LOOKING FOR A DIAG TREE FOR THE FAN CIRCUIT ON A 89 HONDA PRELUDE SI

SOURCE: 89 honda prelude power steering belt

there is an adjustment bolt on the back side of the idler pulley . you just loosen up the nut on the front of the pulley , then turn the 12 mm bolt under the pump on the back side of the pulley.

SOURCE: 1986 honda prelude heater

Radiator flushes can cause more problems than fix sometimes. Before you go removing the dash first replace the thermostat if you follow the lower radiator hose to the engine this is the thermostat housing.Remove the three 10mm bolts and the housing should come apart. Make sure you put the thermostat in the right way and not upside down. The larger end with the spring goes in first toward the engine and the little vent should be on top. When you fill it back up with a 60/40 mixture of coolant make sure you open the bleed hole on the thermostat housing to get out any air and tighten when coolant comes out with no air bubbles. Start the car and hopefully the heat is better. If not the heater core is the two coolant hoses on the firewall remove both hoses and check the flow with a water hose put the hose to both sides to get out any debris. If the flow is slow and does not improve you will have to pull out the heater core which means removing most of the lower dash pulling out the evaporator if you have A/C. Make sure you get a manual. Hope this helps.

SOURCE: Constant Control Relay Module

wire into your hot side of air bypass solieniod and to ground near battery wire into yuor fan that will do the trick

SOURCE: Aux. Fan not comming on when hot or cold... Boils

Replace your temperature sensor. There is a sensor specifically for the cooling fans that triggers the relays, and tells the fans to turn on/off. The relays won't energize unless it gets a signal from that sensor.

detour342

• 200 Answers
• Posted on Jul 13, 2010

SOURCE: jump air compressor ac works replace relays same issue HONDA

the compressor may be low on freopn but, the fan problem is most likely the fan motor as it is the low temp fan and will run more often than both fans...to test see if you can switch the fan plugin to the other fan watch carefully that it does not get too hot as the second fan is a safety fan that works as high temp or when using the A\C