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Old 09-01-2011, 07:46 AM   #1
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Heater question (Blower)

(97 Jeep TJ) This morning I was out early (6 AM) no top, no doors - so it was cool. I turned on the heat.

Had the fan blowing and the temp (slider) over on hot - but little to no air was blowing down at my feet. As I slid the temperture over towards cool, I noticed the volume of air blowing toward my feet increased - if I slid the temp over toward the warmer to hot - the air flow decreased at my feet and started blowing out more on the defroster/defogger area of the dash.

When I slid the blower control to the dash or defroster - high volume of air came out those ports. But when I switched it back to blowing at my feet - little to no air volume.

Any ideas??

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Old 09-01-2011, 10:57 AM   #2
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If memory serves me, our 97 4.0, has a cable for hot/cold door, rest is vacuum controlled.

First check for a vacuum leak. Main line runs from intake, tees off at the center of the cowl (to feed your controls) then continues on to the vacuum tank under the battery.

Cracked line or leaking tank will cause poor control functions.

Other then that, it's look under the dash to see if maybe one of the linkages came off the vacuum motors that operate the other doors, or the door linkage broke, or a vacuum line came off/broke inside. Also the switch itself may have gone bad.

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Old 09-03-2011, 09:05 AM   #3
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speaking of heater/ac speeds, as far as the speed control in the dash of the 98 jeep is concerned....there are 4 dots on the speed control, ive owned my 98 for 10 years now and ive never had any blowing from the 1st dot on the speed control switch,has there always been a problem here or is that 1st dot an off position?
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