Batman Posted February 21, 2013 Share Posted February 21, 2013 This has probably been answered befor but I'm new.my a/ c blower will not work on high.could possibly be resistor on ac box?have seen them on eBay but ther are different styles.does anyone have or can tell me or have a pic of what original one should look like? Mine appears to have been replaced and I don't trust that is correct.thanks.steve Quote Link to comment Share on other sites More sharing options...
stangeba Posted February 22, 2013 Share Posted February 22, 2013 Sorry, I don't have A/C but I remember reading things about the HIGH SPEED RELAY. I don't think any resistance is used for high speed, it's full voltage via the relay. I'm sure someone else will chime in. Good Luck! Bruce Quote Link to comment Share on other sites More sharing options...
Mo's70MCs Posted February 22, 2013 Share Posted February 22, 2013 Depending on the year, this schematic may not fully apply. Though if you look closely, it can be either a blown in-line fuse or a bad relay. Very rare for the switch to be bad. Though the high speed was never controlled via the resistor. Â Â Â Quote Link to comment Share on other sites More sharing options...
Sam (Bones) Posted February 22, 2013 Share Posted February 22, 2013 Quote Link to comment Share on other sites More sharing options...
MGD72Monte Posted February 22, 2013 Share Posted February 22, 2013 If the fan works, the motor should be fine, if you can change the speed settings on all settings except high, the resistor sounds like it is working, I find it hard to believe the switch would be bad on the high setting. So as others have said, sounds like a relay issue. Do you hear the relay click when you throw the switch to high? Quote Link to comment Share on other sites More sharing options...
cbolt Posted February 22, 2013 Share Posted February 22, 2013 The resistor is bypassed in high speed mode so you are looking at either a relay or the switch. I recently had the same problem and a new relay fixed it. Having said that I also had a bad switch in the past and bought a relay, swapped it, no joy. Had to order the switch. Come to think of it I have also replaced my fusable link at some point in the past but it was a long time ago and I cannot recall the actual problem that lead me to change it. Dollars to doughnuts it will more than likely be the relay. You should be able to read the voltage in and out to determine if the issue is before the relay if you have a meter and want to save the $20 on the relay. Quote Link to comment Share on other sites More sharing options...
Batman Posted February 22, 2013 Author Share Posted February 22, 2013 Thanks everybody. Quote Link to comment Share on other sites More sharing options...
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