2007 nissan frontier has the heater core stop working when truck comes to a stop

by getting a repair manual

good information here......


http://forums.nicoclub.com/no-heat-t453299.html

hope it helps

If it has a AC you have to pump down the AC remove the entire heater and AC unit so you can disconect AC lines and heater hoses ,you have to drop the steering column and remove the glove box, its a big job I would buy a manual so you know what all you have to disconect.

that is a bad job have someone to do it

Try thermostat first and coolant change. The level in the reserve tank can be deceiving ... Check the Radiator directly when completely cold

Ohmigosh ! If it is coolant, feels slippery and smells like it? it is probably the heater core inside the heater case. It can't be fixed, but has to be replaced.
Look under the hood on the firewall where the two heater hoses go in-any sign there of a hose leaking? The hoses go right into tubes or pipes that are soldered to the heater core, so the hoses show you exactly where the heater core is located under the dash.
If you want to attempt changing the heater core, first buy a repair manual for the Frontier. The chapter on heating and cooling will have the heater core removal and replacement procedure, step by step. Read it and see if you want to do it-on some cars or models, it is easy, there is a cover plate to remove and then slide the core out...BUT on a lot of vehicles, the entire instrument panel has to be removed from the car to get to the heater core, a pretty big job. I have taken apart quite a few dashes and instrument panels ( and even put a couple back together), believe me, it is not for the faint hearted. So many screws to keep track of, so many electrical connections to be pulled apart, so much plastic to break. Not trying to dissuade you, just letting you know it can be a bear ! Your local library might have some repair manuals where you could find the procedure for your Frontier. Or stop in at the Nissan dealer and talk to a mechanic or parts person-they might be able to tell you if you have to remove the dash to get to the heater core.

Try to determine if it is coolant. Has enough leaked out yet that your coolant level in the radiator is low?

Well it could be a few things but i dont want to scare you so we will try the easiest one first. It could be low on coolant and that may have caused an air pocket to develop within the heater core. check your coolant levels and if needed do a coolant flush. possibly a bad radiator cap is another. the other problems could be a stuck (bad) thermostat or bad water pump.

probably a bubble of air in the system that hangs at the heater hose until pressure from water pump increases. Park on an incline to help the bubble migrate to the radiator. Open radiator cap, start engine and let it warm up until thermostat opens. after water is flowing in, fill radiator all the way to the neck. watch to see if bubbles continue to come up after the level stops going down, as this would indicate a blown head gasket. If bubbles stop, close cap and you should be good.

why do you want to remove it/change it??pretty bullet proof piece. havent seen one fail yet. what is your actual problem?? Clarify issue.

no i think the water pump impeller is starting to spin on the drive shaft ,the impeller is plastic on a metal shaft ,fairly common fault