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No rear heat? (front works fine)

 
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porksoda



Joined: 31 Mar 2014
Posts: 204
Location: Clovis,NM

PostPosted: Fri Jan 01, 2016 9:03 pm    Post subject: No rear heat? (front works fine) Reply with quote

I am having an issue with my rear heat.
My front vents blow out nice hot air, but the rear only blows out cold.
I know the rear used to blow hot air out in the past. My daughter sits in the back and I am always driving. My wife decided to drive and I sat in the back for the first time in a long time and noticed it is only blowing cold. I checked to make sure that all controls are on heat, but still blowing cold.

Any suggestions would be appreciated!
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2006 Nissan Pathfinder SE Offroad 4x4
Engine: 4.0L
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Joined: 13 Aug 2008
Posts: 2756
Location: Winnipeg, Canada

PostPosted: Fri Jan 01, 2016 10:23 pm    Post subject: Reply with quote

Low coolant. Fill 'er up! Smile

I've had to do this twice over the past 5 yrs or so.
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Terry in Winnipeg

'05 Pathfinder SE Premium 4x4 - 343000kms (213000mi) - weekend warrior, Cortex Superchips on 87 Octane Tune, K&N filtercharger, Airlift 1000, Prodigy Brake controller, 7 pin trailer hookup, Prostart Remote Starter, Cooper Discoverer ATw P265/70/16
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porksoda



Joined: 31 Mar 2014
Posts: 204
Location: Clovis,NM

PostPosted: Fri Jan 01, 2016 10:52 pm    Post subject: Reply with quote

Well I went to check and the coolant level was just a hair lower then max. I went on ahead and filled it up a little more then max. I ran it for 30 mins and the front air was nice and hot but the rear was ice cold. I wonder what is the next step I should do. Maybe a pressurized coolant exchange?

I checked the radiator and it is full also.
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smj999smj
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Joined: 22 Jan 2012
Posts: 5435
Location: Prospect, VA

PostPosted: Sat Jan 02, 2016 4:46 am    Post subject: Reply with quote

Set all of the heaters to the maximum heat position, jack up the front end of the vehicle, and run the engine between 2000-3000 RPM for about 15-20 minutes until the rear heater blows hot. If that doesn't work, you may have a bad heater pump (located at the firewall and has two heater hoses connected to it) or possibly a bad mode door actuator on the rear heater unit.
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2006 Pathfinder LE VQ40DE AWD, aftermarket radiator, Airlift 1000's, Bilstein HD rear shocks, Doug Thorley shortie headers and mid-pipes, Magnaflow 12580 muffler, aFe Momentum GT CAI w/ dry filter, XTP plenum spacer, Superchips Flashpaq tuner
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porksoda



Joined: 31 Mar 2014
Posts: 204
Location: Clovis,NM

PostPosted: Sat Jan 02, 2016 5:46 am    Post subject: Reply with quote

smj999smj wrote:
Set all of the heaters to the maximum heat position, jack up the front end of the vehicle, and run the engine between 2000-3000 RPM for about 15-20 minutes until the rear heater blows hot. If that doesn't work, you may have a bad heater pump (located at the firewall and has two heater hoses connected to it) or possibly a bad mode door actuator on the rear heater unit.


With the vehicle lifted up and rps up do I leave any of the caps open(radiator or overflow tank)?
Thanks!
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skinny2
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Joined: 26 Dec 2009
Posts: 1531
Location: BFE, Ohio

PostPosted: Sat Jan 02, 2016 6:14 am    Post subject: Reply with quote

I've had this problem in the past and I park on a steep incline with the nose up (in lieu of jacking the front) and open the radiator cap (with a cold engine of course!!). Set the heat to max and let the engine warm up. Once the coolant starts flowing rev the engine as smj999smj stated. Some will spill out of the radiator but that seems to be part of the "burping" process. Then top off the tank and close everything up. Sometimes it will still blow luke-warm air to the back if you're idling or driving slowly, but once rolling the heat returns. I don't know if the pump is weak or what but it's been like this for years. Rear heat isn't a big enough deal for me to do any more than what I've done.
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smj999smj
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Joined: 22 Jan 2012
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Location: Prospect, VA

PostPosted: Sat Jan 02, 2016 12:33 pm    Post subject: Reply with quote

I leave the caps on. My friend has a 2004 Tiitan that had poor heating issues and he fixed it by replacing the heater pump and purging it the way I just explained in the earlier post.
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DanJetta



Joined: 03 Oct 2012
Posts: 478

PostPosted: Sat Jan 02, 2016 12:41 pm    Post subject: Reply with quote

Yep, I have to do this every year to get my rear heat to work for the winter.
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PostPosted: Sat Jan 02, 2016 9:25 pm    Post subject: Reply with quote

The only time I've bothered with ramps is when I drained the system totally. Otherwise, I've never had to do that to get rid of any air pockets. IMHO you should check the fluid level. If low, add some and see what happens. If the heat doesn't come back, try ramps to get more air out.
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Terry in Winnipeg

'05 Pathfinder SE Premium 4x4 - 343000kms (213000mi) - weekend warrior, Cortex Superchips on 87 Octane Tune, K&N filtercharger, Airlift 1000, Prodigy Brake controller, 7 pin trailer hookup, Prostart Remote Starter, Cooper Discoverer ATw P265/70/16
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