Hey Scotty, I have a 2012 Nissan Frontier 4.0L V6 SV4X4 automatic. I had an overheating problem and the smell of coolant in my cab. I cannot determine if the smell is coming out the vents but I have a feeling that it is. I first flushed the system twice. nothing changed so I changed the thermostat. It did not work. Then I changed the radiator. that didn't work either so I changed my thermostat again in a last stitch effort before the water pump was coming out just incase it was a bad part. That thermostat worked and the truck is now running at a normal temp. But I still have the smell of coolant in my cab and I have no idea why. could you please help me head some light on this? Thank You!
Seth Rosczewski -Boston
If your heater core (and surrounding area) has a leak that could cause smell inside the cab, have you checked that yet?
BruceREE has the answer. Your heater core, or the hoses connected to it are leaking in the cab.
If you smell coolant in the cab it is very likely your heater core is leaking. Unfortunately in most (but not all) vehicles replacing that part requires taking the dashboard out.
