There is no radiator cap on the Northstar engine.
The only cap is on the surge tank (or expansion tank) and is pressurized.
So the answer is Yes, a faulty surge tank cap will result in the loss of coolant and therefore lead to overheating.
The most common overheating problem with the Northstar engine is a blocked purge line(small hose).The purge line is designed to purge air out of the cooling system.
There is a small diameter hose coming from near the top of the coolant tank (not the cap) ,this is the purge line.
With the engine idling,pull the purge line from the tank,if there is no coolant flow from this small hose,it is blocked and this will cause overheating.
If the hose is clear, check for blockage at the nipple on the tank.Or trace the hose back until you find the blockage.
The hose goes in to the engine to a crossover and comes out the other side close to the thermostat housing,the blockage may be there.
If by "coolant cap" you mean the radiator cap then yes. This cap is supposed to be pressure release valve besides capping the opening. It maintains a certain pressure in the coolant system. When there is not enough pressure maintained inside the coolant system, circulation is hampered and thus overheating is caused. So, please replace with the correct one as you had earlier. While if you mean the cap on the coolant reservoir, then that has no connection with the coolant circulation and thus overheating.
No. A faulty cap can not cause overheating.
SOURCE: what can cause overheating in a 2000 pontiac sunfire
Replace the thermostat. It will be fine after that. I know thats what everyone says anytime there is an overheating problem but in this case with the way the system works and it has been working fine up to this point, it's gonna be the thermostat.
SOURCE: Overheating what could be the causes? Trying to
if it looks like mayonnaise either on the oil cap or radiator cap you will have a blown head gasket. don't run it or bigger problems will occur.
SOURCE: Can a worn coolant reservoir cap cause a 2002
I would check to see if the hose has fallen off the reservior container, if this occurs the
engine will vent coolant and get an air pocket and run hot. (This happened recently on
my S-10 pickup) The hose had fallen behind the battery and did not appear out of place.
I would also suspect the thermostat sticking as a secondary culprit if no air pocket exists
in the engine block. The reservior tank holds liquid to be drawn back into the engine as
it heats up and cools down and should never be completely empty. Hope this is helpful.
Car overheats and Air blows hot at idle?
http://howtobyme.blogspot.com/2011/11/car-overheats-and-air-blows-hot-at-idle.html
------------
CAR OVERHEATING
There
are many possibilities for car overheating.
Faulty
thermostat clogged radiator/plugged radiator, radiator hose worn out. Coolant
running low. Low coolant pressure. Faulty temperate sensor.
I
suggest you to go through the troubleshooting details mentioned in the link
below:-----
All types of car overheating problems and troubleshooting?
http://technoanswers.blogspot.com/2011/11/all-types-of-car-overheating-problems.html
----------
These will help.
Thanks.
Hello and welcome to FixYa!
If you have overheating problem, it can lead to multiple
issues. You may be running on low coolant that's why the vehicle overheats. If
that's the case, please add coolant and make sure that it sits on the right
level, too much coolant can cause overheating too for coolant will overflow.
The vehicle may have a faulty or worn out radiator blower
motor that's why it overheats. If that's the case then you will need a blower
motor replacement to resolve the issue.
If the radiator is clogged with dirt and rusts this issue
occurs too. The coolant doesn't flow normally on the cooling system if it's
clogged. If that's the case, I strongly suggest that you have the radiator
flushed to drain out dirt and rusts. If you think that the radiator served you
enough then it's better to have it replaced.
Please do check the radiator hoses, If you have worn out
hoses it can cause coolant leakage which can result to overheating. A tiny hole
is good enough for the vehicle to overheat.
A faulty thermostat sensor can cause the issue too. If you
have worn out thermostat, the fan may not trigger that's why the fan won't work
when under stressed conditions. A blown radiator blower fuse can cause this
issue too so I suggest that you check the radiator blower fuse and replace it
when necessary.
Hope you find this information helpful enough and thank you for using FixYa! Have a good one!
Hello and welcome to FixYa!
If you have overheating problem, it can lead to multiple
issues. You may be running on low coolant that's why the vehicle overheats. If
that's the case, please add coolant and make sure that it sits on the right
level, too much coolant can cause overheating too for coolant will overflow.
The vehicle may have a faulty or worn out radiator blower
motor that's why it overheats. If that's the case then you will need a blower
motor replacement to resolve the issue.
If the radiator is clogged with dirt and rusts this issue
occurs too. The coolant doesn't flow normally on the cooling system if it's
clogged. If that's the case, I strongly suggest that you have the radiator
flushed to drain out dirt and rusts. If you think that the radiator served you
enough then it's better to have it replaced.
Please do check the radiator hoses, If you have worn out
hoses it can cause coolant leakage which can result to overheating. A tiny hole
is good enough for the vehicle to overheat.
A faulty thermostat sensor can cause the issue too. If you
have worn out thermostat, the fan may not trigger that's why the fan won't work
when under stressed conditions. A blown radiator blower fuse can cause this
issue too so I suggest that you check the radiator blower fuse and replace it
when necessary.
Hope you find this information helpful enough and thank you for using FixYa! Have a good one!
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