1998 Grand Cherokee Defrost Only and No Cruise - Jeep Garage - Jeep Forum

Go Back   Jeep Garage - Jeep Forum > Jeep Platform Discussion > Grand Cherokee - ZJ

Reply
 
Thread Tools Display Modes
 
  #1  
Old 01-27-2016, 06:17 PM
Member
 
Join Date: Nov 2015
Posts: 12
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 595
lordgrape is on a distinguished road
1998 Grand Cherokee Defrost Only and No Cruise

So, I know there's tons of posts about this subject and I've read them all. Here's my situation. I've checked all the vacuum lines in the engine compartment and put a vacuum checker on the line coming from the intake and it held pressure. I've put the vacuum checker on the line going into the cab from the engine compartment and it holds pressure. I've checked the vacuum reservoir and it holds pressure. I've taken the vacuum connector off the back of the A/C and heat control panel and put pressure into each of the vacuum lines and they all hold pressure.
I'm at a loss of why my vent system only blows through the defrost. Also, my cruise doesn't work. So this tells me it is a vacuum issue, but I can't find anywhere it could be losing vacuum from for these two systems. I thought maybe the control panel is bad but would that cause the cruise to not work also?
Any ideas or suggestions would be appreciated!

Reply With Quote
Sponsored Links
Advertisement
 
  #2  
Old 01-28-2016, 07:22 AM
Frango100's Avatar
The beast from Brazil

My Jeep: 2004 4.7L WJ
 
Join Date: Dec 2009
Location: Brazil
Posts: 7,613
Thanks: 23
Thanked 423 Times in 408 Posts
Rep Power: 529930
Frango100 has a reputation beyond reputeFrango100 has a reputation beyond reputeFrango100 has a reputation beyond reputeFrango100 has a reputation beyond reputeFrango100 has a reputation beyond reputeFrango100 has a reputation beyond reputeFrango100 has a reputation beyond reputeFrango100 has a reputation beyond reputeFrango100 has a reputation beyond reputeFrango100 has a reputation beyond reputeFrango100 has a reputation beyond repute
Re: 1998 Grand Cherokee Defrost Only and No Cruise

Did you check if there is vacuum in the line when the engine runs? Could be some clogged line.
__________________
Frank

JEEP Grand Cherokee 4.7 Lmtd 2004
HID 8000K in low and fog / Quad Squad member
KYB Gas-a-Just shocks / Pirelli Scorpion ATR 245/65/17 - Transgo reprogramming shiftkit.

VW Beetle 2.0 TSI 2013
My new toy
Reply With Quote
  #3  
Old 01-28-2016, 10:04 AM
Member
 
Join Date: Nov 2015
Posts: 12
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 595
lordgrape is on a distinguished road
Re: 1998 Grand Cherokee Defrost Only and No Cruise

That's my next step. Going to grab a vacuum tester today. I did start the Jeep and pull off the vacuum line from the intake and there seems to be good flow, but a gauge at various locations should tell the tale better.
Reply With Quote
Sponsored Links
Advertisement
 
  #4  
Old 01-28-2016, 12:05 PM
Member
My Jeep: 2006 5.7L WK
 
Join Date: Jan 2016
Location: minnesota
Posts: 227
Thanks: 7
Thanked 15 Times in 14 Posts
Rep Power: 759
dallas1 is on a distinguished road
Re: 1998 Grand Cherokee Defrost Only and No Cruise

There is a valve lays by top of manifold called a check valve, if you got to dealer it is in the cruise control section when they look up the part ,I don't think you can get the part at a local store dealer item this happen in my 98 grand cherokee 5.2
Reply With Quote
  #5  
Old 01-28-2016, 01:28 PM
Member
 
Join Date: Nov 2015
Posts: 12
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 595
lordgrape is on a distinguished road
Re: 1998 Grand Cherokee Defrost Only and No Cruise

You talking the one that is in line just after the vacuum line leaves the intake? I've checked that one and it is operating correctly.
Reply With Quote
  #6  
Old 01-28-2016, 01:32 PM
Member
My Jeep: 2006 5.7L WK
 
