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The night before my truck smelled strongly of antifreeze and yesterday morning i noticed antifreeze on the passenger side floor mat With ac systems, the refrigerant needs to pass through tiny holes in an expansion valve or an orifice tube, not the same as in the engine cooling system. Popped open the glove box and the leak seemed to be coming from above the heater core / evap / blower area as i noticed a bit of antifreeze trickling down from.

Just got word from the dealer air is getting in my coolant system and i need to replace my heater core, wondering if anyone has ran across this yet i did have some noise in the dash, wondering if anyone has had a leak and sealed it themselves or replaced heater core I think to run/cycle stop leak through a heater core independently would not work, one would need the heat and pressure of the system This is truly a slow leak at this point but i went ahead and bypassed the heater core at my destination since small leaks tend to become big leaks

Here are some possible causes based on some research

Poor maintenance practices (wrong coolant, infrequent coolant changes, using tap water, etc.) 3. This are couplers that allow some movement in the heater core pipe and don't sell those parts separately Rather than pay the $250+ for the genuine nissan part, you can go over to rockauto.com and purchase the aftermarket equivalent for $50+shipping My choice would be the osc 99072, which is the closest in construction.

I replaced mine recently and the clamp connected to the heater core started leaking within 2 weeks of installing it I ended up using a worm gear hose clamp to fix it. If it is your heater core, you will typically have a film of glycol on the inside of the windshield Personally, i would clean the underside of the vehicle really well, run the heck out of the heater and park it in a garage where you can watch for the leak

Also, check where your hoses go through the firewall to your heater core.

Here is a another method to bypass the heater core when it starts leaking in the cabin and you just don't have the time or money to invest further into your frontier My ride is a 2006 crew cab se and all the common things are failing are easily fixed with your posts I hope to get another year or two but its been solid this entire time. After checking things out, i discovered a leak around one of the heater core hoses (see pics)

I don't have anything leaking in the interior of the truck It appears to just be from that hose So, a couple of questions:

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