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When I get my RPMs up to 2000 the heat kicks on, but then…

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When I get my RPMs...
When I get my RPMs up to 2000 the heat kicks on, but then goes cold again when idle. Is this also a radiatorleak?
Submitted: 2 years ago.Category: Toyota
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Answered in 8 minutes by:
1/29/2016
Toyota Mechanic: Dan, Technician replied 2 years ago
Dan
Dan, Technician
Category: Toyota
Satisfied Customers: 26,048
Experience: Independent Shop Experience, 2 Year Automotive Diploma, & Access to Information Database
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Hello, my name is***** you checked coolant level? What year, model, make, and engine size of vehicle? Thanks

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Customer reply replied 2 years ago
2004 Sienna XLE 3.3 L V6. Coolant-full
Toyota Mechanic: Dan, Technician replied 2 years ago

If coolant level is full this would mean heater core is partially clogged or there is air in system. First try to burp air out of system to see if that helps, if not disconnect both hoses going to firewall and use a garden hose to flush it out from both directions. This would be about a $150 job to have done at a shop. Let me know how it goes or if you have more questions. Thanks.

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