88Accord-DX
04-07-2006, 04:04 PM
Overflow Bottle-do not mix green & orange anti-freeze together!!
Description
A coolant recovery system differs from other cooling systems in that an overflow bottle is connected to the radiator overflow hose. Overflow bottle is transparent or translucent to permit checking of coolant level without removing the radiator cap. No adjustments or test is required except keeping vent hole or hose clean & checking pressure relief of the radiator cap.
Operation
As coolant temperature rises & pressure in system exceeds pressure releif of radiator cap, excess coolant flows into overflow bottle. As engine cools & coolant contracts, vacuum is formed in the system. Vacuum draws coolant, stored in overflow bottle, back into radiator. In a properly maintained cooling system, the only coolant looses will be through evaperation.
Thermostatically Controlled Electric Fans
Discription
Electrically-driven fans are actuacted by thermal relay switches. Thermal switches turn fan motor on when neccessary & shut fan motor off when not needed. Air conditioned vehicles are equipped with over-ride switches. These switches turn fan motor on whenever air conditioning system is operating. When system is turned off, fan motor is returned to thermal relay.
Fan motor test
Disconnect fan motor wire connector and connect it with 14 gauge wire to a 12-volt battery. If fan runs, motor is ok. This indicates car battery, thermal switch, radiator fan switch, coolant relay, timer relay, coolant temperature switch, or A/C relay may be defective. If the fan motor doesn't run when connected to a battery, replace the fan motor.
Temperature Switch Test
On all models, the radiator fan timer/temperature switch is located on the top of the motor, near upper radiator hose. Switch should have continuity when coolant temperature is 226 degrees F or more.
On A/C equipped models, the radiator fan temperature switch is located in the lower radiator tank. Switch should have continuity when the temperature is 194 degrees F or more.
Fan Controller/Timer & relays
(This relates to EFI Accords)
A solid-state fan controller/timer, located under the right front seat, uses input from the radiator fan timer/temp. switch to operate fan relay. The fan controller/timer also uses input from the radiator fan temperature switch to operate A/C condensor fan relay. Both relays are located in underhood fuse box. No testing is available from the manufacturer. Do not check resistance of fan controller/timer. Relays can be tested, but need some electrical knowledge on how to test them.
Description
A coolant recovery system differs from other cooling systems in that an overflow bottle is connected to the radiator overflow hose. Overflow bottle is transparent or translucent to permit checking of coolant level without removing the radiator cap. No adjustments or test is required except keeping vent hole or hose clean & checking pressure relief of the radiator cap.
Operation
As coolant temperature rises & pressure in system exceeds pressure releif of radiator cap, excess coolant flows into overflow bottle. As engine cools & coolant contracts, vacuum is formed in the system. Vacuum draws coolant, stored in overflow bottle, back into radiator. In a properly maintained cooling system, the only coolant looses will be through evaperation.
Thermostatically Controlled Electric Fans
Discription
Electrically-driven fans are actuacted by thermal relay switches. Thermal switches turn fan motor on when neccessary & shut fan motor off when not needed. Air conditioned vehicles are equipped with over-ride switches. These switches turn fan motor on whenever air conditioning system is operating. When system is turned off, fan motor is returned to thermal relay.
Fan motor test
Disconnect fan motor wire connector and connect it with 14 gauge wire to a 12-volt battery. If fan runs, motor is ok. This indicates car battery, thermal switch, radiator fan switch, coolant relay, timer relay, coolant temperature switch, or A/C relay may be defective. If the fan motor doesn't run when connected to a battery, replace the fan motor.
Temperature Switch Test
On all models, the radiator fan timer/temperature switch is located on the top of the motor, near upper radiator hose. Switch should have continuity when coolant temperature is 226 degrees F or more.
On A/C equipped models, the radiator fan temperature switch is located in the lower radiator tank. Switch should have continuity when the temperature is 194 degrees F or more.
Fan Controller/Timer & relays
(This relates to EFI Accords)
A solid-state fan controller/timer, located under the right front seat, uses input from the radiator fan timer/temp. switch to operate fan relay. The fan controller/timer also uses input from the radiator fan temperature switch to operate A/C condensor fan relay. Both relays are located in underhood fuse box. No testing is available from the manufacturer. Do not check resistance of fan controller/timer. Relays can be tested, but need some electrical knowledge on how to test them.