Buzzing From Dash
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Junior Member
Joined: Apr 2002
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Buzzing From Dash
Hi,
There is a buzzing coming from the dashboard, possibly the heater control area that changes with engine RPM and vacuum. When vacuum is high, the buzzing is loudest. None of the heater control or temp settings has any effect on the buzzing. I'm sure it is vacuum related. What should I check and how do I get the dash apart? Where do I find the vacuum line in the engine compartment that goes to the heater/AC controls?
The truck has been good. 25K Miles of pulling 6000 travel trailer from Oregon to NY twice. No trans problems, no engine problems, no oil leaks, no oil burning. Now at 40k miles. I would say that the truck has been under some severe use. For example I came up a grade in Oregon where accelerator was pegged for 10 minutes with the trailer. no overheat. Overall very pleased. Engine light on now due to miss just off idle. I need to track this down.
Problems repaired...leaking power steering pump damaged by dealer while replaceing squealing pitman arm. Rear window, slider leaked...rear window replaced. Headlights went out...multifunction turnsignal switch replaced. Trans fluid now Mobile 1 Synthetic.
There is a buzzing coming from the dashboard, possibly the heater control area that changes with engine RPM and vacuum. When vacuum is high, the buzzing is loudest. None of the heater control or temp settings has any effect on the buzzing. I'm sure it is vacuum related. What should I check and how do I get the dash apart? Where do I find the vacuum line in the engine compartment that goes to the heater/AC controls?
The truck has been good. 25K Miles of pulling 6000 travel trailer from Oregon to NY twice. No trans problems, no engine problems, no oil leaks, no oil burning. Now at 40k miles. I would say that the truck has been under some severe use. For example I came up a grade in Oregon where accelerator was pegged for 10 minutes with the trailer. no overheat. Overall very pleased. Engine light on now due to miss just off idle. I need to track this down.
Problems repaired...leaking power steering pump damaged by dealer while replaceing squealing pitman arm. Rear window, slider leaked...rear window replaced. Headlights went out...multifunction turnsignal switch replaced. Trans fluid now Mobile 1 Synthetic.
Senior Member
Joined: Feb 1999
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If it's still under warranty, let the dealer figure it out. If you want, you could possibly isolate the problem by removing and plugging the vaccum lines going through the firewall to see if it's vaccum related.
Other than that, you'll have to tear into the dash and that's something I know nothing about.
Other than that, you'll have to tear into the dash and that's something I know nothing about.
Member
Joined: Feb 2002
Posts: 96
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From: Antioch, Ca.
rlc3915
What year are you talking about?.
Check your hoses going to the heater core one of them has a restrictor in the hose, its the one that is attached to the thermostat crossover.
used a hose clamp to stop flow through the hose. If the restrictor in the hose is not working right it may be letting too much water setting up some type of vibration or noise in the heater core.
If you do replace the hose. You will get air in the heater core and will make sucking sound after you gun the throttle this is just all the air, it will go away.
Dogface
What year are you talking about?.
Check your hoses going to the heater core one of them has a restrictor in the hose, its the one that is attached to the thermostat crossover.
used a hose clamp to stop flow through the hose. If the restrictor in the hose is not working right it may be letting too much water setting up some type of vibration or noise in the heater core.
If you do replace the hose. You will get air in the heater core and will make sucking sound after you gun the throttle this is just all the air, it will go away.
Dogface
Senior Member
Joined: Mar 2001
Posts: 509
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From: Corona, CA
I had a problem with buzzing/mild rattling in the dash and thought it was coming from the heater box area, but I isolated it to one of the outlet louver vents in the dash. It made a noise anytime you had the fan switch on medium or high. I popped it out and put a small rubber washer on the bottom plastic pivot pin to eliminate the noise.
Member
Joined: Dec 2001
Posts: 14
Likes: 0
From: Memphis TN
My truck has a buzzing when sitting at idle, like at a red light. Bugs the living sh*t out of me. It is still under warranty, but don't want to lose it for a day to have them tell they 'could not duplicate the problem'.
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Junior Member
Joined: Apr 2002
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Hi,
I will check the heater hose as dogface says. Where do I find the vacuum lines into the cab as Dennis points out? It is not the rattling heard by Area 52, just checked that.
The truck is 97 F-150 XLT with 5.4. No more warranty.
I am very handy so I could probably fix it. Actually I'm a car nut. I am restoring a 68 camaro from frame up, have a 69 Nova hotrod with a 327 engine. These new computer controlled engines are not my game though. And man, it is crowded under that hood on the truck. I have not even located the spark plugs yet; not that I need to yet.
-Rob
I will check the heater hose as dogface says. Where do I find the vacuum lines into the cab as Dennis points out? It is not the rattling heard by Area 52, just checked that.
The truck is 97 F-150 XLT with 5.4. No more warranty.
I am very handy so I could probably fix it. Actually I'm a car nut. I am restoring a 68 camaro from frame up, have a 69 Nova hotrod with a 327 engine. These new computer controlled engines are not my game though. And man, it is crowded under that hood on the truck. I have not even located the spark plugs yet; not that I need to yet.
-Rob