Question about Mazda 626

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My 98 mazda seems to not be circulating the water correctly and we went througheverything and the water pumps new the head gaskets new theres no leaks. so we are stumpd and really need help

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  • jenwieben Jun 21, 2009

    Whats a possible internal coolant leaks on a 1998 mazda 626es v6?

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  • 316 Answers

If the coolant isn't flowing with a new water pump; your thermostat isn't working correctly, or your radiator is clogged and not allowing the flow to properly pass through the fins.

Posted on Jun 21, 2009

  • its420_us Jun 21, 2009

    If there is no coolant or muck on your oil dipstick, there is most likely nothing wrong internally. Seeing how the car is a 1995, and the coolant isn't flowing (according to your post), I would look to replace the radiator if you have already replaced the thermostat. Radiators go bad, and it is always best to purchase a "new" one, rather than a used one. I hope this helps, and a better rating would be appreciated.

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2001 Blazer Replaced heater core now water pump is squealing and seems like low circulation


my 98 Blazer I had to replace radiator water pump heatercore and hoses. Had head gasket go. Once that happens air and dexcool corrode cooling system. Do you smell antifreeze? Are you loosing antifreeze? Check oil see if its another color not clear or black but i think light brown. Have you flushed out system?

Jan 31, 2013 | 2001 Chevrolet Blazer

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Fixed every possible cause but still overheating


checked water pump for circulating the coolant?
checked the radiator if the coolant circulated correctly?
thermostat renewed?
thermo switch checked whether is working?
fan switch checked whether is working?
checked whether the matrix could circulate the coolant?
ckecked whether there is any valve on the matrix hoses and is working?
have you bled the cooling system ?
have you checked whether you have a cylinder head gasket with problem and pressurized the water?
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have you checked whether the radiator cap is working ok?
have you checked whether the radiator cap is with the correct pressure for the cooling system?
checked whether the cooling fan is working?

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Jetta continues to overheat despite changing the water pump, 2 thermostats, radiator, and coolant temp sensor. Seems as if the coolant is not circulating at all through the system. Radiator continues to...


seems like you have done the right things. i have repaired cars with same problems and it is the head gasket..the ones I worked on did not have any water in the oil but when I pulled the head off the gasket was blown. Let me know if that helps

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My exe's 98 blazer overheated on the way home last week, replaced thermostat on the side of the road, no help. She took it to a repair shop they told her they did a CO check of the coolant and she had a...


Assuming the following;
The head gaskets were replaced properly
The Water Pump was replaced properly
The Thermostat was replaced properly

There are only a few other things to check.
1) if you you remove one of the heater hoses from the engine bib during a cold filling from the radiator - it will release trapped air until you see the coolant coming out the motor side - this works great to ensure the air is out. Hook hose back up before running.(or you could leave the hose off for a second and start it to see if water gushes out - water pump check - kinda messy though)

Remember that heater water will circulate even with the thermostat is closed.

if that does not work, then you need to ensure the top hose going to the radiator warms up indicating the thermostat is opening and hot engine water is starting to dump into the radiator.

2) the radiator more than likely is clogged and needs cleaning by a radiator shop, or replacement if it is not one that can be cleaned.

Ask your son if he remembers looking into the water ports where he took off the old water pump, sometimes of the system is not flushed at proper intervals, it will sludge up the water jackets and keep water from circulating through the motor.

one last thing (gulp) That CO check is pretty accurate - and cheap. You might want to have it checked again - because the heads should have been inspected for cracks as well as pressure checked before putting them back on - especially since the motor overheated. That alone will crack the heads beyond repair - more so than not.

Let me know if you have any other questions.

Good Luck.

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have you checked the waterpump it is 10yrs old could not be circulating the water, also have it pressure checked to see if it leaking or loosing pressure.

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