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check coolant level in the radiator at the cap
the radiator flow tested for blocked cores
run the fault codes to check for tuning and timing issues
check for extra load on the engine such as low pressure in the tyres, slipping in the auto or travelling at high speeds
check for plastic in front of the radiator
If the thermostat is bad it normally goes to hot ( not a bit hotter than normal) check the cap for correct operatopn
check oil make sure it dosent look like milk if it dose you have a blown head gasket if not it could be abad cap not holding pressure a leak, or a bad water pump good luck year and make model would help try scott on you tube.
1. Thermostat. Replace with an OEM one from the dealer. 2. Radiator. Make sure it's not plugged up. 3. Radiator Cap. There cheap from the dealer and I consider them a maint. item. 4. Water pump. How many miles are on it? 5. Fan Clutch. Make sure it has some resistance
6. Temp. Sensor for the gage.Have you checked that the electric cooling fan is turning on when the
engine reaches operating temp? A faulty coolant temperature sensor will
not trigger the fan, or the fan itself or fan relay could be shot. You
might also have a head gasket leak that is not into the cylinders, so
it would overheat without causing milky oil. Another possibility is a
clogged radiator -- with 15 years on the vehicle, it's quite
possible. Have the cooling system pressure checked, and replace the
radiator cap for starters -- if the radiator cap isn't holding pressure,
overheating will occur rapidly.
The primary purpose of a cooling system is to maintain engine temperature in a range that will provide satisfactory engine performance and emission levels under all expected driving conditions. It also provides hot water (coolant) for heater performance.
Replace the thermostat. I have had bad luck with aftermarket thermostats on this particular year of GM/ Chevy trucks.They tend to stick closed and then fully open, thus causing the temp to sort of surge hot and cold. A good thermostat will slowly open maintaning a good consistant temp. I would recommend spending a little more and getting a GM thermostat.
Please take a moment and rate my answer..........Thanks
The core pipes in your radiator may be blocked with particles of junk. There is no easy way to clear them other than to remove the top and bottom tanks of the radiator and push a rods through the individual pipes to push out the junk.
You could try back flushing the radiator, that is force the water back through the radiator the oposite way it normally goes with a high flow hose.
Sounds like you may either have a thermostat that is not fully opening or a radiator that is partially obstructed (externally or internally). If I'm correct, what may be happening is that when the engine reaches operating temperature, it is continuing to get hotter but at the point you are at, the fans are able to compensate by remaining on. Only other possibility is that the temp sender is bad and sending incorrect info to the computer, causing it to turn the fan on. The concentration of antifreeze in a system does not change the operating temp. What it does is prevent the coolant from boiling at a temperature above what plain water would. Your radiator cap also helps with that as a liquid under pressure will boil at a higher temp. Proper concentration is 50/50. Normal operating temp is about 210 degrees(f). (+ ) (- ) 5 degrees) So, I'd test the coolant sensor and replace the thermostat. Hopefully the radiator won't need to come out but you may need to have it checked if neither other options work.
I think I can give you a solution that will get you back in business.
Before doing this you may want to drain about 50% of your Anti-Freeze coolant out and save it to reuse when your done.
1. Remove the top raditor hose and then the thermostat from under the "fitting" for the top hose of the radiator were it mates to the engine. Leave the fitting OFF the manifold / engine for now.
2. Stuff a garden hose in the hole and cover it with a rag.
3. Remove the radiator cap
4. Make sure your heater temp selector is set to the highest heat setting.
5. Have someone turn on the hose and hold the rag over the hole so that it forces the water from the hose through the engine. (Do this for well over 5 minutes until your sure all of the air is out of the system.
6. Turn off the water.
7. Reinstall thermostat manifold fittting and top radiator hose
(Radiator cap is still OFF)
8. Service the radiator with your Antifreeze you saved until the radiator is FULL to the almost the bottom of the radiator cap hole.
9. Start engine and let it warm up until the thermostat should open (i.e. reaches normal temp)
10 Manually and Rapidly increase engine speed several times from ilde to about 2000 RPM watching for water flow through the radiator.
11. After confirming water flow re-install the radiator CAP.
12. Check the heater for proper operation.
That is it... time to clean up the mess. Hopefully this solves your air lock in the engine cooling system.
P.s Check for leaks at the top hose and manifold fitting when the system reaches full pressure and don't forget that the Anti-Freeze is now diluted bigtime! .
loosen pressure cap slowly at coolant tank to relieve pressure,when pressure is relieved remove cap,place a suitable container under drain valve at bottom of radiator open drain valve.when coolant has stopped draining,close valve.then remove thermostat,[this is a good time to replace t.stat since it must be removed to refill cooling system],disconnect heater core coolant supply hose at rear of intake manifold.add coolant thru t.stat opening until coolant comes out of coolant supply hose fitting,reinstall hose and tighten[not to tight] reinstall thermostat o ring and thermostat.add coolant to tank until the coolant level is between the COOLANT FILL LEVEL marks.select the maximum heater temperature and blower speed settings run engine until it reaches operating temp.add coolant until the coolant level is between the COOLANT FILL LEVEL marks.turn off engine allow it to cool, recheck coolant level,add as needed .ford requires this procedure to avoid engine damage due to trapped air.
Could be a faulty sender, but first go through the checklist following:-
1) Check engine cooling fan/s are operating as required when engine temp rises above cut-in threshold - check fan control relay is ok, 2) Check for collapsing radiator hose on suction side of water-pump when motor revs raised above idle. 3) Check coolantreservoir pressure cap is serviceable, 4) Check coolant system is properly filled - carry out any bleed off procedure specified to clear any air locks- (ensure heater core coolant flow is turned on). 5) Check condition of radiator core:- i) for blockage of air flow to (bugs/grass etc), ii) for core internal blockage to coolant flow,