2nd Gen Non-Engine/Transmission Gurggling noise behind glove box!

[peteweb]

Here is a strange problem that I hope someone can help me with. When I start the truck up, for the first couple of minutes there is a gurggling/bubbling noise that is coming from behind the glove box. It sounds like there is some kind of fluid in the black plastic ducts in there. The bubbling gets faster and louder as I rev the engine.



First Question: What is the black ducting behind the glove box? Is there a fan or something in it?



Second Question: Could it be from something spilling into the defrost vents on the dash (ie soda or coffee)?



Third question: Should I take the dash apart to try to drain it or should I just let it evaporate.







I has been doing this for a week or so now and it is getting annoying.





Any help would be greatly appreciated.

 

[Thomas]

Have you ruled out TSB 09-04-99?

 

[peteweb]

yeah, I have allready checked for that. The noise is coming from inside the cab behind the glove box.

 

[JR2]

Its probably just coolant running throught the heater core. I can hear it on my 01 when I turn on the espar heater. . It circulates the coolant with out the engine running.

 

[Forrest Nearing]

water in the heater core... normal

 

[CORed]

It could also be air bubbles in the heater core. Sometimes this happens after a flush or fluid change.



Normally, with time, they make their way to the highest point in the system... either the overflow container or the radiator itself. Check those periodically for low coolant and refill as needed.

 

[LDPetersen]

My 95' ctd does this and so does the wifes 95' 1500 gas 360. Hers has always had a poor heating system for this part of the country. If you clear the windshield your body freezes. If you heat your body the windshield fogs up. Is this just a poor design?

 

[peteweb]

so the heater core is inside the cab? I had just topped off the radiator come to think of it. It seems strange but I guess I wont worry about it.



Thanks

 

[WadePatton]

Yes, the heater core is a mini-radiator located in the cab. It is very well hidden under the dash. Replacement of one is an awful job. Look under the hood and trace the coolant lines to the firewall. Your heater core is on the other side somewhere.



And I've driven/ridden in dozens of these trucks--ONE, a 96, has the same gurgle noises.



Nothing to worry about. It's air in the system and maybe that TSB tells you how to bleed it.



HTH.

 

[JohnE]

My cooling system is SILENT except when i get an air leak.



The cab portion is the high point in the cooling system and air tends to collect there.



Check your heater and by-pass hoses for air leaks. Yes they will bleed air into the system, but not noticeably leak coolant-A/F.



A weak or dirty radiator cap is another culprit.

 

[peteweb]

Thanks so much. Its nice to know that it isnt somrthing that will cost me a fortune later down the road. I really appreciate all of your help.



TDR is the BEST

 

[CumminsPower98]

I don't know if this happens to anyone else but I get the water fall in the dash after using the block heater. I figure it must be creating air bubbles somehow. If I don't use the heater I have no air, which means no water fall. The water fall lasts only a few seconds on startup after reving over 1200 RPM.

 

[Bandit1]

i started hearing that same sound, upon searching i found i was low on coolant and an eventually found blown headgasket was the culprit. check everything and ignore nothing. i ignored that sound for a year and it caught up with me with a disabled truck and a very bad gasket. hope it turns out well

 

[SmokinU]

Yeah, I get the bubbling noise too, but only after using the block heater.



Brandon