Mostly when engine is cold or say at first start up a really anoying squeeking under slight accelaration of gas pedal and sometimes idle. Almost sound like it might be water passing through small hole in heater core or something. All I know is its driving my wife and I nuts Sounds like a coffe purculator and it comes from right under windshield center center right of dash board. Tryed prying on dash tappin on dash and even pulled dash apart about a month ago to locate sound came up with nothing. Any ideas?

 

By your discription, sounds like your coolant level is low, and you can hear the coolant rushing through the heater core. Have you checked your coolant level in the Radiator?

 

Problem solved. Turns out my Transmission Dipstick was rubbing against a bolt that sticks out of the fire wall . All of the vibration noise was transfering through into the cab. Crazy

Thanks for the advise though.