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Old 09-11-2010, 05:47 PM   #1
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heater squeal

fairly new(to me-8 days) 98 4 cyl/5 spd that squeals like a stuck pig when it's cool out and i turn on the heater. It goes away once i get moving/warms up(and works pretty good). Something I should be concerned about or something that needs a shot of oil? have a 2500hd that has always grumbled when cold/wet but did it since new and no problem(cept for the noise) going on 7 yrs.

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Old 09-11-2010, 06:16 PM   #2
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First thing I would check would be the fan belt and see if it is loose.

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Old 09-11-2010, 06:37 PM   #3
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Like Barrie said, prob worn belt and when it calls for more voltage as in the heater motor running, it squeals cause its harder to turn the alt. So pop the hood and squirt just a lil water on the belt while it is doing it and see if it changes pitch or disappears. If so change the belt. Good luck.
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Old 09-11-2010, 07:13 PM   #4
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Open the hood before starting - if it's a belt you'll hear it coming from there. May not be the belt, an idler pulley bearing could be going south. Not difficult to replace.
They tend to quiet down after a few minutes running.

If it's a blower motor you'll hear it more inside than outside.
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Old 09-11-2010, 07:47 PM   #5
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thanks-once it's warmed up or moving(higher rpm) it usually stops. Sometimes when i turn off/on the heater it stops. Definatly not the heater motor-comming from under the hood. Does the compressor come on for heat too, or just for the air-seems to get an added load on the engine when i turn on the heater.(change in pitch)
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