Vibration/knock with heat on
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Junior User
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Vibration/knock with heat on
Recently I noticed I have a vibration and what feels like a phaser knock or timing chain rattle when I turn on my heat when the truck is at operating temperature, other than that it runs fine. I've tried searching on this but I'm kinda stumped with it.
I just had my timing chains, tensioners, vtc solenoids and chain guides replaced in the fall about 14k miles ago. I would think that turning on the heat would draw some away from the motor to the heating core and help with the oil not thinning.
Truck is a 08 F-150 XL with the 5.4 flex fuel and 112xxx miles. I only run 5w20 synthetic with a motorcraft filter.
I just had my timing chains, tensioners, vtc solenoids and chain guides replaced in the fall about 14k miles ago. I would think that turning on the heat would draw some away from the motor to the heating core and help with the oil not thinning.
Truck is a 08 F-150 XL with the 5.4 flex fuel and 112xxx miles. I only run 5w20 synthetic with a motorcraft filter.
Elder User
Joined: Nov 2008
Posts: 668
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From: Northfield, MI
Turning on the heat doesn't change how hot the engine runs to any measureable degree, so you really aren't accomplishing anything by doing that.
As for the noise, turning on the heat doesn't change anything in the engine, but turning the A/C on does, and most likely you have a problem either in the compressor itself or the belt drive system. Remember the A/C runs in all positions except "panel" and "floor."
As for the noise, turning on the heat doesn't change anything in the engine, but turning the A/C on does, and most likely you have a problem either in the compressor itself or the belt drive system. Remember the A/C runs in all positions except "panel" and "floor."
Thread Starter
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Junior User
Joined: Aug 2012
Posts: 53
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Turning on the heat doesn't change how hot the engine runs to any measureable degree, so you really aren't accomplishing anything by doing that.
As for the noise, turning on the heat doesn't change anything in the engine, but turning the A/C on does, and most likely you have a problem either in the compressor itself or the belt drive system. Remember the A/C runs in all positions except "panel" and "floor."
As for the noise, turning on the heat doesn't change anything in the engine, but turning the A/C on does, and most likely you have a problem either in the compressor itself or the belt drive system. Remember the A/C runs in all positions except "panel" and "floor."
Elder User
Joined: Nov 2008
Posts: 668
Likes: 6
From: Northfield, MI
To clarify, it doesn't matter what the temperature **** is set at, only what the mode **** is turned to (panel, floor, etc.) In other words, when you set your "heater" to defrost in the middle of winter with temp set all the way hot, the A/C compressor will still operate. It does this to dry the air as well as to circulate the oil in the A/C system. This has been a normal operating strategy since R134 started being used in the mid 1990's.
So, start the engine, turn the defroster on, pop the hood, and see if the noise is happening when the A/C compressor cycles on.
DO NOT put any "dressing" on the belt. If it's making noise it needs to be replaced. Belt dressing makes the belt sticky and dirt will build up and act like sand paper on your pulleys.
So, start the engine, turn the defroster on, pop the hood, and see if the noise is happening when the A/C compressor cycles on.
DO NOT put any "dressing" on the belt. If it's making noise it needs to be replaced. Belt dressing makes the belt sticky and dirt will build up and act like sand paper on your pulleys.
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