Some random questions.

Reply Subscribe

Thread Tools

Search this Thread

Nov 9, 2014 | 02:56 PM

#16

cruiser54

::CF Moderator::

Joined: Aug 2011

Posts: 43,971

Likes: 1,579

From: Prescott, Az

Year: 1990

Model: Cherokee (XJ)

Engine: 4.0

Quote:

Originally Posted by 1991Jeep_Man

Yes sir!

Hiw exactly does this mod work? I am very curious.

It keeps the flutes from picking up oil spray off of the valve train.

Nov 9, 2014 | 05:05 PM

#17

salad

Herp Derp Jerp

Joined: Nov 2011

Posts: 18,251

Likes: 17

From: Parham, ON

Year: 1999

Model: Cherokee

Engine: 4.0L OBD-II

Quote:

Originally Posted by CCKen

I'm working on putting an AC isolation switch in my '99. Currently I just unplug the AC Low Pressure Cycling Switch connector on top of the Accumulator.]

No need. Install a switch in the HVAC panel to interrupt the A/C Request signal to the PCM. Works great! I've got bilev and warm defrost in my '99.

Pin 5 or something of the '97+ HVAC panel connector.

Mister OP you can probably use the same idea on your 1991. If it works the same way as later years of course.

Nov 9, 2014 | 06:33 PM

#18

1991Jeep_Man

Thread Starter

CF Veteran

Joined: Oct 2009

Posts: 2,867

Likes: 16

From: Fauquier County, Virginia

Year: 1991

Model: Cherokee

Engine: I-6 4.0 HO

Quote:

Originally Posted by cruiser54

It keeps the flutes from picking up oil spray off of the valve train.

Cool deal, and makes sense. So on both flutes, trim 1 inch off and then drill a 1/2" hole on the rear flute near the top facing to the rear? Or a hole in both flutes?

Thanks again Cruiser!

Quote:

Originally Posted by salad

Sounds good. I'm going to hunt around for a diagram some more. Worst case, I'll just pull the HVAC control out enough to use a multimeter and find which wire gives signal when the defrost/ac settings are selected.

By chance, anyone know exactly what the 'Heat' option is for in the Pre-97 XJ's? It goes to the floor vents.

Nov 9, 2014 | 09:24 PM

#19

cruiser54

::CF Moderator::

Joined: Aug 2011

Posts: 43,971

Likes: 1,579

From: Prescott, Az

Year: 1990

Model: Cherokee (XJ)

Engine: 4.0

Quote:

Originally Posted by 1991Jeep_Man

Cool deal, and makes sense. So on both flutes, trim 1 inch off and then drill a 1/2" hole on the rear flute near the top facing to the rear? Or a hole in both flutes?

Thanks again Cruiser!

Sounds good. I'm going to hunt around for a diagram some more. Worst case, I'll just pull the HVAC control out enough to use a multimeter and find which wire gives signal when the defrost/ac settings are selected.

By chance, anyone know exactly what the 'Heat' option is for in the Pre-97 XJ's? It goes to the floor vents.

Yeppurs on my end.

Nov 9, 2014 | 09:27 PM

#20

DFlintstone

CF Veteran

Joined: Aug 2011

Posts: 10,489

Likes: 24

From: Nor-Cal Coast

Year: 90,84

Model: Cherokee

Engine: 4.0,2.5

Quote:

Originally Posted by 1991Jeep_Man

C then drill a 1/2" hole on the rear flute near the top facing to the rear? Or a hole in both flutes?

Let's see pics!

Nov 9, 2014 | 09:28 PM

#21

cruiser54

::CF Moderator::

Joined: Aug 2011

Posts: 43,971

Likes: 1,579

From: Prescott, Az

Year: 1990

Model: Cherokee (XJ)

Engine: 4.0

Quote:

Originally Posted by DFlintstone

Let's see pics!

They're in the link................

Nov 9, 2014 | 09:52 PM

#22

DFlintstone

CF Veteran

Joined: Aug 2011

Posts: 10,489

Likes: 24

From: Nor-Cal Coast

Year: 90,84

Model: Cherokee

Engine: 4.0,2.5

I needed to copy and paste your "images", (couldn't just click), didn't find it there. But a few of mine! Then in #25, there is a link on the bottom, "to view full image", but it didn't open or me.

Maybe my thing, but I AM on high-speed or a change....