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Radiator cooling fan doesn't come on and the antifreeze boils over

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There is a two wire connector going to the fan. My first step would be to isolate the fan by disconnecting that connector and jump the fan directly to the battery. If it spins, then the fan is good and your problem is elsewhere. Next find the fuse box, there are two and their locations are in your manual. Find the fuse/relay for that fan and eyeball the fuse for defect or replace the relay with one from autozone. If that is not it, then there is a temp sensor screwed into the head which sends the signal to turn on the fan. I think you have an ecotec and my advice is based on my early 1.9 L4 experience. There are two temp sensors, make sure you are replacing the right one and note the wiring plugs are actually different on each sensor. I have seen more than one ham fisted guy plug those on backwards.

Posted on Jul 09, 2010

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2006 Chevy trail blazer. Keeps getting hot. Anti-freeze is full, overflow container is half full. Every time I turn it off can hear fluid in radiator boiling and bubbling?


Pam are you sure it's boiling? If the Antifreeze is boiling I'd think you'd see steam coming out of your reservoir as the water expands into the reservoir, but you didn't say you see anything like that.
Of course engines get hot, that's why we have the cooling systems but it doesn't sound like it's "boiling" to me with no signs of visible steam unless your antifreeze level is really low?

If it's really boiling, and you antifreeze level is good, then your reservoir should be getting filled up with expanded hot water that goes into it to catch it when it expands.

If the water isn't going into the reservoir, then maybe your antifreeze level in the radiator is too low and you need to add antifreeze?
.
Best to fill the radiator with the engine cooled down. If you ever have to open the radiator when it's hot, NEVER open it with your bare hand as you could get scolded with boiling water. Instead use a big thick towel to remove the radiator cap off a hot engine. Again, if you can, just wait until the engine cools then open the radiator cap.

With the engine cool, you can fill the radiator with a 50/50 antifreeze mix. The 50/50 mix come premixed 50 percent water, and 50 percent antifreeze. So you can throw that stuff straight into the radiator.

Non mixed antifreeze needs to be mixed 50/50. Some people use 50 percent distilled water when they mix it because distilled water doesn't have the minerals in it that may get stuck in your radiator. That's being a bit picky about it though. Tap water works fine in a pinch. The other 50 percent is antifreeze. You can mix it right in the radiator too, put in a measured amount of the antifreeze, followed by the same measured amount of water. The water pump will mix it all together when you run the engine.

Put the cap back on and run the engine and if/when the water "boils" it should go into your reservoir. If it does boil in go in the reservoir then yes...your engine is getting hot and the antifreeze is boiling.

When the antifreeze boils, it's probably because your thermostat is stuck closed. That means the thermostat isn't letting water circulate through the radiator to get cooled. Thermostats are cheap...no more than $30 I'd say for most cars. Changing them is pretty easy too as they are usually right at the top of the engine. A mechanic may charge $100 to change it....but it's an easy job on most vehicles requiring just a couple sockets/socket wrench.

Oct 03, 2016 | Cars & Trucks

1 Answer

Overheating water in water bottle boiling how do I repair


You need to find the cause of the boilover. The most common is a stuck thermostat. If that is not the problem, be sure that you have the proper mix of antifreeze and water in the radiator. Too little antifreeze can cause boilover. If neither of these is the issue, the problem could be a clogged radiator, bad cooling fan/fan motor, or in the worst case, a blown head gasket or cracked head or engine block.

Feb 01, 2016 | Cars & Trucks

2 Answers

Overheating when stopped. New thermostat, new head gaskets. Antifreeze will be boiling and spill out the reservoir no matter what antifreeze level is.


Check your fan, if it is electric fan, make sure it comes on. Check if your radiator is blocked or clogged, Remove it and get it inspected & cleaned by a radiator repair shop

Aug 13, 2015 | 1998 Dodge Avenger

2 Answers

Replace cooling fan termstat and vehicle still over heats


Thermostat

Test thermostat in a jug and pour boiling water on it , it should compress meaning it works. Check that the waterpunp is operating pushing water into the engine .Check that radiator water flows to the watrpump. Is tension of fanbelt of waterpump sufficient that it doenst slip. Lastly check that the radiator fan is working if has a electric fan. if this doesn’t help check if radiator or engine water passages isn’t blocked.

