Why is my voltage dropping when air is on but when its off it overcharges.alt was tested good 770 cca and 15v. Also air and heat only comes thru defrost vent not main vents checked every switch

99 xj sport

 

That's awesome haha

 

http://teamcherokee.com/jeep-emblem-...kee-1997-2001/

 

Thanks, Turbo.

 

I got an 89 XJ with exactly the same problem . I was told the ac issue was lack of vacuum but I have Vacuum all the way back up to firewall I changed out the AC/heater control switch panel and still have same issue .

 

Is the only place to get a fuel pressure regulator for a 96 the junkyard? I did some searching and couldn't find anything. One place had a complete fuel pump assembly for $700!! Maybe swap it for a newer year setup?

 

Are you trusting the dash gauge or using a meter at the battery?

Use a meter and post up the voltage readings.

 

You two need to look at this diagram.

Keep in mind you WILL most likely have vacuum at idle. It goes away when accelerating if there's an issue in the vacuum system.

As for the 99, some of your vents may be controlled electronically.

 

It was 15 and 770cca ,I was told when tested

 

CCA is the rating of a battery.

Buy a $5 meter and check this stuff yourself.

 

Is the stock radiator single or dual row?

 

How would I know there is the radiator and then something smaller in front.would that be dual. I fixed my air vents btw

 

IIRC its single

 

The one infront is the ac condensor

 

then the trans cooler