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Re: check engine light on
Heater temp is a bit low but I don't know what the ambient temp was when you tested (the colder the outside air, the cooler the blower temp will be.) I'd definitely change the thermostat before doing anything else. Todays engines run @ about 210 degrees. If you've got a 160 thermostat in there, it won't ever get there. (will also mess with mpg.) Even the cheapest manuals contain locations for stuff like that. Everyone keeps changing locations, and I haven't worked on this stuff for a while, so I can't give you a location. Yes there are other possible causes to your problem (blend doors etc) but I'd stick to the simple common stuff first!
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Have the coolant temperature sensor checked or replace.
That sensor is tied in with the cooling fans. When the coolant temp increases it turns on the fan.
It is usually located around the thermostat housing or screwed into the engine block with a 2 or 3 wire connector on it.
Hi my name is Tom and I can help you. All manufacture res of coolant make the same coolant. There are standards set my government. I use Prestone, but andy coolant will do. I trust this is helpful to you.
The CEL (Check Engine Light) will not go out until you hook up a OBD II scanner to your vehicle and erase the code. If it comes back again after you erase it than either the original problem still exists or you have a new problem. You can go to your local AutoZone store and they can hook up a scanner and erase your code for free.
Check "maintenance" Or other headings that are similar. Using a Haynes manual? Sometimes their stuff is all over the book and not where you'd expect it to be. To relieve fuel pressure find if you have a schrade valve (looks like a tire valve) under a cap on the fuel rail. Put a rag under it and cover the top so it does not spray. Generally to keep system from becoming air bound, fill with engine running and heater on high, allow for thermostat to open and top off when level drops.
From the looks of it this is a very common problem with the 2002-2003 saturn vue. There was a Technical Service Bulletin from saturn about the problem, which means it happens alot but not quite enough to warrant a recall.
You need to replace your thermostat and it is a pain to do, the dealership will charge you about 2 hours flat rate to put it in.
Its not a huge deal to get it replaced right away, but the computer depends on the vehicle being a certain temperature and if it isn't then your performance/emissions will suffer.
Its on the drivers side of the engine below the intake manifold. Why do you want to replace it? I have worked with the VUE since day one and I have yet to see a bad coolant temp sensor. If you are having trouble with the engine temperature or the amount of heat in the car a very common cause is the thermostat sticking open and not alowing the engine to reach operating temperature. The most common telltale to this condition is usually the service engine soon light is on with a p0128 code stored in the PCM.