# Heater problem **URL:** \ **Category:** Maintenance/Repairs\ **Tags:** canyon, gmc\ **Created:** [December 20, 2010, 6:09pm UTC](https://community.cartalk.com/t/heater-problem/58958 "2010-12-20T18:09:27Z")\ **Posts on this page:** 8\ **Page:** 1
**Author:** ![pokey1972](https://avatars.discourse-cdn.com/v4/letter/p/e19adc/32.png) [@pokey1972](https://community.cartalk.com/u/pokey1972)\ **Post date:** [December 20, 2010, 6:09pm UTC](https://community.cartalk.com/t/heater-problem/58958/1 "2010-12-20T18:09:27Z")
replaced blower motor resistor on my wifes truck and lasted two days. bought another one and lasted about a month. heater only works on 4 setting when resistor goes out. what is causing resistors to keep going out. ---
**Author:** ![tardis](https://avatars.discourse-cdn.com/v4/letter/t/f0a364/32.png) [@tardis](https://community.cartalk.com/u/tardis)\ **Post date:** [December 20, 2010, 7:18pm UTC](https://community.cartalk.com/t/heater-problem/58958/2 "2010-12-20T19:18:16Z")
Your blower motor is dragging. It’s drawing too much current for the amount of air that it puts out, so the resistors are burning up. You need to replace the blower motor (and the resistor again). ---
**Author:** ![Joseph\_E\_Meehan](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/joseph_e_meehan/32/21_2.png) [@Joseph\_E\_Meehan](https://community.cartalk.com/u/Joseph_E_Meehan)\ **Post date:** [December 20, 2010, 9:08pm UTC](https://community.cartalk.com/t/heater-problem/58958/3 "2010-12-20T21:08:11Z")
It could be the motor itself. Maybe a baring is going out. However I am a little confused by your description. Let’s tell us about exactly what is happening and when. What speeds work when. Example: 1, 2, 3 work but nothing on high (4) Or maybe 2, 3 and high work but not 1. ---
**Author:** ![pokey1972](https://avatars.discourse-cdn.com/v4/letter/p/e19adc/32.png) [@pokey1972](https://community.cartalk.com/u/pokey1972)\ **Post date:** [December 21, 2010, 2:12am UTC](https://community.cartalk.com/t/heater-problem/58958/4 "2010-12-21T02:12:31Z")
when working fan seems to work fine. no noises or anything. if i spend the fan by my hand it seems to spin fine with no drag whatsoever. when resistor goes out fan only blows on number 4 setting and no other one. all speeds worked fine after i put in second resistor for about a month and now it went out. ---
**Author:** ![\_Deleted\_User1111116](https://avatars.discourse-cdn.com/v4/letter/_/ac91a4/32.png) [@\_Deleted\_User1111116](https://community.cartalk.com/u/_Deleted_User1111116)\ **Post date:** [December 21, 2010, 2:21am UTC](https://community.cartalk.com/t/heater-problem/58958/5 "2010-12-21T02:21:03Z")
I dont see any mention of what year n make this is ---
**Author:** ![pokey1972](https://avatars.discourse-cdn.com/v4/letter/p/e19adc/32.png) [@pokey1972](https://community.cartalk.com/u/pokey1972)\ **Post date:** [December 21, 2010, 6:00pm UTC](https://community.cartalk.com/t/heater-problem/58958/6 "2010-12-21T18:00:34Z")
2005 gmc canyon 4 wheel drive 5 cylinder. read on a website about the pigtail that plugs into the resistor being burnt on some trucks and having to be replaced but mine looks fine. people on website seem to suggest that this is a common problem on these trucks but like i said mine seems fine. no burnt marks or melting or anything. ---
**Author:** ![cigroller](https://avatars.discourse-cdn.com/v4/letter/c/c68b51/32.png) [@cigroller](https://community.cartalk.com/u/cigroller)\ **Post date:** [December 21, 2010, 8:54pm UTC](https://community.cartalk.com/t/heater-problem/58958/7 "2010-12-21T20:54:11Z")
As noted, this is common when the blower motor is drawing too many amps. Its probably what blew the first resistor. ---
**Author:** ![pokey1972](https://avatars.discourse-cdn.com/v4/letter/p/e19adc/32.png) [@pokey1972](https://community.cartalk.com/u/pokey1972)\ **Post date:** [December 22, 2010, 12:35am UTC](https://community.cartalk.com/t/heater-problem/58958/8 "2010-12-22T00:35:36Z")
i dont think its the blower motor because of above reasons.