# 1999 lexus gs400 no ac or heat blowing **URL:** \ **Category:** Maintenance/Repairs\ **Created:** [March 11, 2019, 4:40pm UTC](https://community.cartalk.com/t/1999-lexus-gs400-no-ac-or-heat-blowing/136280 "2019-03-11T16:40:29Z")\ **Posts on this page:** 17\ **Page:** 1
**Author:** ![johnnytoomsq\_149328](https://avatars.discourse-cdn.com/v4/letter/j/edb3f5/32.png) [@johnnytoomsq\_149328](https://community.cartalk.com/u/johnnytoomsq_149328)\ **Post date:** [March 11, 2019, 4:40pm UTC](https://community.cartalk.com/t/1999-lexus-gs400-no-ac-or-heat-blowing/136280/1 "2019-03-11T16:40:29Z")
Hi all, i have a 99 lexus gs400, the inside lights/radio were not working, so i replaced the fuses, yay. Now the ac/heat no longer blow through the vents. It worked fine prior to changing the fuses out. Please help me, what do i do? It does make a click noise when changing the modes, but no air or heat blowing at all, i can hear the car idle differently when turning off/on but nothing else. Any help would be appreciated! ---
**Author:** ![Tester](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/tester/32/15976_2.png) [@Tester](https://community.cartalk.com/u/Tester)\ **Post date:** [March 11, 2019, 4:45pm UTC](https://community.cartalk.com/t/1999-lexus-gs400-no-ac-or-heat-blowing/136280/2 "2019-03-11T16:45:42Z")
Turn the ignition on. Set the blower speed to high. Reach under the passenger side of the dash, and with a handle of a screwdriver rap on the blower motor. If the blower starts working, replace the blower motor. Tester ---
**Author:** ![johnnytoomsq\_149328](https://avatars.discourse-cdn.com/v4/letter/j/edb3f5/32.png) [@johnnytoomsq\_149328](https://community.cartalk.com/u/johnnytoomsq_149328)\ **Post date:** [March 11, 2019, 4:47pm UTC](https://community.cartalk.com/t/1999-lexus-gs400-no-ac-or-heat-blowing/136280/3 "2019-03-11T16:47:10Z")
I tried that, it did not work, I also tapped on the resistor no dice either. ---
**Author:** ![johnnytoomsq\_149328](https://avatars.discourse-cdn.com/v4/letter/j/edb3f5/32.png) [@johnnytoomsq\_149328](https://community.cartalk.com/u/johnnytoomsq_149328)\ **Post date:** [March 11, 2019, 4:49pm UTC](https://community.cartalk.com/t/1999-lexus-gs400-no-ac-or-heat-blowing/136280/4 "2019-03-11T16:49:29Z")
It literally was blowing great before i updated the fuses listed above. ---
**Author:** ![shanonia](https://avatars.discourse-cdn.com/v4/letter/s/9de053/32.png) [@shanonia](https://community.cartalk.com/u/shanonia)\ **Post date:** [March 11, 2019, 4:50pm UTC](https://community.cartalk.com/t/1999-lexus-gs400-no-ac-or-heat-blowing/136280/5 "2019-03-11T16:50:29Z")
Try to get 12V directly to the blower motor (bypassing the switch and the resistor) and see if the motor runs. If so, the switch or resistor are suspect. If not, a new or good used motor is called for. ---
**Author:** ![johnnytoomsq\_149328](https://avatars.discourse-cdn.com/v4/letter/j/edb3f5/32.png) [@johnnytoomsq\_149328](https://community.cartalk.com/u/johnnytoomsq_149328)\ **Post date:** [March 11, 2019, 4:51pm UTC](https://community.cartalk.com/t/1999-lexus-gs400-no-ac-or-heat-blowing/136280/6 "2019-03-11T16:51:18Z")
I know this sounds stupid, but what exactly does that mean? I’m not real car smart. ---
**Author:** ![tcmichnorth](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/tcmichnorth/32/25126_2.png) [@tcmichnorth](https://community.cartalk.com/u/tcmichnorth)\ **Post date:** [March 11, 2019, 8:55pm UTC](https://community.cartalk.com/t/1999-lexus-gs400-no-ac-or-heat-blowing/136280/7 "2019-03-11T20:55:36Z")
Doesn’t sound stupid, but either bring it to a mechanic, he can test it, or if you know someone who works on cars they may be able to help. ---
**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:** [March 11, 2019, 11:49pm UTC](https://community.cartalk.com/t/1999-lexus-gs400-no-ac-or-heat-blowing/136280/8 "2019-03-11T23:49:24Z")
Check fuse # **9; heater** , it is in the same row as the radio fuse # 12. Fuse # 9 powers the relay that supplies power to the blower module. ---
