Best Answer

The Thermostat is located directly in front of the Throttle body assembly. It will be a black tube approximately 1.5 inches in diameter. It is held in place by 2 x 13mm bolts.

Removal instructions.

Tools Required.

1 10mm deep-set socket wrench

1 13mm deep-set socket wrench

1 3/8 or 1/4 inch socket ratchet

1 large pan 12 inches by 18 inches

1 large plastic trash bag (optional)

1 roll of shop tools or reusable shop tools

1 roll of blue painters tape (optional)

Removal instructions

Line the pan with the trash bag or just place the pan directly under the center of the engine on the floor, this will catch any spilled coolant.

Remove the upper section of the Air intake feeder. This is done by removing the thumb screw located at the back passenger side of the assembly. Once you have removed this, just rock it foreword to disconnect it from the Throttle body assembly. Now using either the Blue Painters Tape or a rag, gently tape over or place a rag into the Throttle body top. This will prevent you from dropping nuts or bolts into the intake.

Now you will need the 10mm socket and ratchet. with this you will remove the 2 bolts that hold the Throttle cable tension bracket. for easy of access just set them on the top of the battery or on a secondary tray. Now you will need to remove 2 more 10mm nuts from the other bracket that is connected to the Throttle cable tension bracket, and again 2 more nuts from that another corresponding bracket.

Once you have moved all 3 of the brackets out of the way, you can now removed the 2 stud bolts that hold the Thermostat housing to the engine block. This will require the 13 mm deep-set socket. Once you have removed those bolts, gently pull straight up on the housing tube. There will be a small amount (about 2 cups or 1/2 liter of fluid that will spill... Did you place the tube below the engine... good clean just go easier.) When you remove the housing tube you will now expose the thermostat. Remove this one an discard it. Replace the thermostat and O-ring with new ones. Do not reuse the O-ring, as it will leak, causing issue with your Blazer. Now just reverse these steps to reassemble the brackets and Thermostat housing.

Make sure to tighten the Thermostat housing bolts as tight as you can get them WITHOUT leverage.

Start your car, and wait for it to come to operating temperature about 190 to 210 degrees and check for leaks. If you see a leak just tighten the bolts another 1/4 turn, till the leak stops.

-----WARNING---- Do not exceed 1 full turn beyond tight as you may now have damaged the block.

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โˆ™ 2009-09-20 06:47:00
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Q: Where is thermostat for 2002 blazer ls?
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