How do I Replace the thermostat on a 2002 GMC Envoy. Also, if the top radiator hose in hard with pressure, is this an indication the thermostat is bad? Is the thermostat located on the engine end of the top radiator hose?
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hey my friend the thermostat in not like others its a real pain here is exactly what you have to do if u have the 4200 vortec How to replace thermostat 4 2 envoy or trailblazer
btw in case u was wondering or did not know the trailblazer and envoy is the same
remove upper radiator hose.. if you trace it back to the engine, you will see the thermostat housing.. should be two bolts.. make sure when you reinstall you clean the surface good, and re applicate with gasket sealer, or gasket..
There may be a bad wire somewhere. I would check first the the thermostat and its wiring for exposed conductor or bad insulation or wires in contact with metal or other wires. The thermostat is located at one of the radiator hoses. It looks like a plug from the outside and has wires connected to it.
Just replaced my 2005 envoy thermostat, and it might be the same. Here is what I had to do.
1. First, the thermostat was located on the driver side behind the alternator. The hose comes from the bottom of the radiator, not the top like most vehicles I have worked on.
2. You need to remove the belt by taking tension off of it. The tensioner is on the passenger side, under the steering pump. I used a socket wrench, placed in in the square hole on the tensioner, attached a pipe for leverage to the socket, and pulled until the belt was loose.
3. Next is removing the alternator. Best if you first disconnect your battery, as there is a hot line to the alternator. Disconnect the wiring harness located on the top. Remove the bracket bolts that hold the alternator. You might want to place something under the alternator to prevent it from damaging the small wheel under it as it will be heavy and free after you remove the bolts. I also removed the bracket to get full access to the hose and thermostat. There is a red wire that connects to the alternator, remove it and now the alternator can be pulled out and set to the side.
4. Once all this is out of the way, you can remove the hose to the thermostat (I assume you have drained the radiator).
5. Remove the two bolts hold the thermostat to the engine.
6 Replace the thermostat and reverse the order of the steps above.
I read that some can do this without removing the alternator or just loosening, but it is tight and makes the job a lot harder.
It's actually very simple. Follow the upper radiator hose to the top of the engine block. You will see a housing which the hose is attached to. Remove the hose from the housing. The housing will have 2 or 3 bolts holding it down. Remove the bolts and lift the housing off. The thermostat will be sitting there and you simply need to remove it.
its behind and below the alternator follow the top radiator hose down to it.the alternator has to come off.then you will see t-stat housing the t-stat is built in the housing so your part store should have this housing and stat together.there are two 10mm bolts that hold on housing the bottom one is hard to see.most shops will do this job for about$ 200 .
That code represents a lower than expected reading for temperature (coolant). First thing to do is check your coolant level, as if it is low, then the sensor can not read correctly. Second, you may have a thermostat that is stuck open, allowing the coolant to cool off too much. The sensor should be mounted on top of the engine, near the thermostat housing.