Blows cold air on idling

Amandeep Diagnostician Saskatchewan Posted   Latest   Edited  
Unsolved
HVAC
2015 Nissan Rogue Select S 2.5L (QR25DE) (RE0F10A)
No Heat On Idling

2015 nissan rouge no heat on idling​.​ when you driving heat start coming out from vent​.​ heat is good on high speed​.​ customer change waterpump, thermostat and we flushed heater core but problem still not resolved. Any suggestions.

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Wayne Owner/Technician
Ontario
Wayne
 

Follow the cooling system bleeding procedure outlined in a TSB. I have had quite a few in here with this issue. It is also very possible you need a heater core but the bleeding procedure by lifting the front end and burping the inlet outlet hoses does sometimes work. I use a vac system for all cooling systems but have still had an issues with some nissans.

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Jeff Technical Support Specialist
Washington
Jeff
 

You have an air pocket in the system. Get or make a non-pressurized radiator cap and raise the front end up to a point that the Radiator is higher than the heater core. Run at about 2000 rpm and cycle the heater between hot and cold. Give it some time. What you also might use is one of the funnel type coolant fill tools while doing this. Nissan always seems to have air pockets after servicing…

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Jordan Technician
Nevada
Jordan
 

Do you happen to remember the TSB? I did a little looking and haven't come across one yet. Thanks

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Wayne Owner/Technician
Ontario
Wayne
 

NTB02-047C is the one for the Altima/Maxima.. I can't find the one I read either… Basically the same thing… Good Luck

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Jordan Technician
Nevada
Jordan
 

Thank you sir!

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Marlin Technician
Oregon
Marlin
 

Bleed and fill the system.

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David Owner/Technician
Alberta
David
 

If you have good heat when driving, the heater core is pretty goodl You have flow volume issues, likely due to air trapped in the heater circuit. As others said, get the air out with vacuum or bleed the line when pressured up. Sometimes, holding RPM up at around 4000 for 20-30 seconds and backing off, several times, compresses the air enough so that when you release the throttle the air will…

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Stuart Mobile Technician
Illinois
Stuart
   

AS others have suggested you most likely have air in the system. After raising the front end up and using the no spill funnel,mine is the lisle brand​. ​Fill the funnel about ½ was and after the thermostat opens squeeze the upper and lower radiator as well as the heater hoses until no more air bubbles in the funnel. Good luck.

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Norris Inspector
Colorado
Norris
 

Not all water pumps are created equal. A small difference in impeller depth can cause this problem.

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Amandeep Diagnostician
Saskatchewan
Amandeep
 

He got waterpump from dealership

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Dan Owner/Technician
Texas
Dan
 

… Did the heater work with the old water pump ??… I assUme it was replaced because it LEAKED … Dan .

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Helpful
Glenn Owner/Technician
Texas
Glenn
 

I recommend using a vacuum refill method. This likely has an air pocket trapped in the heater core or lines. Some systems can be very moody to get the air out of them. I have used a Mity Vac Air/Evac set for years and it gets the job done.

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Boruch Owner
Ohio
Boruch
 

Vacuum filling is the way to go. If you don't have a way to do that, I would follow the bleed procedure as outline in some of the the other posts. For the vacuum filling to work well you need to drain the system as much as possible first, then vacuum fill.

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Jon Owner/Technician
California
Jon
 

I would start by pressure testing the system to make sure you don't have any missed leaks. Then follow the advise already given here - vacuum fill or follow the TSB. Good luck.

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