Steve_RI Posted February 13, 2019 Share Posted February 13, 2019 What the heck is that rubber tube (about a 1/2 inch or so) that runs behind the center console. You can grab it if you remove the ashtray. The dam thing was whistling and driving me nuts. I didn't know what the heck it was until I took everything apart and squeezed that tube and it stopped. Sounds like a little fan in there? Link to comment Share on other sites More sharing options...
msavides Posted February 13, 2019 Share Posted February 13, 2019 It is the interrior temp sensor tube. it has a little fan in there that draws air from the cabin so it can get a reading. it is used when you put you ac or heater in the auto position. it will cycle your fan up or down as the temp you set is reached. 1 Link to comment Share on other sites More sharing options...
Slartibartfast Posted February 14, 2019 Share Posted February 14, 2019 ^Yup, what he said. Temp sensor for the auto aircon. The little grille on the HVAC panel (diagonal slots next to the A/C button) is where it draws air from, there's actually a suggestion in the service manual to check its operation by blowing cigarette smoke at that grate and seeing if it gets sucked in. IIRC the little fan in there runs whenever the truck is powered up, not just with the hvac in auto mode. It shouldn't be whistling, though. Sounds like the little fan in there might be on its way out, or there's something restricting the tube. Mine makes a slight ticking sound as the fan runs and that's it. I'm still not entirely sure what the point of the auto HVAC is, honestly. I preferred the simplicity of the manual HVAC in my '95. 1 Link to comment Share on other sites More sharing options...
Steve_RI Posted February 14, 2019 Author Share Posted February 14, 2019 Thanks for the info, I had no idea about that. I will disable it as I never use the auto setting anyway. Link to comment Share on other sites More sharing options...
adamzan Posted February 14, 2019 Share Posted February 14, 2019 Slart if you want to trade I'll send you a fully working perfect condition manual setup... Link to comment Share on other sites More sharing options...
Slartibartfast Posted February 15, 2019 Share Posted February 15, 2019 Tempting! I'll have to take a long hard look at my dashboard and decide if I really want to pull it all apart again. It was so much fun the last time. 1 Link to comment Share on other sites More sharing options...
adamzan Posted February 15, 2019 Share Posted February 15, 2019 I don't think you have to pull the whole thing, probably just the lower parts around the steering, and the glove box, and the radio. Link to comment Share on other sites More sharing options...
Slartibartfast Posted February 16, 2019 Share Posted February 16, 2019 Interesting. I'll have to take a closer look. I should probably pull the dash anyway, I think I've still got fluff in the vents from when the mice got in because it doesn't blow nearly as hard as it should. 1 Link to comment Share on other sites More sharing options...
msavides Posted March 18, 2019 Share Posted March 18, 2019 how much work is it to swap from a manual setup to the auto setup. my 1991 SE has the auto fan control. the 1994 SE does not. . not sure if it is worth the work Link to comment Share on other sites More sharing options...
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