heat only luke warm when outside temp is below 30 deg.

Asked by Mar 06, 2014 at 02:49 PM about the 1999 Jeep Grand Cherokee Limited 4WD

Question type: Maintenance & Repair

have already replaced the blend doors. they were broken.  they are working properly now. heater core good. new radiator. engine temp 210 deg f. if I pull it in my garage, maybe 50 deg or so heat will work very well. any ideas? thanks

10 Answers

78,565

Recheck the travel of the blend doors, make sure they make the full travel then check the recirc door, the recirc doors are also a high fail on these.

I have recirc door tie strapped closed. basically the position it would be in if recirc was turned off. have taken back off and rechecked circ doors.

78,565

So there is your problem, you are pulling in cold outside air instead of blending it with warmer cab air, it should be locked in the recirc position and if you have a problem with the windows fog turn on the A/C to defogger the windows.

thanks for your insight. I tried it the other way a couple months ago and the windows did fog. AC wasn't working at that time. I have fixed since. My thought process for closing the recirc so the windows didn't fog was that I never turn on recirc in my truck or my 04 grand Cherokee or any other vehicle unless hot day with AC on so I was assuming that all those recirc doors were in the same position that I tie strapped the '99 GC recirc in. Am I thinking correctly? Thanks for your thoughts on this matter.

78,565

On a normal system your thinking would be right but as this is an HVAC system the recirc system is suppose to blend both cab and outside air to aid in cooling and heating. I don't why they just couldn't leave things along the old cable drive worked just as good if not better.

1 out of 1 people think this is helpful.

Your explanation definitely makes a lot of sense. I guess I'm just confused why I don't have to use the recirc button on my other vehicles that are equipped with recirc. Do they move automatically to different positions when you don't have the button on? I really appreciate all the time you have taken to explain this to me. thanks,

78,565

If your other have HVAC system then yes they do.

1 out of 1 people think this is helpful.
Best Answer

My other cars do have the recirc button. This makes a lot of sense now. I always thought the door was full open or full closed. Never knew it actually opened some and mixed on its own. Your answers were great and really appreciated. What do you think if I were to drill a few 1/4" or so dia holes in the recirc door before I wire tie it to the fire wall side so that it will let a little fresh air in and maybe not fog as much? thanks

78,565

That would work if you live in a high humidity area it would help.

1 out of 1 people think this is helpful.

Thank you for all your help. I will let you know how it works out.

Your Answer

Add photo

Related Questions

Grand Cherokee

Looking for a Used Grand Cherokee in your area?

CarGurus has 71,084 nationwide Grand Cherokee listings starting at $495.

ZIP:

Search Jeep Grand Cherokee Questions

Jeep Grand Cherokee Experts

#1 inuevafreak
inuevafreak
Reputation 1,850
#2 Tom Demyan
Tom Demyan
Reputation 1,640
#3 thejeepdoctor
thejeepdoctor
Reputation 1,490
View All

Related Models For Sale

Used Jeep Cherokee
371 Great Deals out of 54,961 listings starting at $2,495
Used Ford Explorer
1,504 Great Deals out of 74,211 listings starting at $985
Used Jeep Wrangler
521 Great Deals out of 17,733 listings starting at $2,990
Used Toyota 4Runner
426 Great Deals out of 20,864 listings starting at $2,499
Used Chevrolet Tahoe
1,083 Great Deals out of 32,097 listings starting at $1,495
Used Dodge Durango
477 Great Deals out of 23,475 listings starting at $950
Used Ford F-150
3,485 Great Deals out of 207,573 listings starting at $1,273
Used BMW X5
619 Great Deals out of 17,222 listings starting at $2,788
Used Chevrolet Silverado 1500
2,761 Great Deals out of 150,217 listings starting at $1,259
Used Chevrolet Camaro
631 Great Deals out of 39,686 listings starting at $2,995

Used Cars For Sale

2017 Jeep Grand Cherokee Limited 4WD For Sale
9,559 listings starting at $32,809
2016 Jeep Grand Cherokee Limited 4WD For Sale
6 Great Deals out of 2,196 listings starting at $30,740
2015 Jeep Grand Cherokee Limited 4WD For Sale
89 Great Deals out of 1,965 listings starting at $23,977
2014 Jeep Grand Cherokee Limited 4WD For Sale
94 Great Deals out of 2,581 listings starting at $17,777
2013 Jeep Grand Cherokee Limited 4WD For Sale
18 Great Deals out of 232 listings starting at $15,500