Join Date: Jan 2016
Location: minnesota
Posts: 227
Thanks: 7
Thanked 15 Times in 14 Posts
Rep Power: 759
dallas1 is on a distinguished road
Re: 1998 Grand Cherokee Defrost Only and No Cruise

Yep that's the one ok, dang thought it would help
Reply With Quote
  #7  
Old 01-28-2016, 05:00 PM
Member
 
Join Date: Nov 2015
Posts: 12
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 595
lordgrape is on a distinguished road
Re: 1998 Grand Cherokee Defrost Only and No Cruise

Well dang! I rechecked that check valve after I got the vacuum tester and sure enough, good pressure coming off the manifold and no pressure after the valve! Stupid I didn't find it earlier, nut at least it's fixed now! Straight-lined, no valve installed. Anyone know where I can get a replacement check valve?
Reply With Quote
  #8  
Old 01-28-2016, 05:06 PM
Member
My Jeep: 2006 5.7L WK
 
Join Date: Jan 2016
Location: minnesota
Posts: 227
Thanks: 7
Thanked 15 Times in 14 Posts
Rep Power: 759
dallas1 is on a distinguished road
Re: 1998 Grand Cherokee Defrost Only and No Cruise

I had to get mine at the dealer, when the look it up on the parts diagram it is in cruise control section.
Reply With Quote
  #9  
Old 01-28-2016, 07:12 PM
Member
 
Join Date: Nov 2015
Posts: 12
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 595
lordgrape is on a distinguished road
Re: 1998 Grand Cherokee Defrost Only and No Cruise

Looks like Napa has it for $17.99! For those wondering the part number, OEM part number is: 4306923.
Hope this helps someone else also!
Reply With Quote
  #10  
Old 01-28-2016, 08:01 PM
Member
My Jeep: 2006 5.7L WK
 
Join Date: Jan 2016
Location: minnesota
Posts: 227
Thanks: 7
Thanked 15 Times in 14 Posts
Rep Power: 759
dallas1 is on a distinguished road
Re: 1998 Grand Cherokee Defrost Only and No Cruise

Cool.that is a fair price
Reply With Quote
  #11  
Old 01-28-2016, 08:25 PM
Member
 
Join Date: Nov 2015
Posts: 12
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 595
lordgrape is on a distinguished road
Re: 1998 Grand Cherokee Defrost Only and No Cruise

The replacement is smaller diameter though. I'll post how it works out when I install it.
Reply With Quote
  #12  
Old 01-28-2016, 08:50 PM
Member
My Jeep: 2006 5.7L WK
 
Join Date: Jan 2016
Location: minnesota
Posts: 227
Thanks: 7
Thanked 15 Times in 14 Posts
Rep Power: 759
dallas1 is on a distinguished road
Re: 1998 Grand Cherokee Defrost Only and No Cruise

Mine from the dealer was the same ,a little smaller
Reply With Quote
Reply

Tags
grand cherokee

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Jeep Liberty no heat only on low and no defrost mculley Troubleshooting/Problems Discussion 0 10-26-2014 01:01 PM
Yet another defrost only question PeteG45 Troubleshooting/Problems 6 10-04-2014 01:15 AM
a/c only from defrost vents jrsummersill1 Troubleshooting/Problems 34 08-20-2012 12:58 PM
A/C only coming out of defrost vents DLStryker Troubleshooting/Problems 19 07-21-2010 03:26 AM

» Premium Vendor Showcase
Powered by vBadvanced CMPS v3.2.3

All times are GMT -5. The time now is 08:55 AM.


Powered by vBulletin® Version 3.8.8
Copyright ©2000 - 2017, vBulletin Solutions, Inc.
Copyright 2012 - JeepGarage.Org
The Jeep Grand Cherokee Owners Community

JeepGarage.org is in no way associated with or endorsed by FCA US LLC. Chrysler, Dodge, Jeep, Ram, Mopar and SRT are registered trademarks of FCA US LLC.