Originally Posted By: MaximaGuy
One experiment to do if you replace the coolant, when the radiator drain is opened, it should flow really fast and then a small trickle. If it drains and drains you have a partially clogged radiator - aftermarket radiators are far better than stock and bigger and better.
Not sure with Siennas, but at least with my Liberty the OEM one is far thicker and better than the aftermarket ones. Most people on the Liberty forum are lucky to get a few months or a year from an aftermarket rad. I got 3 years from one compared to 9 years from a factory one. One guy went through 12 Napa/Spectra ones in a year, went to Mopar and not an issue since.
On the XJ forums people seem to have good luck with aftermarket. Not sure which category the Sienna falls into but I think OEM is best.
I have a feeling this issue was a bad t stat, get OEM only.
One experiment to do if you replace the coolant, when the radiator drain is opened, it should flow really fast and then a small trickle. If it drains and drains you have a partially clogged radiator - aftermarket radiators are far better than stock and bigger and better.
Not sure with Siennas, but at least with my Liberty the OEM one is far thicker and better than the aftermarket ones. Most people on the Liberty forum are lucky to get a few months or a year from an aftermarket rad. I got 3 years from one compared to 9 years from a factory one. One guy went through 12 Napa/Spectra ones in a year, went to Mopar and not an issue since.
On the XJ forums people seem to have good luck with aftermarket. Not sure which category the Sienna falls into but I think OEM is best.
I have a feeling this issue was a bad t stat, get OEM only.
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