Hello I need some help please
3 weeks ago I replace my coolant housing due to it broke while driving (last time replace was 3 years ago) it did the job myself.

Today the anti freeze in the reservior was boiling and steam was comming from the little hole on the anti freeze reservior , I open the hood to see If if the fan was working but not working and the temp gauge was at half way,also I didnt turn the heater on as my feeling was telling me the fan wasn't working that why the coolant housing blew up. It was verry cold all of February so I couldn't tell if the fan was working ,it was only-4 today in toronto, so that why I test it.
Questions
how can I test the relay to see if it working
why didnt the fan came on to cool the antifreeze aka coolant
what send the message to the fan to turn on, is there a switch

Thanks

 

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Check all the fuse they are good.
Replace the coolant reservoir cap.

Drove 1/2 hour to work this morning, with the heat full blast coolant reservoir was good ( no boiling up), when I got to work the gauge was 1/4, I turn the AC on to see if the fan would start, however they didnt.

I will change the relay 1 at a time to see if that the issue, as the cost is $20.00 can, as I believe they are the same as per the parts store.

I been reading all post in regards to fan not working on this forum

Any advise will help please

Thanks

 

If you have been reading you should know by now that the fans are not supposed to come on all the time. They are controlled by the PCM and come on only when the computer decides it's necessary.

The coolant reservoir for the 2.7L engine is pressurized, so if it cracks, the system will lose pressure and probably boil over.

If the temp gauge is halfway up, you are not overheating. If it goes up to the top and the fans still don't come on, then you have a problem. If you suspect overheating, running the heater at full blast will help the system dump heat.

 

Thank for your help
I will try to run the car without the heat to see if the coolant will boil over over again ,or if the temp guage would pass 1/2.
I dont want to damage my engine so If the temp rise at what point should I turn off the engine.

 

If it gets up to the top of the range, shut it down. Then let it cool down for a while before you do anything. If you remove the radiator cap while it's very hot, it'll blow all over the place.

 

Drove for 2 day no issues, however I call up an mechanic friend who use to work on my other car and he said he think its the PCM.
I have been driving with the heat at full blast for the past 2 days.

I am going to take the car to a different mechanic to see what the issue is today, as I have to do lots of highway driving this weekend ( over 100 k) and want ensure it doesn't shut-down or overheat on the highway.

Question : if its the PCM Should the check engine light comes on the dash, there is no light on the dash board.

Will post results .

Thanks

 

Update on my trip to the Mechnic
Thing working
Thermostat working
Fan working manually only
Coolant temp sensor working

Tests
Confirm there on leaks on the coolant systems
Or coolant reservoir
He hook up an hand held obd 2 meter and look for codes
And found NONE
He also check the coolant tempature it was between 212 to 220.

Car was running and he pull on the low side relay and the fan came on
And run until the temp drop and the gauge was at 1/4
Shut the car off let it cool down and start it up again wait until the
Tempature reach 220 and waiting in the fan to start (is didn't work)
He run the car until the coolant reservoir start to boil and steam was
Coming out from the little hole on the reservoir and pull the low fan relay to make the fan
Kick in
After trying for another hour he told I need to find someone you specialist in those cars
Cause if can't find what wrong.
Question
What is causing the not to come on
Any advise please
My next step is to take it to the dealer
However I can't afford to pay much
As the only worth approx 2 to 3 k
It has 164 000 k

 

With the A/C off, the low speed fan should NOT come on until the coolant temperature exceeds 220° F. The high speed fan will not come on until the coolant exceeds 230° F.

Pulling the relay causes the fan to come on. It's supposed to do that. It's a fail safe mode to turn the fan on when the PCM detects a problem.

If the system boils over at 220° you may have a bad radiator cap or one that is not high enough pressure. It needs to be able to hold at least 14 psi.

 

I replace the coolant reservoir cap with a new one 3 days ago with a new ones that says maxiunium 14psi
When you say a bad radiator cap do you actually means the Radiator cap I though those dont come off .
can you confirm if they do come off

we watch on this meter until the temperature rises to about 250 degrees fahrenheit the pull the relay to cool down the engine, cause the coolant start to boil in the coolant reservoir.

Thanks for you help

Thank you very much

 

There's only one radiator cap. It's the one on the reservoir. It should be a MINIMUM (not maximum) of 14 psi.

Your previous post said 220° F, now you say 250° F. Which is it?

What were you using to measure the temperature? If you were taking it off the OBD connection, then you were reading it from the same sensor that the PCM uses to decide when to turn on the fans. If it was 250° then you have a problem. If it was 220° then you don't.

Are you certain that you have the correct coolant at the correct concentration? If you have too much water in the mixture it will boil at a lower temperature.

Pure water will boil at 212° F at sea level pressure. Adding antifreeze will raise the boiling temperature. Increasing the pressure will raise the boiling point further. With the correct mixture of antifreeze and the correct pressure as controlled by the pressure cap, the coolant should not boil even at 230°F. It should never get up to 250° F.