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Coolant not circulating--bubble?

14175 Views 8 Replies 5 Participants Last post by  mdhimes
2005 Escape Hybrid

I replaced the auxiliary water pump because it failed (no heat in EV mode). I filled the coolant reservoir to the full level, but it took nowhere near as much as drained out, which did not surprise me since I expected a bubble. I left the cap off, started the engine, turned on heater full blast and waited for the system to "burp." No burp, even after fans kick on (I shut off at that point) and no heat, either. I had to use the defrost to keep it running or the car would go into EV mode after about a minute. I took the new aux. pump off to check that it was not the culprit--water flows through it fine and I still have the same problem when I put the old pump back on there.

Is it possible that there is so much air in there that the main water pump cannot draw any coolant through the system? If so, what is the best solution for me to try?

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When you were waiting for the "Burp", did the engine get up to temp so the thermostat opened? I'm wondering if it wasn't allowed enough time to warm up.
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