Question about 1992 Mazda MPV

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Overheats brand new rad,new waterpump,flushed system,took out thermostat.still overheats after 30km or so.

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It may sound odd but removing the thermostate all together may be your issue. The thermostate regulates by controlling the coolant flow. If the coolant moves too quickly thru a radiator it can actually pass thru with little heat loss to the air. (kind of like moving you finger thru the flame of a candle, quickly you never feel the heat) if the fluid travels too quickly thru the radiator it may pass thru before the heat escapes in to the air.
I'd replace the thermosate with a new (properly working) one and proceed from there.
I hope this may have helped,
Tom

Posted on Oct 02, 2009

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1. The radiator fan relay switch may be bad. Replace the little black box in the fusebox under the hood.
The socket is marked "Radiator fan".

2. The radiator fan may not be spinning. The motor may be disconnected or burned-out.

3. The lower radiator hose may be collapsing. It should be "firm" and not "squishy". There is a metal stent lining the hose. It may have rusted and collapsed.

Posted on Oct 02, 2009

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Any smell of rotten eggs,if so bad or plugged heater coil. Also check for leaks on passenger side interior.

Posted on Oct 02, 2009

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