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Old 01-11-2017, 01:01 AM   #31
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I started getting a whistle sound this winter. it occurs when I start the car and step on the break to shift to Drive. At first I thought it was the act of shifting to Drive, but just today, it lasted longer for a minute after i started driving. The whistle sound would happen when I pressed down on the break. It only happened for the first minute maybe while the engine was still cool? The sound was not cyclical like a belt or breaks. It was definitely a whistle - a high pitch sound coming from the engine...

Any ideas?
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Old 01-11-2017, 06:41 PM   #32
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My Jeep started doing this when the cold weather started too. Only when throttle plate is closed or almost closed. Haven't gotten around to checking it yet; haven't had the time. It sounds like an Intake leak or the whistle you get from an open filter air Intake at partial throttle.

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Old 01-18-2017, 12:05 PM   #33
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for me, it was the Thermostat.. the whistle would get louder the more the car warmed up on cold days.. when it got really cold, the CEL came on.. the CEL was for the thermostat.. i took off the thermostat housing and noticed the Thermostat housing was corroded additionally it had an tremendous amount of TRV.. ended up changing the Thermostat Housing, Thermostat, upper radiator hose, Coolant Temperature sensor... and while i was there.. decided to do the Water Pump as well (no telling when it was last changed).. so for the water pump i installed a new Waterpump, waterpump gasket, waterpump inlet tube.. easy job.. toughest part was cleaning off old RTV and old gasket

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