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B20 Overheating! 140-160

uid 51722's pic
posted by  Sam G on  Mon Aug 22 10:23 CST 2011
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last visit: Thu Oct 23 00:53 CST 2014
[RELATED]

Overheating without a thermostat means the thermostat is NOT the issue.

In that case it's almost certainly a radiator needing to be rodded out.

The fan can't be the issue; if it were the fan it would only happen in stopped traffic. You can remove the fan entirely and it still won't overheat when you're moving 30+ mph: a headwind is as good as a fan.

Water pump *could* be the issue -- impellers can erode away, but it's not common. Does your heater work? If your heater gets good and hot, then your water pump works.

Timing is very easy to check.

Head gasket may be blown if you've already overheated it badly. Check it but consider it more likely a symptom than a cause.

I would bet good money on a stopped up radiator. Flushing ain't enough -- rod it out.






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