Question about 1999 Cadillac DeVille
There is no water circulation. changed radiator, and when flush engine its cool dawn. looks like pump is not running water. ??????
Hi jaanutno, I would suggest the to replace the water pump it sounds cavitated,after all else it is only an impeller in a housing so if it wont circulate replace, it good luck
Posted on Nov 11, 2008
Hello jaanutno, did you check to make certain the thermostat is operating? there may also be a weep hole on the water pump and you will see or feel some moisture there, you can remove the thermostat and boil it on the stove to see if it works once it reaches temp if it doesnt open you need a thermostat if it does work put the thermostat housing back together without the thermostst and start the vehicle to see if it will circulate one more thing to check is that the rad cap is proper for the radiator (how many psi) hope this gets you on the road good luck
Posted on Nov 11, 2008
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Posted on Jan 02, 2017
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The overheating of the car can be due to many reasons and you need to check on each one to confirm the working of the system.
1. In the first place the working of the engine must be assessed. it must be smooth with a good indication that the tuning timing and the power seems good. This will confirm that the settings of the engine is good and so there is less scope that the engine seems to heat up on its own.
2. Secondly the radiator pressure cap must be tight and good, the radiator MUST not loose coolant after a run or in a few days time- since this must be a sealed system and there is no scope of water overflow or loss unless there is a leak- sometimes the leak is too microscopic as under high pressure only steam might escape and so reduce the coolant. So check for leaks while the engine is hot , specially the radiator, the hose or the fittings.
3. The working of the water pump must be good to ensure a good flow and circulation, so check for leak in the water pump, check for presence of water in the exhaust or leaking on the engine gaskets.
4.Make sure that the coolant is good and clean if not drain and refill , if there is presence of rust please have a good flushing of the radiator or else the chances are that the radiator ports can be blocked and reduce the efficiency of the cooling .
5. Finally the cooling fan, the radiator fan must be working, check the thermostat/thermistor to work accordingly with good flow, have a good water jet wash on the radiator for a clean radiator cooling fin exposure.
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