No rear heat....Any ideas??

renegade34 · #1 (**permalink**) 02-25-08, 11:29 PM

I have an '06 Escalade and the rear heat dosen't work.Only cold air comes from the rear vents when the heat is cranked.Any suggestions?

2caddyjoe · #2 (**permalink**) 02-26-08, 01:52 AM

Make sure that you have the overhead consol controls in the front are set aux if you are trying to use the rear controls. Other wise use the front to set the temp and blower.

renegade34 · #3 (**permalink**) 02-27-08, 02:03 AM

I tried that and the vents are blowing cold air even when it is cranked to heat.Any other ideas?Is the rear its own independant system? Ie.heater core, ect. or does it feed from the main (front) system?

silversport · #4 (**permalink**) 02-27-08, 08:35 AM

I have this same issue with my '00 Esky...are we sure there is a rear HEATER...a buddy that has a Suburban and a Tahoe both with rear air conditioning told me...it's only air...not heat...this could be the answer then...thought he was pulling my leg...
Bill

**hcvone** · #5 (**permalink**) 02-27-08, 09:44 AM

I am pretty sure that all 03's and probably 02's and up have both rear AC and rear heat.

renegade34 · #6 (**permalink**) 03-04-08, 12:31 AM

C'mon guys,somebody must be able to answer this.

250motorsportz · #7 (**permalink**) 03-04-08, 12:47 AM

I have the same problem, my 2nd and 3rd row used to get heat and then all of a sudden I tried to use it once and all that came out was cold air.

Max-Q · #8 (**permalink**) 03-04-08, 01:28 AM

I had the same problem with my 03. I don't have a clue as to how or why it started working again but believe or not it started immediately after I put in a new battery. I don't know if that had anything to do with it but it didn't work for almost an entire year then it worked the same day the battery was replaced.

I'm wondering if the rear heat is electric and maybe there wasn't enough juice to run the heater?

BIGTAIL · #9 (**permalink**) 03-28-09, 03:19 AM

I have the same issue - any thoughts on a fix? LAne

oldworld · #10 (**permalink**) 03-28-09, 09:29 AM

Obviously, there is rear air and HEAT. Anyway, I had a similar situation when I purchased my truck in the winter. IT WAS COLD AIR ONLY. Took it back to dealer and they told me it was a relay.
Someone else suggested here about a battery disconnect. That seems to set and reset alot of issues. Wonder if its a good idea to do that once in a while.

bigdady1285 · #11 (**permalink**) 10-12-09, 04:47 PM

I went to the dealer today for the sme issue and they told me that the Door Actuator and rear HVAC Control Module need to be replaced est. $505.00.

nathanjax · #12 (**permalink**) 10-12-09, 05:20 PM

Quote:

Originally Posted by bigdady1285

I went to the dealer today for the same issue and they told me that the Door Actuator and rear HVAC Control Module need to be replaced est. $505.00.

Change it yourself... (stealing pics from another site)

heres what the heating unit looks like. It's on the right side in the rear...

1- Hot/Cold actuator
2- Floor/Ceiling actuator
3- Control module #15832319 with the two blue clips

Looks like you need part #1

oldworld · #13 (**permalink**) 10-13-09, 08:36 AM

GREAT PICS as always!

bigdaddy's caddy · #14 (**permalink**) 10-13-09, 10:50 AM

I had the same problem with my 04 I reset the blend door acuators and it has work so far for me Turn the truck off In the under hood fuse panel there is a fuse marked HVAC/EACS pull this fuse for about 20 seconds Reinstall fuse and start up the truck do not touch the heater controls and the acuators should reset them selfs in a few mins. This is what i did and so far so good This is something to try befor replacing parts Hope this helps

KrazyKeith · #15 (**permalink**) 10-13-09, 12:20 PM

Quote:

Originally Posted by bigdaddy's caddy

I had the same problem with my 04 I reset the blend door acuators and it has work so far for me Turn the truck off In the under hood fuse panel there is a fuse marked HVAC/EACS pull this fuse for about 20 seconds Reinstall fuse and start up the truck do not touch the heater controls and the acuators should reset them selfs in a few mins. This is what i did and so far so good This is something to try befor replacing parts Hope this helps

I'm going to give this a try before pulling apart the truck to replace the actuator/s and or control mod. I would think its just the one actutor in my case. A reset may help though, worth a shot!