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Re: Overheatin cady 1999
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
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Please check the line from the jacket to the blower unit as this can be clogged and so there will be no flow of the hot water to the blower unit. Some tips for overheating are given below:
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.
REPLACE THERMOSTAT AND RADIATOR PRESSURE CAP.MAKE SURE COOLANT NOT LOW.IF ALL IS GOOD CHECK FOR LEAKING WATER PUMP WEEP HOLE IF LEAKING REPLACE WATER PUMP.MAKE SURE COOLING FANS RUNNING.IF ENGINE RUNNING HOT WHILE SITTING LONG TRAFFIC LINE AND COOLANT NOT RUNNING.CHECK COOLANT FAN RELAYS AND FUSE.IF ALL IS GOOD HOT WIRE MAKE SURE COOLING FAN MOTOR GOOD IF COOLING FAN DONT RUN WHEN HOT WIRED FAN MOTOR BAD.IF FAN MOTOR OKAY AND FUSE RELAYS GOOD YOU HAVE FAULTY COOLING FAN WIRING.YOU COULD HAVE BAD ENGINE COOLANT SENSOR OR FAULT IN ECM CODE SCAN TO CHECK THEM BOTH.CHECK ENGINE OIL.LOOK LIKE MILK SHAKE YOU HAVE LEAKING HEAD GASKET.IF OIL LOOKS OKAY.YOUR ENGINE BLOCK, RADIATOR AND HEATER CORE NEED FLUSHING.
replace the temperature sending unit. Its right there by the thermostat. You can get this at any auto parts store. just need an open end wrench to change it. they do go bad(found out the hard way several years back). I hope this helps you
You may have to flush the system again. Did you use a commercial flush such as PrestoneSuper Flush? Plain water won't remove the rust and sludge. The Dex-cool antifreeze that GM recommends for their cars is bad about forming a gummy sludge in the cooling system. It clogs radiators and heater cores. I would suggest another flush with the Prestone product. Follow the directions closely for best results. One thing that will help is. after you drain the radiator, refill with clear water and let the engine run until the coolant is circulating good, then drain it again. Do this three or four times. This will ensure that all the antifreeze has been removed from the engine block. When you refill the radiator, use a green antifreeze that is compatible with aluminum radiators and aluminum engine parts. Do not use Dex-cool. Dex-cool can also cause the intake gaskets to fail. Make sure the new thermostat is at least a 195degree unit and that it is installed correctly. you would be surprised how many thermostats get installed upside down. After refilling the radiator, leave the radiator cap off and let the engine run until the coolant is flowing. Keep adding antifreeze each time the coolant is pulled down into the radiator. Use full strength antifreeze because the water that is retained in the block will dilute it. A 50/50 mixture won't protect below freezing.
OK you have done the engine side of things. If you have an electric radiator cooling fan make sure it comes on when radiator is hot, if not the fan motor is caned or the thermostat switch is faulty. Sometimes the fan motor is supplied by a fused/relayed circuit in which case these items will also need to be checked.
Check that not only does the top hose from the engine to radiator get hot but that the bottom one does too. If not this would indicate a blockage perhaps in the radiator core due to sludge. If full of sludge give both ends a flush out with a high pressure hose. Like wise do the same with the bottom hose back to the pump. If the water is circulating and the radiator fan is working then the normal cooling system is working as it should.
f the engine is running hot one last thing is to find the EGR valve and check that it is opening as it should. If not the combustion temperatures go very high. One indicator of a hot engine is blue/glazed spark plugs so take one out and check it for signs of hot running. If hot then look to clean the EGR valve and associated exhaust gas feeder pipe with frayed cable, cloth and and carb cleaner spray.
It sounds like water pump may be your problem. It circulates a 50/50 mixture of glycol (or some form of) and water
through the engine block and cylinder head and back through the
radiator. In the radiator the mixture is cooled when air passes over
the fins of the radiator. This is accomplished by driving or a
mechanical/electrical fan when stationary. The water pump also
circulates the mixture through the heater core giving the car heat. If the water pump is not circulating the water back to the radiator to cool, it will overheat. More heat is caused by the engine when driving (much less heat when idling), hence the overheating while driving. I hope this helps and good luck!
Well, assuming that the water pump is turning the correct way, looks like you are going to have to pull the radiator out & take it to a guy who cleans radiator interiors. Seems to me that you may have some sediment built up and the water is not circulating thru the rad. This would explain why the top is warm & the bottom cool with no thermostat. Whilst the rad is out, flush the block with water. See what comes out. Don't use a "flush kit" just yet. In my experience, the flush kits that you buy are not good for this issue, have it done by a pro, but, after he cleans it, then get a flush kit & flush the block anyway. If there is sediment in the radiator (from sitting), there is def sediment in the block.
The timing would have to be WAY OFF to make it overheat.
does it run hot while driving or in traffic?
if running hot at idle could be water pump not circulating enough try revving engine some and see if temp comes down. also check your fan clutch.
if running hot going down road probably radiator