Aug 29, 2009 | 1995 Pontiac Sunfire

1 Answer

Where can I get a wiring diagram for a 2003 saturn vue? After turning the air off, and the knob setting to zero, then turning the car off, I can hear the fan running for some time (like 10 minutes)...


That is the normal if your taking about the radiator ran, as long as the engine is hot, the radiator fan will run till the engine cools down enough for the temperature sensor to turn off the radiator fans. Your Saturn is 2003 and if you have not serviced the cooling system it may be time. The orange antifreeze has a life of 5 years or 150,000 miles and the green antifreeze has a life of 1 year or 30,000 miles. If the antifreeze has not been replaced, it may be a good thing to have the system flushed out with Preston radiator flush and then the antifreeze replaced with a 50/50 mix (water/antifreeze). If your not sure how to mix the antifreeze, you can buy them 50/50 premixed, With then new coolant, your engine can transfer the heat much better and will cool down faster. Note, too much water will boil over and too much antifreeze will gel up causing over heating. Good luck and hope this helps, keep me posted, be glad to answer any questions you may have. 

Jul 16, 2009 | 2003 Saturn VUE

2 Answers

2001 blazer - i have changed radiater,heatercore,waterpump and 2 thermostats - still overheating on me? coolant level is fine until it gets hot and boils out overflow tank? help!


Are your antifreeze 50/50 mix. Too much antifreeze ratio will cause over heating, the antifreeze will start to gel when it get's hot causing poor circulation. Water is the best liquid for heat transfer but it will also boil over and steam out the radiator cap, that is why antifreeze is added to keep this from happening. Looks like you have covered most of the base on your cooling system, Did you do a complete cooling system flush to get some of the corrosion out and it's been know for the orange antifreeze when gelled will clog up the cooling system. Make surer you have 50/50 mix and if you not sure you can buy a antifreeze meter at any large parts store like Auto Zone. Keep me posted, be glad to help.

Jun 29, 2009 | 2001 Chevrolet Blazer

1 Answer

03 silverado overheats while sitting with A/C on. Fan is working and coolant is full. It only overheats when A/C is on.


That is common since the a/c condenser is in front of the radiator. It may just be time for you to service the cooling system. If you have the orange antifreeze in your system, there only good for 5 years or 150,000 miles and then it needs to be flushed out and replaced with new antifreeze. Make sure the new antifreeze has a 50/50 mix (antifreeze/water) to much antifreeze will gel up when heated causing poor heat transfer and to much water will boil over. Water has great heat transfer but boils at 100C' so antifreeze is added. Service the cooling system for now, don't worry about the thermostat till you change the antifreeze unless you want to replace it too.  Good luck and keep me posted.

Jun 26, 2009 | 2003 Chevrolet Silverado 1500

2 Answers

Radiator boils over


There can be several causes, first replace the thermostat, radiator cap, also check to see if the cooling fans are working properly. They should automatically come on whenever the ac is on.

Apr 06, 2009 | 2001 Hyundai Elantra

2 Answers

Were are the sensors for the engine fans in a nissaan sentra gxe


One of the common things that gets missed at times is the radiator is down in cooling antifreeze. The car will act as normal during the warm up cycle and then the temperature guage will rise and then it will slowly come back down as the thermostat opens and/or the electric cooling fans come on. In actuality the engine is overheating, but it is not boiling over. The level of abtifreeze is at just the right level of lowness that you experience this phenomenon. After the engine cools off , (DO NOT REMOVE WHEN HOT - YOU CAN GET SCALDED WITH BOILING WATER/ANTIFREEZE)), remove the radiator cap and check the level within the radiator and also the antifreeze reservoir level. You can buy a 50-50 mix of antifreeze and water that is ready to put into the radiator. If the level in both the radiator and reservoir are correct, you may have a bad thermostat or some other problem.
Bob - 2003 Nissan Sentra SE-R SPEC V

Nov 25, 2008 | 2003 Nissan Sentra

2 Answers

Overheating ?


check to see if electric fans turn on in front of radiator

Jul 13, 2008 | 1996 Ford Contour

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