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You didn't specify 4 or 6 cylinder so here's what I got: .5L, 1.6L, 1.8L (except K8) and 2.2L Engines

See Figures 1 and 2 # Disconnect the negative battery cable. Drain the radiator to below the level of the thermostat. # If necessary, remove the air cleaner assembly. # If necessary, disconnect the coolant temperature switch at the thermostat housing. Fig. 1: Exploded view of the thermostat assembly for the 1.5L, 1.6L and 1.8L (except K8) engines

Fig. 2: Exploded view of the thermostat assembly for the 2.2L engine

# Remove the upper radiator hose. # Remove the mounting nuts, thermostat housing, thermostat and gasket. Do not pry the housing off. To install:

# Clean the thermostat housing and the cylinder head mating surfaces. # Insert the thermostat into the rear cylinder head housing with the jiggle pin at the top. The spring side of the thermostat should face the housing. # Position a new gasket onto the studs with the seal print side facing the rear cylinder housing. # Install the thermostat housing and 2 nuts. Tighten the nuts to 14-22 ft. lbs. (19-5 Nm). # Install the upper radiator hose. # If detached, connect the coolant temperature switch. # If removed, install the air cleaner housing. # Fill the cooling system. Connect the negative battery cable, start the engine and check for leaks. Check the coolant level and add coolant, as necessary. 2.0L Engine

See Figures 3, 4, 5, 6, 7, 8, 9 and 10 # Disconnect the negative battery cable. # Drain the engine coolant from the radiator to below the level of the thermostat. Fig. 3: To remove the thermostat, first drain the cooling system, then remove the radiator hose-to-thermostat housing cover clamp ...

Fig. 4: ... by sliding back on the hose. Note the alignment marks on the hose and housing cover (arrows)

Fig. 5: Disconnect the hose from the thermostat housing cover

Fig. 6: Loosen the thermostat housing cover attaching bolts ...

Fig. 7: ... then remove them ...

Fig. 8: ... along with the housing cover/water outlet

Fig. 9: Remove the thermostat from the housing by simply pulling it outward

Fig. 10: When installing the new thermostat, note the tab (arrow) which seats into a notch in the housing. Jiggle pin must face straight up

# Disconnect the lower radiator hose from the engine. # Remove the housing bolts, thermostat housing, thermostat and gasket. Do not pry the housing off. To install:

# Clean the thermostat housing and the cylinder head mating surfaces. # Make sure that the thermostat jiggle pin is aligned with the gasket projection. # Install the thermostat to the housing. Align the gasket projection with the opening in the housing. The spring side of the thermostat should face into the housing. # Install the thermostat housing cover and tighten both bolts to 14-19 ft. lbs. (19-25 Nm). # Fill the cooling system. Connect the negative battery cable, start the engine and check for leaks. Check the coolant level and add coolant, as necessary. 1.8L DOHC (K8) and 2.5L Engines

See Figure 11 # Disconnect the negative battery cable. # Drain the engine coolant from the radiator to below the level of the thermostat. # Remove the water outlet pipe mounting bolt and detach the pipe from the outlet housing. Remove and discard the O-ring. Fig. 11: Exploded view of the thermostat assembly for the 1.8L (K8) and 2.5L engines

# Remove the engine harness bracket bolt and position the harness aside. # Remove the housing bolt, thermostat housing, thermostat and gasket. Do not pry the housing off. To install:

# Clean the thermostat housing and the cylinder head mating surfaces. # Insert the thermostat into the housing with the jiggle pin at the top. The spring side of the thermostat should face the housing. # Position a new gasket with the projection facing the same direction as the thermostat jiggle pin. # Install the thermostat housing cover and loosely install the lower bolt. Install the engine harness bracket and loosely install the bolt. Tighten both bolts to 14-19 ft. lbs. (19-25 Nm). # Position a new O-ring onto the water pipe and wet the O-ring with fresh engine coolant. # Install the pipe to the outlet housing, using care to not rip or otherwise damage the O-ring, and install the mounting bolt. Tighten the mounting bolt to 14-19 ft. lbs. (19-25 Nm). # Fill the cooling system. Connect the negative battery cable, start the engine and check for leaks. Check the coolant level and add coolant, as necessary. 2.3L Engine

