Question about Mazda 626

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I have a mazda 626 td which I have fitted a new radiator to. Top hose is very hot and bottom hose is cold.When I undo the bleeding nut on the radiator and rev the car a little air bubbles come out, which I have been doing for 3wks. After you travel about 30 miles or start climbing I seem too loose power,checked thermastat,no thermastat in engine although the car heaters are very hot and always has been, whcih is very puzzling as the thermastat has been removed, there is no oil in water and no water in the oil and no problem starting. any suggestions as I'd be very grateful

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You may have a circulation problem, check this with a COLD engine, trun heater temp to cold, drain coolant, remove both hoses from the radiator, take a garden hose and put it in one of them, turn the water on, it should freely flow out the other, you may need to wrap a towel around the hose to get a bit of a seal, but it should not take much pressure to get it to flow, no flow? Are you sure the thermostat is out? Good flow? try the same to the radiator, does it flow? If both flow you may have an impeller that has come off your water pump, to test, reconnect bottom hose, leave top hose loosely connected, fill with water, start it, slowly pull the hose back, water should be flowing out with a good flow, if it isn't, you either didn't find the t-stat, or your water pump is kaput. Seems the t-stat is in an odd place on some of these, do you have a manual? look again because it sounds like a broken thermostat that is not opening, especially if your water flow test failed - no flow. Hope this helps

Posted on Apr 27, 2010


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, ckeck the upper hose to see if it is hot , than ckeck the bottom hose , is it cool , the temp sould be about the same .if it is super hot on top and cold at the bottom hose , the raditor may be blocked, and the coolant is not flowing. you can try to flush the radiator . look to see if there metal shaving in the coolant . if there is the radiator is breaking down. this happen to me , my car would over heat change radiator car is a,ok easy fix . radiator barn .com

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