I have a problem with my blower motor that I need help with. My car is a 1993 Honda Civic Si HB with 88,000 miles on the body. The engine, transmission, suspension, brakes, and ECU are from a 1997 Type-R and have 30,000 miles on them. I also have AEM True Power under drive pulleys for the power steering and alternator.

The problem that I am having is that the blower fan on my AC/Heater does not work all the time. When I start the car up it usually doesn't work. If while I am driving I turn the car off and then back on (while I am rolling) sometimes the blower fan will start working. When the blower fan is working it blows cold (if AC is on) or hot (if heater is on) air and works great. When I go to work in the morning the turn off and then back on again trick usually works every time on the first try. Later in the day when it is hotter it usually does not work until several tries. The fan has no other problems. It works at all blowing levels and once it is on it does not ever shut off unless I turn it off.

The only theory I have right now is that the blower fan is operated by some sort of relay switch. When the car is started this relay switch does not get energized because the car has an under drive pulley and does not provide enough power. This theory is a long shot because I do not know how the AC/Heater fan works.

Has anyone else experienced a similar problem? Anyone have any ideas on what the problem may be? Anyway willing to scan or email me the debugging section for the blower fan in a HELMS manual? I have a HELMS manual for the car but I cannot find it.

Thanks in advance to anyone that can help.

- John

 

It could be the underdrive pulley, but somehow I doubt it, especially if it comes on later. What I'm thinking is a loose or bad connection or maybe the console switches are starting to go bad as well. I have a similar problem with my dash lights. Sometimes they work, sometimes they don't. When they don't, a few good slams on the top of the dash usually get the back up and working. I'm at school right now, but I'll check my Helm's manual when I get home and see if there is anything in there. I'd highly recommend you get one for yourself too, they're worth every penny. Seeya.

 

Ok I will have to give more thought to why this is happening. BUT rest assure that the problem is NOT related to the underdrive pulley in either way. Remember ONLY the a/c compressor is operated by a belt, and doesn't affect the blowing of air in anyway. So if this problem was because of the pulley it would only affect your cold air, not the symptoms you have. There is a relay for the blower motor however, it is near the fuse box inside the car, not the one inside the engine bay. Try troubleshooting the electrical system, see if power is going to the fan when you have this problem, that will tell you if it's in the fan or before the fan.