See Figure 12 # Disconnect the negative battery cable. # Drain the engine coolant from the radiator to below the level of the thermostat. # Remove the charge air cooler air duct. Fig. 12: Exploded view of the thermostat assembly for the 2.3L engine. Also shown are the removed components for thermostat access

# Remove the air cleaner housing. # Remove the resonator. # Remove the two thermostat housing bolts, the housing and the thermostat. To install:

# Thoroughly clean the thermostat housing and cylinder head mating surfaces. # Position the thermostat on the housing and align the projection on the thermostat to the notch in the housing. # Position the housing/thermostat assembly to the cylinder head and install the two retaining bolts. Tighten the bolts to 14-18 ft. lbs. (19-25 Nm). # Install the resonator, air cleaner housing and air duct assemblies. Tighten all attaching bolts to 70-95 inch lbs. (8-11 Nm). # Fill the cooling system. Connect the negative battery cable, start the engine and check for leaks. Check the coolant level and add coolant, as necessary.

You didn't specify 4 or 6 cylinder so here's what I got: .5L, 1.6L, 1.8L (except K8) and 2.2L Engines

See Figures 1 and 2 # Disconnect the negative battery cable. Drain the radiator to below the level of the thermostat. # If necessary, remove the air cleaner assembly. # If necessary, disconnect the coolant temperature switch at the thermostat housing. Fig. 1: Exploded view of the thermostat assembly for the 1.5L, 1.6L and 1.8L (except K8) engines

Fig. 2: Exploded view of the thermostat assembly for the 2.2L engine

# Remove the upper radiator hose. # Remove the mounting nuts, thermostat housing, thermostat and gasket. Do not pry the housing off. To install:

# Clean the thermostat housing and the cylinder head mating surfaces. # Insert the thermostat into the rear cylinder head housing with the jiggle pin at the top. The spring side of the thermostat should face the housing. # Position a new gasket onto the studs with the seal print side facing the rear cylinder housing. # Install the thermostat housing and 2 nuts. Tighten the nuts to 14-22 ft. lbs. (19-5 Nm). # Install the upper radiator hose. # If detached, connect the coolant temperature switch. # If removed, install the air cleaner housing. # Fill the cooling system. Connect the negative battery cable, start the engine and check for leaks. Check the coolant level and add coolant, as necessary. 2.0L Engine

See Figures 3, 4, 5, 6, 7, 8, 9 and 10 # Disconnect the negative battery cable. # Drain the engine coolant from the radiator to below the level of the thermostat. Fig. 3: To remove the thermostat, first drain the cooling system, then remove the radiator hose-to-thermostat housing cover clamp ...

Fig. 4: ... by sliding back on the hose. Note the alignment marks on the hose and housing cover (arrows)

Fig. 5: Disconnect the hose from the thermostat housing cover

Fig. 6: Loosen the thermostat housing cover attaching bolts ...

Fig. 7: ... then remove them ...

Fig. 8: ... along with the housing cover/water outlet

Fig. 9: Remove the thermostat from the housing by simply pulling it outward

Fig. 10: When installing the new thermostat, note the tab (arrow) which seats into a notch in the housing. Jiggle pin must face straight up

# Disconnect the lower radiator hose from the engine. # Remove the housing bolts, thermostat housing, thermostat and gasket. Do not pry the housing off. To install:

# Clean the thermostat housing and the cylinder head mating surfaces. # Make sure that the thermostat jiggle pin is aligned with the gasket projection. # Install the thermostat to the housing. Align the gasket projection with the opening in the housing. The spring side of the thermostat should face into the housing. # Install the thermostat housing cover and tighten both bolts to 14-19 ft. lbs. (19-25 Nm). # Fill the cooling system. Connect the negative battery cable, start the engine and check for leaks. Check the coolant level and add coolant, as necessary. 1.8L DOHC (K8) and 2.5L Engines

See Figure 11 # Disconnect the negative battery cable. # Drain the engine coolant from the radiator to below the level of the thermostat. # Remove the water outlet pipe mounting bolt and detach the pipe from the outlet housing. Remove and discard the O-ring. Fig. 11: Exploded view of the thermostat assembly for the 1.8L (K8) and 2.5L engines

