# Front Blower motor speed reduces from max after 15-20 min on manual setting **URL:** \ **Category:** Maintenance/Repairs\ **Tags:** hyundai, santa-fe-sport\ **Created:** [October 1, 2020, 2:09pm UTC](https://community.cartalk.com/t/front-blower-motor-speed-reduces-from-max-after-15-20-min-on-manual-setting/170694 "2020-10-01T14:09:19Z")\ **Posts on this page:** 12\ **Page:** 1
**Author:** ![chiefmissile](https://avatars.discourse-cdn.com/v4/letter/c/ecae2f/32.png) [@chiefmissile](https://community.cartalk.com/u/chiefmissile)\ **Post date:** [October 1, 2020, 2:09pm UTC](https://community.cartalk.com/t/front-blower-motor-speed-reduces-from-max-after-15-20-min-on-manual-setting/170694/1 "2020-10-01T14:09:19Z")
So I noticed that when A/C was on high speed, the force of the air would decrease over a 15-20 min period, this was when I was demanding A/C on the Low setting (AC is cold) Even though the blower control readout was showing it to be on high. I found that switching the system off and then back on resolved the issue for another 15-20 min. I replaced the resistor but this has not solved the issue. No funny noises from the blower motor, runs great other than the speed reduces when on high after a period of time. Not noticed it reducing driving in the city, more so on the highway…what could the problem be? Thanks in advance ---
**Author:** ![chiefmissile](https://avatars.discourse-cdn.com/v4/letter/c/ecae2f/32.png) [@chiefmissile](https://community.cartalk.com/u/chiefmissile)\ **Post date:** [October 1, 2020, 2:19pm UTC](https://community.cartalk.com/t/front-blower-motor-speed-reduces-from-max-after-15-20-min-on-manual-setting/170694/2 "2020-10-01T14:19:36Z")
Oh and after reading another post about this, I should add that the fan speed reduces even when not demanding A/C ? ---
**Author:** ![old\_mopar\_guy](https://avatars.discourse-cdn.com/v4/letter/o/6bbea6/32.png) [@old\_mopar\_guy](https://community.cartalk.com/u/old_mopar_guy)\ **Post date:** [October 1, 2020, 3:30pm UTC](https://community.cartalk.com/t/front-blower-motor-speed-reduces-from-max-after-15-20-min-on-manual-setting/170694/3 "2020-10-01T15:30:29Z")
Sounds like your blower motor is failing. ---
**Author:** ![Purebred](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/purebred/32/46796_2.png) [@Purebred](https://community.cartalk.com/u/Purebred)\ **Post date:** [October 1, 2020, 6:30pm UTC](https://community.cartalk.com/t/front-blower-motor-speed-reduces-from-max-after-15-20-min-on-manual-setting/170694/4 "2020-10-01T18:30:42Z")
Agreed, when the blower motor gets hot, it slows down. ---
**Author:** ![Cougar](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/cougar/32/21348_2.png) [@Cougar](https://community.cartalk.com/u/Cougar)\ **Post date:** [October 1, 2020, 7:00pm UTC](https://community.cartalk.com/t/front-blower-motor-speed-reduces-from-max-after-15-20-min-on-manual-setting/170694/5 "2020-10-01T19:00:05Z")
If your vehicle uses normal resistors to limit the motor speed then I would suspect the blower relay contacts are heating up and causing a voltage drop, which would change the speed of the motor. If the relay is getting real warm or hot after a bit that would be a sure sign of trouble. ---
**Author:** ![Nevada\_545](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/nevada_545/32/41232_2.png) [@Nevada\_545](https://community.cartalk.com/u/Nevada_545)\ **Post date:** [October 1, 2020, 7:06pm UTC](https://community.cartalk.com/t/front-blower-motor-speed-reduces-from-max-after-15-20-min-on-manual-setting/170694/6 "2020-10-01T19:06:29Z")
The evaporator core is icing, there is a thermo probe in the evaporator, the computer should cycle the system to keep the evaporator from going below freezing. > [@chiefmissile](#): > > Not noticed it reducing driving in the city, more so on the highway In stop and go traffic the A/C system generally doesn’t perform well enough to get cold enough to freeze. ---
**Author:** ![Purebred](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/purebred/32/46796_2.png) [@Purebred](https://community.cartalk.com/u/Purebred)\ **Post date:** [October 1, 2020, 7:15pm UTC](https://community.cartalk.com/t/front-blower-motor-speed-reduces-from-max-after-15-20-min-on-manual-setting/170694/7 "2020-10-01T19:15:19Z")
The OP states the blower also slows with the AC off. ---
**Author:** ![Nevada\_545](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/nevada_545/32/41232_2.png) [@Nevada\_545](https://community.cartalk.com/u/Nevada_545)\ **Post date:** [October 1, 2020, 7:43pm UTC](https://community.cartalk.com/t/front-blower-motor-speed-reduces-from-max-after-15-20-min-on-manual-setting/170694/8 "2020-10-01T19:43:15Z")
> [@Purebred](#): > > OP states the blower also slows with the AC off. I suspect the OP is only adjusting the temperature setting and not switching off the compressor. ---
**Author:** ![Beancounter](https://avatars.discourse-cdn.com/v4/letter/b/59ef9b/32.png) [@Beancounter](https://community.cartalk.com/u/Beancounter)\ **Post date:** [October 1, 2020, 9:03pm UTC](https://community.cartalk.com/t/front-blower-motor-speed-reduces-from-max-after-15-20-min-on-manual-setting/170694/9 "2020-10-01T21:03:33Z")
Especially if it’s a manual control another thing to check is the actual fan speed control switch. Don’t know your car’s age but it was a common problem on early Hyundai’s Replacement parts were available from [Koraps.com](http://Koraps.com) ---
**Author:** ![chiefmissile](https://avatars.discourse-cdn.com/v4/letter/c/ecae2f/32.png) [@chiefmissile](https://community.cartalk.com/u/chiefmissile)\ **Post date:** [October 12, 2020, 3:23pm UTC](https://community.cartalk.com/t/front-blower-motor-speed-reduces-from-max-after-15-20-min-on-manual-setting/170694/10 "2020-10-12T15:23:02Z")
Thanks fir your reply, so how can I resolve the issue, how do I stop the icing? ---
**Author:** ![old\_mopar\_guy](https://avatars.discourse-cdn.com/v4/letter/o/6bbea6/32.png) [@old\_mopar\_guy](https://community.cartalk.com/u/old_mopar_guy)\ **Post date:** [October 12, 2020, 9:12pm UTC](https://community.cartalk.com/t/front-blower-motor-speed-reduces-from-max-after-15-20-min-on-manual-setting/170694/11 "2020-10-12T21:12:03Z")
Get your A/C system tested and serviced. ---
**Author:** ![chiefmissile](https://avatars.discourse-cdn.com/v4/letter/c/ecae2f/32.png) [@chiefmissile](https://community.cartalk.com/u/chiefmissile)\ **Post date:** [October 12, 2020, 11:13pm UTC](https://community.cartalk.com/t/front-blower-motor-speed-reduces-from-max-after-15-20-min-on-manual-setting/170694/12 "2020-10-12T23:13:59Z")
Great thanks, job for next spring 😃. Happy thanksgiving