# 2000 Toyota Sienna - is trouble brewing?

**URL:** <https://community.cartalk.com/t/2000-toyota-sienna-is-trouble-brewing/126606>\
**Category:** Maintenance/Repairs\
**Tags:** sienna, toyota\
**Created:** [October 12, 2018, 12:09am UTC](https://community.cartalk.com/t/2000-toyota-sienna-is-trouble-brewing/126606 "2018-10-12T00:09:57Z")\
**Posts on this page:** 6\
**Page:** 1

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**Author:** ![LarryFisher](https://avatars.discourse-cdn.com/v4/letter/l/51bf81/32.png) [@LarryFisher](https://community.cartalk.com/u/LarryFisher)\
**Post date:** [October 12, 2018, 12:09am UTC](https://community.cartalk.com/t/2000-toyota-sienna-is-trouble-brewing/126606/1 "2018-10-12T00:09:57Z")

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I have added coolant 4 times (filled overflow resevoir) in the past year. It has a 165,000 miles. I bought it new. It is in excellent condition. Vast majority of miles are highway. It has never and still does not leak a drop of any fluid. I am worried about the head gasket. There is no colored smoke from exhaust. Runs great. How can I tell if I have a big problem beginning to show itself? Thank you so much!

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**Author:** ![Mustangman](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/mustangman/32/44130_2.png) [@Mustangman](https://community.cartalk.com/u/Mustangman)\
**Post date:** [October 12, 2018, 2:09pm UTC](https://community.cartalk.com/t/2000-toyota-sienna-is-trouble-brewing/126606/2 "2018-10-12T14:09:39Z")

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How much have you added each time? How low was the overflow bottle - empty? Or a little below minimum?

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**Author:** ![Tester](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/tester/32/15976_2.png) [@Tester](https://community.cartalk.com/u/Tester)\
**Post date:** [October 12, 2018, 4:23pm UTC](https://community.cartalk.com/t/2000-toyota-sienna-is-trouble-brewing/126606/3 "2018-10-12T16:23:19Z")

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Try replacing the radiator cap.

If the radiator cap isn’t capable of holding the proper pressure, coolant can escape from the cooling system as a vapor.

Tester

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**Author:** ![jtsanders](https://avatars.discourse-cdn.com/v4/letter/j/c2a13f/32.png) [@jtsanders](https://community.cartalk.com/u/jtsanders)\
**Post date:** [October 12, 2018, 5:05pm UTC](https://community.cartalk.com/t/2000-toyota-sienna-is-trouble-brewing/126606/4 "2018-10-12T17:05:26Z")

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Take off the oil refill cap and inspect the inside. Is there fluid that looks like a latte? If so, you have head gasket damage letting coolant into the oil system.

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**Author:** ![shanonia](https://avatars.discourse-cdn.com/v4/letter/s/9de053/32.png) [@shanonia](https://community.cartalk.com/u/shanonia)\
**Post date:** [October 12, 2018, 5:10pm UTC](https://community.cartalk.com/t/2000-toyota-sienna-is-trouble-brewing/126606/5 "2018-10-12T17:10:02Z")

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Coolant in the transmission due to radiator internal leak?

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**Author:** ![LarryFisher](https://avatars.discourse-cdn.com/v4/letter/l/51bf81/32.png) [@LarryFisher](https://community.cartalk.com/u/LarryFisher)\
**Post date:** [October 12, 2018, 5:21pm UTC](https://community.cartalk.com/t/2000-toyota-sienna-is-trouble-brewing/126606/6 "2018-10-12T17:21:36Z")

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Hi. The overflow was empty. Thanks for the help!!

---- Mustangman [cartalk@discoursemail.com](mailto:cartalk@discoursemail.com) wrote: