Question about Vauxhall Cars & Trucks
Car has been parked up for a while,
Thermostat failing will need to be changed. may be stuck open abit and not moving. change this and re full water and leave top off and get engine to temp and squeeze the pipes to help get any air out. keep topping up the water bottle. when fan kicks in turn off and leave to cool down. then top up and check the engine on a run see if that has fixed the problem. if no heat coming out then there is still some air in the system make sure it is open and on setting one on fan motor no higher.
Posted on Oct 16, 2013
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Posted on Jan 02, 2017
SOURCE: car runs hot
CHECK YOUR RELAY IN YOUR FUSE BOX UNDER THE HOOD ON THE DRIVERS SIDE INNER FENDER. THE A/C AND THE HEATER RELAY ARE SAME. CHECK AND SEE IF THE A/C REALY WORKS BY TURNING ON YOUR A/C SWITCH. THE ELECTRIC FAN SHOULD START RIGHT AWAY. OTHERWISE YOU HAVE TO WAIT TILL THE ENGINE ACHEIVES OPERATING TEMP TO KICK THE FAN ON. IF ONE DON'T WORK AND OTHER OTHER DOES... SWITCH THE RELAY AND SEE IF IT WORKS. BEEN THERE AND DONE THAT. $9.00 FOR A NEW RELAY AT CHECKER AUTO PARTS.
Posted on Feb 14, 2009
Hi, XMs were notorious for electrical problems. From what you describe I'm assuming that the engine is not actually overheating. There is an earthing point near the drivers side suspension strut (under the bonnet) which caused many problems.
There are a lot of wires connected to this point and what I used to do was remove the original fitting and connect all the wiring directly to the body using eyelet terminals and the original mounting bolt, making sure you have a good contact with the body by cleaning any corrosion or paint around the contact area.
I did, on another occasion, have a problem with the under-bonnet fusebox causing the oil / stop / temp lights to come on without any reason and it turned out to be a short circuit due to bad assembly at manufacture.
Have you had a diagnosis by a garage with Citroen equipment? It might be worth it now after all the work you've done with no result.Should only be a 1/2 hour charge.
Hope you find a solution. The XM was a car ahead of it's time.
Posted on Sep 19, 2009
Are you sure the thermostat was in the wrong way ?.
The thermostat is located in the bottom hose unlike most conventional cooling systems.
The thermostat in the Northstar engine is a dual action device.
One end of the stem is the Thermostat(obviously) and at the other end is a spring loaded pressure valve(the thinner end).
Make sure the thermostat end is nearest the rubber hose and the pressure valve end is in towards the engine.
Also note that the cooling fans don't come on until the coolant temperature hits around 225 degrees.
During normal highway driving the fans will very rarely come on(if at all) due to constant air flow through the radiator.They will only usually come on in heavy traffic conditions on a hot day.
But......if you have the Air Con switched on, the fans will run all of the time.
For overheating problems consider the following......
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.
Posted on Jul 01, 2010
Testimonial: "Thank you very much for your help. The spring of the thermostat was towards the rubber hose and it was the wrong one. I did have a blockage in the purge line. I also found a small leak somewhere under the crosover pipe. This is my first experience with a northstar 4.6L engine. I realy like the car, I just got to learn how to take care of it. Thank you so much again for your help and if you can tell me any thing else I should know I would be forever greatful. Richard "
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