Summary
If the thermostat is good, then there is likely a blockage in the coolant flow to the heater core. The problem appears intermittent, so it may be something like the inner lining of a heater hose being loose and folding over to block the flow, or there may be something inside the engine or heater core that is floating around and blocking the flow. A technician should be able to locate the blockage because there will be a temperature change on the heater hoses where the blockage is. It may take a while to locate the problem, but it should not be too difficult.
This type of squeak has been common during cold weather on many vehicles in the past. Before airbags, it was a simple matter of removing the steering wheel to apply some high temperature grease to the sliding electrical contacts. Now, with airbags, the system has to be temporarily disabled and the airbag removed before the steering wheel can be removed. Then the parts can be lubricated.I would avoid spraying any lubricant into the gap between the steering wheel and column. There are air bag electrical connectors in that area and they are not sealed. The lubricant could enter the connectors causing codes to set for the air bag system in the future and disabling the air bag system until it is repaired. The best way of fixing this problem is to have the parts lubricated when the steering wheel is removed.See the full content of this document
Extract
Cold-Weather Woes Leaving Owner Heated
2005 van's temperature problems could be thermostat or blockage
Backyard Mechanic / Jim KerrQUESTION -- My question is regarding my 2005 Kia Sedona van. I bought this vehicle new one year ago and it currently has 20,000 kilometres on it...See the full content of this document
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