# Remove the engine harness bracket bolt and position the harness aside. # Remove the housing bolt, thermostat housing, thermostat and gasket. Do not pry the housing off. To install:

# Clean the thermostat housing and the cylinder head mating surfaces. # Insert the thermostat into the housing with the jiggle pin at the top. The spring side of the thermostat should face the housing. # Position a new gasket with the projection facing the same direction as the thermostat jiggle pin. # Install the thermostat housing cover and loosely install the lower bolt. Install the engine harness bracket and loosely install the bolt. Tighten both bolts to 14-19 ft. lbs. (19-25 Nm). # Position a new O-ring onto the water pipe and wet the O-ring with fresh engine coolant. # Install the pipe to the outlet housing, using care to not rip or otherwise damage the O-ring, and install the mounting bolt. Tighten the mounting bolt to 14-19 ft. lbs. (19-25 Nm). # Fill the cooling system. Connect the negative battery cable, start the engine and check for leaks. Check the coolant level and add coolant, as necessary. 2.3L Engine

See Figure 12 # Disconnect the negative battery cable. # Drain the engine coolant from the radiator to below the level of the thermostat. # Remove the charge air cooler air duct. Fig. 12: Exploded view of the thermostat assembly for the 2.3L engine. Also shown are the removed components for thermostat access

# Remove the air cleaner housing. # Remove the resonator. # Remove the two thermostat housing bolts, the housing and the thermostat. To install:

# Thoroughly clean the thermostat housing and cylinder head mating surfaces. # Position the thermostat on the housing and align the projection on the thermostat to the notch in the housing. # Position the housing/thermostat assembly to the cylinder head and install the two retaining bolts. Tighten the bolts to 14-18 ft. lbs. (19-25 Nm). # Install the resonator, air cleaner housing and air duct assemblies. Tighten all attaching bolts to 70-95 inch lbs. (8-11 Nm). # Fill the cooling system. Connect the negative battery cable, start the engine and check for leaks. Check the coolant level and add coolant, as necessary.

You didn't specify 4 or 6 cylinder so here's what I got: .5L, 1.6L, 1.8L (except K8) and 2.2L Engines

See Figures 1 and 2 # Disconnect the negative battery cable. Drain the radiator to below the level of the thermostat. # If necessary, remove the air cleaner assembly. # If necessary, disconnect the coolant temperature switch at the thermostat housing. Fig. 1: Exploded view of the thermostat assembly for the 1.5L, 1.6L and 1.8L (except K8) engines

Fig. 2: Exploded view of the thermostat assembly for the 2.2L engine

# Remove the upper radiator hose. # Remove the mounting nuts, thermostat housing, thermostat and gasket. Do not pry the housing off. To install:

# Clean the thermostat housing and the cylinder head mating surfaces. # Insert the thermostat into the rear cylinder head housing with the jiggle pin at the top. The spring side of the thermostat should face the housing. # Position a new gasket onto the studs with the seal print side facing the rear cylinder housing. # Install the thermostat housing and 2 nuts. Tighten the nuts to 14-22 ft. lbs. (19-5 Nm). # Install the upper radiator hose. # If detached, connect the coolant temperature switch. # If removed, install the air cleaner housing. # Fill the cooling system. Connect the negative battery cable, start the engine and check for leaks. Check the coolant level and add coolant, as necessary. 2.0L Engine

See Figures 3, 4, 5, 6, 7, 8, 9 and 10 # Disconnect the negative battery cable. # Drain the engine coolant from the radiator to below the level of the thermostat. Fig. 3: To remove the thermostat, first drain the cooling system, then remove the radiator hose-to-thermostat housing cover clamp ...

Fig. 4: ... by sliding back on the hose. Note the alignment marks on the hose and housing cover (arrows)

Fig. 5: Disconnect the hose from the thermostat housing cover

Fig. 6: Loosen the thermostat housing cover attaching bolts ...

Fig. 7: ... then remove them ...

