4AGE 20V Blacktop

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Diary of Swap
Cooling System



85/6 4AGE -> 4AGZE

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Air Intake Filter
Clutch Slave Cylinder
Clutch Master Cylinder
Coolant Flush
Distributor O-Rings
Exhaust Manifold
Fuel Filter

Fuel Pump Cut-off Switch

Ignition Timing
Oil Cooler Hoses
Oil Filter Adapter O-Rings
Oil Pan Gasket
Oxygen Sensor
Radiator Removal
Throttle Body Cleaning
TPS Adjustment
Water Pump


87+ Brake Upgrade
Caliper Rebuild-Front
Caliper Rebuild-Rear
Dust Shield Removal
Parking Brake Cable
SS Braided Brake Line


Ball Joint Replacement
Bushings Install - Front
Bushings Install - Rear
Steering Knuckle Removal
Struts/Springs - Front
Struts/Springs - Rear
Sway Bar End Links


87+ Antenna Replacement
Clear Turn Signals - Front
Clear Turn Signals - Rear
Door Hinges
Interior Door Triangles
Interior Headliner Painting
Interior Trim & Light Lens
Power Window Regulator
Rekeying Trunk Lock
Rust PM - Battery Bracket

Rust PM - Front Wheel Wells
Seats - MK3
Seats - Aftermarket
Shift Boot
SideMarker Mod
Sunroof Rattle
Wiper Switch


2006 Austin
2005 Austin
2005 Topeka NA2005
2004 Galveston
2004 Chattanooga SE2004
2003 Galveston
2002 Austin


Suspension Setup Pics
My MR2 Diary
Latest Pics of My MR2



Here's just a short write-up for changing the thermostat.

1) Drain engine coolant. It's quicker to just tear the housing apart without the pain of draining the coolant, but that way is quite messy. Either way, make sure the engine has cooled ;)

2) Below marks the location of the thermostat housing. To reach the housing it is best to remove the battery and the air filter.


Here's a better view of the housing without the battery and air box in the way.


3) Remove the hose clamp in the red box and the circled 10mm bolts. With the lower bolt you will need an opened end wrench to get to it. The housing should then pop apart in 2 pieces. It may require some force to break the seal of the gasket.


Just another view of the housing:


4) Here's a couple pics of the new and old thermostats.


5) Installation is opposite of removal. Make sure the thermostat is situated in the proper way. The smaller end should go toward the rear of the car. Also make sure to use a new gasket between the housing halves and/or RTV.

6) Refill and burp the coolant system and check for any leaks.

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Thanks for Visiting! - Eric Southers

Disclaimer: This web page in no way replaces the MR2 repair manual. Follow what it says before me. The purpose of this page is to give you a better pictorial description of what to do. I cannot be held responsible for any mishaps caused by this web page.