2 problems with my xj - AC and electric - JeepForum.com

 
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post #1 of 4 Old 10-09-2013, 11:20 PM Thread Starter
Radney
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1997 XJ Cherokee 
 
Join Date: Jul 2010
Location: Baton Rouge
Posts: 48
2 problems with my xj - AC and electric

Problem 1 - Have a '97 and the AC blows really cold but rafter driving for a while the air will randomly switch to the defrost vent or other places (without touching the switch). Occasionally it will just stop blowing much air altogether.


Problem 2 - driving at night I noticed the lights inside and out started to pulse like they had a heartbeat. Bad alternator?

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post #2 of 4 Old 10-10-2013, 02:59 AM
Holder350
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1995 XJ Cherokee 
 
Join Date: Oct 2007
Location: Whitesburg
Posts: 5,293
#1 you have a vacuum leak in your HVAC system.

With no vacuum to move the blend doors the xj's system will go to defrost.

#2 The lights pulsing could be as simple as a grounding issue on the motor.

Check the alternator bolts and make sure they are tight. If so make sure your grounding strap from the firewall to the back of the head is there and tight.

Sent from my phone where correct grammar is difficult.

95' XJ Country - Stock Skids - D30/D35 Limited Slip - 3" Lift - 31x10.50R15 - 4.0 HO - AX15 - NP231

98' XJ Classic - D30/C8.25 - 4.5" RC Lift - 33x12.50R15 - 4.0 HO - AW4 - NP231
Quote:
Originally Posted by Azzy View Post
You can tell the character of a person in how they treat someone who can do nothing for them.
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post #3 of 4 Old 10-10-2013, 03:10 AM Thread Starter
Radney
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1997 XJ Cherokee 
 
Join Date: Jul 2010
Location: Baton Rouge
Posts: 48
How can I find a vacuum leak in the HVAC?
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post #4 of 4 Old 10-10-2013, 05:56 AM
Holder350
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1995 XJ Cherokee 
 
Join Date: Oct 2007
Location: Whitesburg
Posts: 5,293
Best and easiest way is to use a smoke machine to pump smoke into the lines. Where the smoke comes out there is a leak.

Other than that searching all the lines looking for it.

http://www.jeepforum.com/forum/f11/only-default-defrost-vents-work-1554810/

Make sure you check the vacuum ball on the front bumper. They are known to crack.

Sent from my phone where correct grammar is difficult.

95' XJ Country - Stock Skids - D30/D35 Limited Slip - 3" Lift - 31x10.50R15 - 4.0 HO - AX15 - NP231

98' XJ Classic - D30/C8.25 - 4.5" RC Lift - 33x12.50R15 - 4.0 HO - AW4 - NP231
Quote:
Originally Posted by Azzy View Post
You can tell the character of a person in how they treat someone who can do nothing for them.
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