4.2.1. Removing the radiator
- Drain the coolant according to the instructions in chapter 4.1.
- Disconnect the upper and lower water hoses after releasing their clamps.
- Disconnect the battery terminals.
- Disconnect the fan motor cable harness wire connection and also disconnect the wire from the temperature switch to turn on the fan.
- If you have an automatic transmission, disconnect both oil cooler hoses. At the same time, drain the fluid, collecting it in an appropriate manner.
- If the air filter hose is in the way, disconnect it.
- Disconnect the bypass hose between the expansion tank and the radiator.
- Unscrew the fan casing and move it to the side.
- On each side, unscrew the radiator mounting bracket and pull out the radiator, without touching the body parts of the engine. Check for cracks in the cooling system hoses and replace them if damage is found. Check for leaks on the radiator, which are often determined by corrosion. Take a leaking radiator to a repair shop for repair. If you have a pump for checking radiators, you can test the radiator cap under pressure. To do this, install the pump on the cap, as shown in Figure 121, and put it under pressure. The valve in the cap should open at a pressure of 0.8-1.0 atm. The permissible minimum pressure is 0.6 atm. In the same way, you can also put the radiator itself under pressure after installing it. To do this, connect the pump, as shown in Figure 122 and use the pump to raise the pressure to 1.2 atm. The pressure readings should not decrease during the test. Only the radiator unit itself is supplied as a spare part. Since special tools are required to remove and secure the upper and lower water heaters, you should contact a TOYOTA workshop to assemble the radiator as a set.
Fig. 121. Checking the radiator cap using a radiator test pump
Fig. 122. To check the radiator leak points, connect the test pump (1) using a hose (2) to the radiator filler neck.
4.2.2. Removal
Removal is carried out in the reverse order. If defects are suspected, be sure to replace the hoses. Fill the cooling system as described in section 4.1. After warming up the engine to operating temperature, check for leaks. If there is a pressure test pump, test the system under pressure (no more than 1.2 atm). If the pressure drops, there is a leak. In this case, park the car on a dry place to determine where the fluid is leaking.