Howdy folks.
I read gadget's sticky before posting!
Last night I noticed that if I did over 65 or so the HVAC would do what it's designed to do in failure mode: go to the mix position. I typically do 75-85mph whenever possible. It's probably been doing this but this was first time I drove car on the expressway in shorts, so I could feel the difference on my legs and then air flow out of the defrost register. Take my foot off gas to make more vacuum, all is normal. But, when I go back to 80 it goes back to the mix position shortly after. Is that just normal for 80 mph or extended acceleration? These things have no balls at that speed and my foot feels like it's at least halfway into the gas pedal so I can't imagine it's making much vacuum... I also noticed it this morning driving into work but that's probably because I'm aware there's a potential issue now.
I want to know if it's normal for the system to do this before I start probing for problems. I want to say it isn't, but you guys know better than me. Within the last three weeks I replaced my TBL switch with a Motorcraft one and have been enjoying floor heat ever since. Before then I was just using the mix (floor/defrost) setting or the vent position. Never noticed any issues then. Also, I haven't been driving the car that much since I swapped over the switch, too much saltyness on the streets for my liking. Sticky says to check the switch, soup can, check valve or the line. I do have a vacuum pump and I suspect the TBL as that's what was changed recently. How do I test that, cover one of the nipples while trying to apply vacuum to the other?
Thanks fellas,
Derek
I read gadget's sticky before posting!
Last night I noticed that if I did over 65 or so the HVAC would do what it's designed to do in failure mode: go to the mix position. I typically do 75-85mph whenever possible. It's probably been doing this but this was first time I drove car on the expressway in shorts, so I could feel the difference on my legs and then air flow out of the defrost register. Take my foot off gas to make more vacuum, all is normal. But, when I go back to 80 it goes back to the mix position shortly after. Is that just normal for 80 mph or extended acceleration? These things have no balls at that speed and my foot feels like it's at least halfway into the gas pedal so I can't imagine it's making much vacuum... I also noticed it this morning driving into work but that's probably because I'm aware there's a potential issue now.
I want to know if it's normal for the system to do this before I start probing for problems. I want to say it isn't, but you guys know better than me. Within the last three weeks I replaced my TBL switch with a Motorcraft one and have been enjoying floor heat ever since. Before then I was just using the mix (floor/defrost) setting or the vent position. Never noticed any issues then. Also, I haven't been driving the car that much since I swapped over the switch, too much saltyness on the streets for my liking. Sticky says to check the switch, soup can, check valve or the line. I do have a vacuum pump and I suspect the TBL as that's what was changed recently. How do I test that, cover one of the nipples while trying to apply vacuum to the other?
Thanks fellas,
Derek
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