**Author:** ![eddo](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/eddo/32/2594_2.png) [@eddo](https://community.cartalk.com/u/eddo)\ **Post date:** [March 12, 2019, 4:51pm UTC](https://community.cartalk.com/t/1999-lexus-gs400-no-ac-or-heat-blowing/136280/9 "2019-03-12T16:51:40Z")
> [@Nevada\_545](#): > > Check fuse # **9; heater** , it is in the same row as the radio fuse # 12. > > Fuse # 9 powers the relay that supplies power to the blower module. yep- recheck the fuses. Make sure it is in correctly, make sure you didn’t blow it, and then proceed. From your description, it sounds like the a/c switches are working fine (as the change in engine sounds likely means the a/c compressor is engaging,) so this is just a blower issue. ---
**Author:** ![johnnytoomsq\_149328](https://avatars.discourse-cdn.com/v4/letter/j/edb3f5/32.png) [@johnnytoomsq\_149328](https://community.cartalk.com/u/johnnytoomsq_149328)\ **Post date:** [March 12, 2019, 6:00pm UTC](https://community.cartalk.com/t/1999-lexus-gs400-no-ac-or-heat-blowing/136280/10 "2019-03-12T18:00:31Z")
Would fuse 9 be on passenger or driver side? I have fuses on both sides plus under hood. ---
**Author:** ![johnnytoomsq\_149328](https://avatars.discourse-cdn.com/v4/letter/j/edb3f5/32.png) [@johnnytoomsq\_149328](https://community.cartalk.com/u/johnnytoomsq_149328)\ **Post date:** [March 12, 2019, 6:02pm UTC](https://community.cartalk.com/t/1999-lexus-gs400-no-ac-or-heat-blowing/136280/11 "2019-03-12T18:02:55Z")
If its not the fuses does this mean blower motor or resistor? I’m just having a hard time thinking one of those happened simply after changing fuses lol but then again I’m the worst person to try to work in cars. ---
**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:** [March 12, 2019, 6:05pm UTC](https://community.cartalk.com/t/1999-lexus-gs400-no-ac-or-heat-blowing/136280/12 "2019-03-12T18:05:11Z")
Fuse #9 is in the drivers side fuse block. In which fuse block did you replace fuses? ---
**Author:** ![johnnytoomsq\_149328](https://avatars.discourse-cdn.com/v4/letter/j/edb3f5/32.png) [@johnnytoomsq\_149328](https://community.cartalk.com/u/johnnytoomsq_149328)\ **Post date:** [March 12, 2019, 6:07pm UTC](https://community.cartalk.com/t/1999-lexus-gs400-no-ac-or-heat-blowing/136280/13 "2019-03-12T18:07:45Z")
I checked and replaced it just now, didnt work. I only replaced fuses on passenger side and under hood. 5-30 amp fuses only ---
**Author:** ![johnnytoomsq\_149328](https://avatars.discourse-cdn.com/v4/letter/j/edb3f5/32.png) [@johnnytoomsq\_149328](https://community.cartalk.com/u/johnnytoomsq_149328)\ **Post date:** [March 12, 2019, 7:58pm UTC](https://community.cartalk.com/t/1999-lexus-gs400-no-ac-or-heat-blowing/136280/14 "2019-03-12T19:58:13Z")
Any other suggestions? ---
**Author:** ![tcmichnorth](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/tcmichnorth/32/25126_2.png) [@tcmichnorth](https://community.cartalk.com/u/tcmichnorth)\ **Post date:** [March 12, 2019, 9:07pm UTC](https://community.cartalk.com/t/1999-lexus-gs400-no-ac-or-heat-blowing/136280/15 "2019-03-12T21:07:20Z")
> [@shanonia](#): > > Try to get 12V directly to the blower motor (bypassing the switch and the resistor) and see if the motor runs. If so, the switch or resistor are suspect. If not, a new or good used motor is called for. > [@tcmichnorth](#): > > either bring it to a mechanic, he can test it, or if you know someone who works on cars they may be able to help. Looks like this is your next step. ---
**Author:** ![johnnytoomsq\_149328](https://avatars.discourse-cdn.com/v4/letter/j/edb3f5/32.png) [@johnnytoomsq\_149328](https://community.cartalk.com/u/johnnytoomsq_149328)\ **Post date:** [March 12, 2019, 10:34pm UTC](https://community.cartalk.com/t/1999-lexus-gs400-no-ac-or-heat-blowing/136280/16 "2019-03-12T22:34:53Z")
Unfortunately. Thanks for trying to help everyone. ---
**Author:** ![johnnytoomsq\_149328](https://avatars.discourse-cdn.com/v4/letter/j/edb3f5/32.png) [@johnnytoomsq\_149328](https://community.cartalk.com/u/johnnytoomsq_149328)\ **Post date:** [March 14, 2019, 11:59pm UTC](https://community.cartalk.com/t/1999-lexus-gs400-no-ac-or-heat-blowing/136280/17 "2019-03-14T23:59:23Z")
Hi everyone. The dealership literally gave up and couldnt figure out the issue. Blower motor is good, resistor is good, servo is good, compressor kicking on, heater fuse and blower motor relay good. I have no idea what to do at this point, im very frustrated. All of this just because i changed fuses so my inside lights would work