Where is the switch for the radiator fan?
The radiator fan switch is located on the thermostat housing and if jumped should operate the fans. no, when the AC is on they both seem to work , even when the temp goes up, or if you turn off the AC , then the fan stops turning. I found underneath the Thermostat housing a single wire going into the engine block, is this the sensor switch.
Why does my radiator fan not work when the AC is on?
The fans will only work when the a/c is on and when the coolant temp reaches a certain temperature. Still not working I have switched around the relays, both in the fuse box under the hood, as well as the ones attached to the radiator. Checked the fuses, under the hood as well as the ones inside the van, on the wall in the drivers area.
What to do if your AC pressure switch is off?
If the low or high pressures are off, there is a larger problem with the system. With the OBDII port on your vehicle, you can use a code scanner to check for DTCs. You can also use the code scanner to erase codes once you repair the problem.
Why is my radiator fan not working on my Honda Civic?
Figure 1. 1999 Civic under-hood fuse box with location of fan relay (circled in red). Another easy way you can check if the radiator fan switch relay is bad is to swap the radiator fan relay with the condenser fan relay. If the radiator fan begins working, this is an indication that the fan relay is bad.
Where is the thermostat plug in a Honda Civic?
Figure 2. Location of thermo switch in a Honda Civic’s thermostat housing. The connector has four holes: two are for the electrical wires of the thermo switch plug and the other two are for the plug’s locking mechanism. Make sure to test the electrical holes and not the locking holes.
Why does my AC stop working when I jump the relay?
A few hours later my dumb self decided to try to add a little oil thru the low side and it wouldn’t take much (my guess is because it was under pressure). After that ac stopped working again since neither the compressor nor fan come on, only when i take the relay out and start jumping with a wire.
Why are the fans not running in my Honda?
Lift bonnet/hood then check and see if fans are running, both should be. Do not assume because they aren’t that your fans are bad. It could be a temp sensor failure. Was this answer helpful? Yes its done, Interior fan all the way on, AC on. Engine on, in neutral or park handbrake/E brake on. Both fans are On /Off a few seconds only.