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Old 11-06-2011, 02:19 PM
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Is this a water pump issue?

For some time, I've been seeing 85 degree cooling system temps, reaching up to 90 on warm days. Even when it's cold out, I still see 85 degrees C. It used to to peak at 80, even on warm days. So, I put in a new radiator, new thermostat, and tested the aux pump. Everything should be perfect, but I'm still seeing 85 degree coolant temps, even on near-freezing days.

Today, I took my thermo gun and aimed it at the radiator, with the vehicle stationary (of course). I'm seeing 78C near the inlet, and 23C near the outlet. Most of the radiator reads much cooler than the 78C inlet temp. The outlet hose feels cool. Could this be a flow problem? The water pump was replaced at 109K, 16 years ago. Could the pump vanes have eroded? Or should I look elsewhere? I'm wondering if I might have missed removing a plastic plug when I installed the radiator...

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Old 11-06-2011, 03:10 PM
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Seems normal to me. 603s read hotter than 617s at the temp gauge.

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Old 11-06-2011, 04:20 PM
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This one didn't used to. Something changed, and I'm trying to figure out what happened.
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Old 11-06-2011, 04:31 PM
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Did you acquit the cat from the other thread?

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Old 11-06-2011, 09:35 PM
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Yup. Helped some, I think. Of course, my worst fear is a cracked head, but it doesn't overheat.
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Old 11-06-2011, 09:41 PM
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Normal operating temps for a 61x engine is between 80*C and 90*C. If your start running lower than 80* constantly or above 90* then I'd start worrying.
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Old 11-07-2011, 06:30 PM
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I'm troubled by the apparent lack of coolant flow through the radiator. The inlet hose is hot, but the outlet hose is always stone cold. I'm not seeing the hard upper hose when hot/collapsed hose when cold symptom that seems to accompany a cracked head, though.
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Old 11-07-2011, 06:44 PM
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Quote:
Originally Posted by Rob124 View Post
I'm troubled by the apparent lack of coolant flow through the radiator. The inlet hose is hot, but the outlet hose is always stone cold. I'm not seeing the hard upper hose when hot/collapsed hose when cold symptom that seems to accompany a cracked head, though.
You are worrying about nothing !!

Your temps are fine. The outlet of the radiator should be colder than the inlet. Your thermostat is restricting the flow to make sure the motor is warm enough.
If you wish to see what happens when a water pump doesnt work, take the belt off for a few minutes. I say this in jest, I am not really suggesting you try & run your car without it !!! The car would boil real quick.

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