Question about 2005 Nissan Pathfinder

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2006 pathfinder heater goes from hot to cold the coolant is not low !

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This issue may be due to a restricted radiator. The engine heats up but can not flow through the radiator fast enough and pushes the coolant into the overflow until it runs over. Then the engine draws coolant back in showing a low condition.

My suggestion is to check the radiator with an electronic tool for checking temperature. If the temperature is 180 - 200 on the upper hose and 75 - 95 on the lower hose then the radiator needs to be replaced.

A faulty thermostat (stuck open) would not heat up.

A faulty thermostat (stuck closed) would not cool down, but would push coolant out of the overflow tank.

If the vehicle has white smoke (actually steam) coming from the tail pipe, then you most likely have a blown head gasket.

Posted on Dec 11, 2009

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I have a 98 chevy malibu and when i turn the heater on the blower works fine but the air goes from hot to cold hot to cold every couple minutes. what might be the cause of this


First thing to look at is coolant level. It sounds like the coolant pump will push coolant to the heater core and then stops pumping because it has air because to low. If coolant level is full, the vanes on the coolant pump might be spinning on the shaft, in which case you will have to replace the pump.

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Heat goes in and out and the temp gauge goes up and down


Your temp sensor has nothing to do with your heater. The temp sensor needs coolant in order to work properly. So first check the coolant level because if it is low your heater will act the way you describe. Once the coolant gets low enough the heater will blow cold. Another possibility is the radiator cap. After the engine has warmed up it expands when it cools down it contracts. As it is contracting if the cap is weak air can be drawn into the system and cause air pockets to form and will cause the same problem

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My heater does not get warm unless ur on the freeway hitting 60mph ..why?


IT COULD BE EITHER LOW ON COOLANT CHECK THE RADIATOR WHEN IT IS COLD OR THE HEATER CORE IS PLUGING UP YOU CAN CHECK THAT BY FEALING THE HEATER HOSE IF ONE IS HOT AND THE OTHER IS EITHER COLD OR WARM THEN THE HEATER CORE IS PLUGED CHECK COOLANT LEVEL FIRST

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Heater does not blow hot only cold air. Every so often the heater blows hot . When driving on freeway the heater works sometimes but turns cold when at red light.


Check the radiator level, if it low the hot coolant will not reach the heater. Second may be the water pump, as it wares the clearance increases and the efficiency goes way down and it cannot pump the coolant unless the engine revs are up.....

Feb 13, 2010 | 2005 Dodge Caravan

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I have a 2006 Ram 2500 Diesel. My heater quit working. One minute it was blowing hot air, then next it was blowing cold air. Any ideas what this is or how to find out without spending an arm and a leg?


low coolant. disconnected or faulty servo to control difference between hot and cold or the heater core could be clogged. if it warms up when reving the engine then it is probably low coolant.

Jan 20, 2010 | 2006 Dodge Ram 2500

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I have a really strange problem with my Nissan 2006 Pathfinder. The heater will not heat up and blow out hot air as long as the vehicle is sitting idling. When I want to defrost the windshield on frosty...


Since your blower is working and it is a heat issue,thats where we'll start,First thing is have you checked the coolant level in the radiator when engine is cold,make sure it is filled to top,next verify you have coolant in reserve ,Start your van and get it up to normal operation temperature,If your heat gauge on the dash works correctly it should be 190 degrees,Now lift the hood and locate the two heater hoses going into the heater assembly at the fire wall,Both hoses should be hot to hold on to,if both are hot and no heat inside your problem will be the blend air door in heater assembly.
if neither hose is that hot you need to replace the thermostat in the engine to get it up to 195 degrees.
if one hose is hot and one is luke warm then the heater core is blocked and to blame. hope this helps y

Jan 03, 2010 | 2006 Nissan Pathfinder

2 Answers

Low heat condition. Heater goes from hot to cold


A low coolant level can cause this problem. If the coolant is low, look for a leak around the waterpump area. If the leak isn't severe you can just top it off as needed until you have the time and/or money to have it fixed.

Oct 15, 2009 | 2005 Chrysler Town & Country

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2005 Pathfinder Heat Flow problem


I am having/had the same problem. My rear heater has not worked the last 2 winters, still trying to figure that one out. But I think I solved the front heat problem myself. The heater was blowing cold air while idling and hot air when the car was moving.

I jacked up the front of the vehicle, took the cap off of the reserve tank for the radiator, turned the car on and ran the heat (AC off) for 15 minutes. This is supposed to release any air bubbles in the coolant system and I did see air bubbles emerge as I was watching (this might be normal occurance, I'm far from a mechanical expert). Anyway, this did not immediately solve the problem, still blowing cold air as it sat there idling after 15 minutes. Dejected, I put the cap back on, lowered the vehicle and resigned myself to taking it to a dealer.

But a funny thing happened the next day, the coolant level was a lower (no leaks on the floor) so I filled up, and sure enough, when I started the car and let it warm up a little, hot air started coming out of the heater!!!

As far as my wife knows, I fixed the problem for the price of a bottle of coolant, so I am a hero...but at first I thought it didn't work. Here we are a month later and still blowing warm air and haven't had to replace any more coolant...the internet is a wonderful thing!

Hope this works for you, and I hope I can figure out my rear heater problem as well.

Jan 22, 2009 | 2006 Nissan Pathfinder

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