Heater control vacuum leak
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Heater control vacuum leak
Okay so here is my issue, when i start driving my 00 cherokee every so often ill get a loud whistle whining noise. It sounds like its inside the dash but the other day when i popped the hood i heard it even louder in the engine bay. I also noticed that im having another issue where my heater controls only work really when on 4. 1-3 dont really do much of anything. I popped apart the dash and checked the vaccums behind the controls are fine and the colored tubes going to the plug behind glove box is fine. Could they e popped off somewhere else? Where do i look. Where do i start? Sound like somethin in engine bay is popped? Jeep seems to idle a little rough too
#2
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Get a can of carb cleaner and go spray the whole engine bay (systematically).
When idle changes momentarily, you have localised the (or a) vacuum leak.
When idle changes momentarily, you have localised the (or a) vacuum leak.
#4
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Controls are vacuum operated IIRC, whistling could be the 'false' air being sucked in.
Blower motor is on the list.
Blower motor is on the list.
Last edited by Roler; 11-11-2013 at 08:13 AM.
#5
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Year: 1999
Model: Cherokee
Engine: 4.0
Okay so here is my issue, when i start driving my 00 cherokee every so often ill get a loud whistle whining noise. It sounds like its inside the dash but the other day when i popped the hood i heard it even louder in the engine bay. I also noticed that im having another issue where my heater controls only work really when on 4. 1-3 dont really do much of anything. I popped apart the dash and checked the vaccums behind the controls are fine and the colored tubes going to the plug behind glove box is fine. Could they e popped off somewhere else? Where do i look. Where do i start? Sound like somethin in engine bay is popped? Jeep seems to idle a little rough too
The vacuum tube continues past the cruise control servo and goes to a vacuum reservoir behind the right front bumper end cap. Occasionally the tube will break or chafe through behind the battery.
You can view the vacuum tube connection at the vacuum resrvoir by laying on your back with your head under the right front bumper end cap, pull the right wheel well liner back enough to look up and, using a flashlight, look to see if the reservoir tube connection has come loose.
#7
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The loud whistle sounds like a vacuum leak. But the heater controls sound like a different issue. When you say 1-3 don't do anything and only 4 works, are you refering to the fan speed? That is likely a blower motor resistor.
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#8
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I looked under the headlight to thay resevoir and has not come loose. If i spray carb cleaner on these vaccum connections while running will the idle change when i find the leak? And what bout these heater
Controls
Controls
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Year: 1999
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If it's whistling that loud it's a pretty good leak. Do the visual inspections I outlined in post #5 before using a fire starter to look for the leak.
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I don't recommend duesching down the engine bay with carb cleaner. There's too many plastic and rubber items (let alone painted items) in the engine bay that will be affected by it. If anything, use an unlit Propane tourch to probe around with.
If it's whistling that loud it's a pretty good leak. Do the visual inspections I outlined in post #5 before using a fire starter to look for the leak.
If it's whistling that loud it's a pretty good leak. Do the visual inspections I outlined in post #5 before using a fire starter to look for the leak.
#15
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Seriously, we can argue about everything here. I'm not talking about doushing down the engine bay. I'm talking about little sprays of fine carb cleaner mist.....jeez. Many have tried this, please. I assume some common since here CC.
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