Fig. 8: ... along with the housing cover/water outlet

Fig. 9: Remove the thermostat from the housing by simply pulling it outward

Fig. 10: When installing the new thermostat, note the tab (arrow) which seats into a notch in the housing. Jiggle pin must face straight up

# Disconnect the lower radiator hose from the engine. # Remove the housing bolts, thermostat housing, thermostat and gasket. Do not pry the housing off. To install:

# Clean the thermostat housing and the cylinder head mating surfaces. # Make sure that the thermostat jiggle pin is aligned with the gasket projection. # Install the thermostat to the housing. Align the gasket projection with the opening in the housing. The spring side of the thermostat should face into the housing. # Install the thermostat housing cover and tighten both bolts to 14-19 ft. lbs. (19-25 Nm). # Fill the cooling system. Connect the negative battery cable, start the engine and check for leaks. Check the coolant level and add coolant, as necessary. 1.8L DOHC (K8) and 2.5L Engines

See Figure 11 # Disconnect the negative battery cable. # Drain the engine coolant from the radiator to below the level of the thermostat. # Remove the water outlet pipe mounting bolt and detach the pipe from the outlet housing. Remove and discard the O-ring. Fig. 11: Exploded view of the thermostat assembly for the 1.8L (K8) and 2.5L engines

# Remove the engine harness bracket bolt and position the harness aside. # Remove the housing bolt, thermostat housing, thermostat and gasket. Do not pry the housing off. To install:

# Clean the thermostat housing and the cylinder head mating surfaces. # Insert the thermostat into the housing with the jiggle pin at the top. The spring side of the thermostat should face the housing. # Position a new gasket with the projection facing the same direction as the thermostat jiggle pin. # Install the thermostat housing cover and loosely install the lower bolt. Install the engine harness bracket and loosely install the bolt. Tighten both bolts to 14-19 ft. lbs. (19-25 Nm). # Position a new O-ring onto the water pipe and wet the O-ring with fresh engine coolant. # Install the pipe to the outlet housing, using care to not rip or otherwise damage the O-ring, and install the mounting bolt. Tighten the mounting bolt to 14-19 ft. lbs. (19-25 Nm). # Fill the cooling system. Connect the negative battery cable, start the engine and check for leaks. Check the coolant level and add coolant, as necessary. 2.3L Engine

See Figure 12 # Disconnect the negative battery cable. # Drain the engine coolant from the radiator to below the level of the thermostat. # Remove the charge air cooler air duct. Fig. 12: Exploded view of the thermostat assembly for the 2.3L engine. Also shown are the removed components for thermostat access

# Remove the air cleaner housing. # Remove the resonator. # Remove the two thermostat housing bolts, the housing and the thermostat. To install:

# Thoroughly clean the thermostat housing and cylinder head mating surfaces. # Position the thermostat on the housing and align the projection on the thermostat to the notch in the housing. # Position the housing/thermostat assembly to the cylinder head and install the two retaining bolts. Tighten the bolts to 14-18 ft. lbs. (19-25 Nm). # Install the resonator, air cleaner housing and air duct assemblies. Tighten all attaching bolts to 70-95 inch lbs. (8-11 Nm). # Fill the cooling system. Connect the negative battery cable, start the engine and check for leaks. Check the coolant level and add coolant, as necessary.

You didn't specify 4 or 6 cylinder so here's what I got: .5L, 1.6L, 1.8L (except K8) and 2.2L Engines

See Figures 1 and 2 # Disconnect the negative battery cable. Drain the radiator to below the level of the thermostat. # If necessary, remove the air cleaner assembly. # If necessary, disconnect the coolant temperature switch at the thermostat housing. Fig. 1: Exploded view of the thermostat assembly for the 1.5L, 1.6L and 1.8L (except K8) engines

Fig. 2: Exploded view of the thermostat assembly for the 2.2L engine

# Remove the upper radiator hose. # Remove the mounting nuts, thermostat housing, thermostat and gasket. Do not pry the housing off. To install:

# Clean the thermostat housing and the cylinder head mating surfaces. # Insert the thermostat into the rear cylinder head housing with the jiggle pin at the top. The spring side of the thermostat should face the housing. # Position a new gasket onto the studs with the seal print side facing the rear cylinder housing. # Install the thermostat housing and 2 nuts. Tighten the nuts to 14-22 ft. lbs. (19-5 Nm). # Install the upper radiator hose. # If detached, connect the coolant temperature switch. # If removed, install the air cleaner housing. # Fill the cooling system. Connect the negative battery cable, start the engine and check for leaks. Check the coolant level and add coolant, as necessary. 2.0L Engine

See Figures 3, 4, 5, 6, 7, 8, 9 and 10 # Disconnect the negative battery cable. # Drain the engine coolant from the radiator to below the level of the thermostat. Fig. 3: To remove the thermostat, first drain the cooling system, then remove the radiator hose-to-thermostat housing cover clamp ...

