is it vaccum controlled on 99 jeep heating system/where is it located

Asked by Dec 30, 2012 at 12:25 PM about the 1999 Jeep Grand Cherokee Laredo 4WD

Question type: Maintenance & Repair

3 Answers

97,175

The temperature adjustment is electrical. The blend doors are vacuum. Do you have no heat or is it not going where you want it to?

2 of 2 people found this helpful.

i have no heat at all. flushed heater core and new thermostat. it has to be electrical or blend doors are not opening

97,175

I checked RockAuto.com and your Jeep has a blend door - not a valve in the heater hose. You can go there to see what it looks like. When it is shut, air goes through the heater core. When it opens, cold air goes around. Look at the picture, find the door and shut it for the winter. It could be vacuum. it could be electric that controls the door and you'll find that out when you locate the door.

2 of 2 people found this helpful.
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