Are the radiator fans on an '05 EX-L supposed to be dual-speed? If so, what triggers high speed?
Low speed = fans in series = 6V per fan
High speed = fans in parallel = 12V per fan
I ask because the A/C in my Odyssey is crap when the van isn't moving. It is fine at highway speeds. I have not seen/heard the fans go high-speed even when the engine is hot and the A/C is on. They always seem to be on at the same low speed.
I did some checking tonight, and both fans come on, low speed, with the engine on or off and the A/C on. If the A/C is off, the fans don't come on until the engine gets pretty hot, and then they only come on for a brief period. I couldn't get the fans to come on high by having the engine hot and the A/C on, but that may have been because it was hard to get the engine hot enough to trigger the fans based on engine temp alone.
I checked the fans and the relays. I can see where they are usually connected in series and powered through the A/C fan relay. I can see how they could be connected in parallel, and I can get the fans to go high-speed if I jumper around the relays. The relays check out fine, but I'm not 100% sure about the connections behind the relays. I don't have a wiring diagram and it was sweltering in my garage, so I gave up.
I had the recall work done for the transmission shudder. This was supposed to update the computer past the version which fixed a bug preventing high-speed fan operation, but I haven't seen a difference in A/C performance since then.
If this is a lame programming "feature" I'd feel comfortable rigging some relays, a thermostat, and some logic to make the A/C kick on the high speed fans when hot but ensure the fans still come on low speed for engine cooling, as long as the fans are able to handle 12V each.
Thanks,
Adam
Low speed = fans in series = 6V per fan
High speed = fans in parallel = 12V per fan
I ask because the A/C in my Odyssey is crap when the van isn't moving. It is fine at highway speeds. I have not seen/heard the fans go high-speed even when the engine is hot and the A/C is on. They always seem to be on at the same low speed.
I did some checking tonight, and both fans come on, low speed, with the engine on or off and the A/C on. If the A/C is off, the fans don't come on until the engine gets pretty hot, and then they only come on for a brief period. I couldn't get the fans to come on high by having the engine hot and the A/C on, but that may have been because it was hard to get the engine hot enough to trigger the fans based on engine temp alone.
I checked the fans and the relays. I can see where they are usually connected in series and powered through the A/C fan relay. I can see how they could be connected in parallel, and I can get the fans to go high-speed if I jumper around the relays. The relays check out fine, but I'm not 100% sure about the connections behind the relays. I don't have a wiring diagram and it was sweltering in my garage, so I gave up.
I had the recall work done for the transmission shudder. This was supposed to update the computer past the version which fixed a bug preventing high-speed fan operation, but I haven't seen a difference in A/C performance since then.
If this is a lame programming "feature" I'd feel comfortable rigging some relays, a thermostat, and some logic to make the A/C kick on the high speed fans when hot but ensure the fans still come on low speed for engine cooling, as long as the fans are able to handle 12V each.
Thanks,
Adam