Not sure but it could be that the car's heater unit water has air in it. If so I believe this can be caused by exhaust gases coming from a leaking cylinder head gasket.
It is not smoke. It is steam. Moisture is making the gurgling sound and moisture coming in contact with a warmer surface (the coil) is evaporating making steam.
Sounds like heater core is leaking
Most are up underneath the dashboard. Turn on the heater blower motor and listen where the sound is coming from. The heater core is behind that sound.
94 E 250 with 5.8 V8 sensor is on the exhaust pipe coming out of the engine on the passenger side. Access is from underneath just behind the front passenger side tire.
Bing will be coming with the new 2011 dashboard, which will be launched on the 25th of November.
Behind the engine hanging on the firewall. look from passenger side. looks like a silver coffee can with black hoses coming off of it.
my 1995 Trooper had same problem it was the crankshaft position sensor located on the middle passenger side of the motor. I will remove the passenger side front tire and it is behind the shock, tight fit but can be done.
It sounds like it might be in your coolant system. heater core maybe? Or maybe a sticking thermostat.
person coming from behind
behind the dashboard near the floor. turn on the fan and feel near the gas pedal for the air. Then just follow it to where it is coming from. This will be the heater box. Inside is what you look for.
Behind the passenger side tire on the steering rack. It should have a wiring harness with 2 wires coming off of it.
Trapped autoworker