Fig. 4: ... by sliding back on the hose. Note the alignment marks on the hose and housing cover (arrows)

Fig. 5: Disconnect the hose from the thermostat housing cover

Fig. 6: Loosen the thermostat housing cover attaching bolts ...

Fig. 7: ... then remove them ...

Fig. 8: ... along with the housing cover/water outlet

Fig. 9: Remove the thermostat from the housing by simply pulling it outward

Fig. 10: When installing the new thermostat, note the tab (arrow) which seats into a notch in the housing. Jiggle pin must face straight up

# Disconnect the lower radiator hose from the engine. # Remove the housing bolts, thermostat housing, thermostat and gasket. Do not pry the housing off. To install:

# Clean the thermostat housing and the cylinder head mating surfaces. # Make sure that the thermostat jiggle pin is aligned with the gasket projection. # Install the thermostat to the housing. Align the gasket projection with the opening in the housing. The spring side of the thermostat should face into the housing. # Install the thermostat housing cover and tighten both bolts to 14-19 ft. lbs. (19-25 Nm). # Fill the cooling system. Connect the negative battery cable, start the engine and check for leaks. Check the coolant level and add coolant, as necessary. 1.8L DOHC (K8) and 2.5L Engines

See Figure 11 # Disconnect the negative battery cable. # Drain the engine coolant from the radiator to below the level of the thermostat. # Remove the water outlet pipe mounting bolt and detach the pipe from the outlet housing. Remove and discard the O-ring. Fig. 11: Exploded view of the thermostat assembly for the 1.8L (K8) and 2.5L engines

# Remove the engine harness bracket bolt and position the harness aside. # Remove the housing bolt, thermostat housing, thermostat and gasket. Do not pry the housing off. To install:

# Clean the thermostat housing and the cylinder head mating surfaces. # Insert the thermostat into the housing with the jiggle pin at the top. The spring side of the thermostat should face the housing. # Position a new gasket with the projection facing the same direction as the thermostat jiggle pin. # Install the thermostat housing cover and loosely install the lower bolt. Install the engine harness bracket and loosely install the bolt. Tighten both bolts to 14-19 ft. lbs. (19-25 Nm). # Position a new O-ring onto the water pipe and wet the O-ring with fresh engine coolant. # Install the pipe to the outlet housing, using care to not rip or otherwise damage the O-ring, and install the mounting bolt. Tighten the mounting bolt to 14-19 ft. lbs. (19-25 Nm). # Fill the cooling system. Connect the negative battery cable, start the engine and check for leaks. Check the coolant level and add coolant, as necessary. 2.3L Engine

See Figure 12 # Disconnect the negative battery cable. # Drain the engine coolant from the radiator to below the level of the thermostat. # Remove the charge air cooler air duct. Fig. 12: Exploded view of the thermostat assembly for the 2.3L engine. Also shown are the removed components for thermostat access

# Remove the air cleaner housing. # Remove the resonator. # Remove the two thermostat housing bolts, the housing and the thermostat. To install:

# Thoroughly clean the thermostat housing and cylinder head mating surfaces. # Position the thermostat on the housing and align the projection on the thermostat to the notch in the housing. # Position the housing/thermostat assembly to the cylinder head and install the two retaining bolts. Tighten the bolts to 14-18 ft. lbs. (19-25 Nm). # Install the resonator, air cleaner housing and air duct assemblies. Tighten all attaching bolts to 70-95 inch lbs. (8-11 Nm). # Fill the cooling system. Connect the negative battery cable, start the engine and check for leaks. Check the coolant level and add coolant, as necessary.

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Q: Where is the thermostat located on a 2001 Mazda 626?
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