructions

Follow these steps in order:

Step 1: Drain the coolant

• Use a drain pan under the radiator.
• Open the radiator cap only when the engine is cold.
• Use pliers to loosen the radiator drain plug area as needed and drain enough coolant to drop the level below the thermostat housing.
• Save clean coolant if it is reusable.

Step 2: Remove the air intake duct if needed

• Use a 10mm socket and ratchet to remove the air intake duct or air box parts that block access to the thermostat housing.
• Move the duct aside for working room.

Step 3: Remove the thermostat housing bolts

• Locate the thermostat housing on the engine coolant outlet.
• Use a 10mm socket, short extension, and ratchet to remove the housing bolts.
• Keep track of bolt locations.

Step 4: Remove the old thermostat

• Pull the housing straight off.
• Note the thermostat orientation before removal. The spring side faces the engine.
• Remove the old thermostat and gasket.
• Use a plastic scraper to clean the sealing surface.

Step 5: Install the new thermostat

• Install the new thermostat in the same orientation as the old one.
• Install the new gasket.
• Set the housing back in place carefully so the gasket stays seated.
• Torque to 12 Nm (9 ft-lbs) using a torque wrench and 10mm socket.

Step 6: Reinstall removed intake parts

• Use a 10mm socket and ratchet to reinstall the air intake duct or air box parts.
• Make sure all clamps and connections are tight.

Step 7: Refill the cooling system

• Use a funnel to refill with Honda Type 2 coolant.
• Fill the radiator first, then the reservoir to the MAX line.
• Leave the radiator cap off at first for bleeding.

Step 8: Bleed air from the system

• Start the engine with the heater set to HOT and the blower on low.
• Let it idle and watch the coolant level.
• Add coolant as the level drops.
• When the thermostat opens, the upper radiator hose will get hot.
• Install the radiator cap once no more air bubbles appear.
• Top off after the first heat cycle.

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✅ After Repair

• Check for coolant leaks at the thermostat housing and drain area.
• Verify the engine warms up normally and the heater blows hot air.
• Recheck coolant level after the engine cools completely.
• Drive briefly and watch the temperature gauge for normal operation.

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💰 DIY vs Shop Cost

Shop Cost: $250-$500 (parts + labor)

DIY Cost: $40-$90 (parts only)

You Save: $210-$410 by doing it yourself!

Shop labor rates vary but typically run $100-$150/hour. This repair takes a shop approximately 1.5-2.5 hours.

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🎯 Ready to get started?

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