Where is the location of thermostat on a Pontiac transport Montana?

Answer 1

Looking at the ( 3400 )engine from the front, you need to look underneath of the throttle body and its ducting. It's not a fun thing to get at, but it's reasonable to get at when you take the time to block out the parts it is hidden under. The temperature sensor is right there as well. You won't hurt anything by removing the throttle body right back to the air cleaner housing, JUST TAKE YOUR TIME AND BE REASONABLY GENTLE WITH IT, because if you get too rough with it, you can do some damage. There are some wire plugs to disconnect with clips you spring away from the connectors, some hose clamps, and some rubber ducting to remove. You might not want to remove the throttle body because you need to deal with the linkages as well. Once you get all that out of the way, you'll be able to see a housing with a large radiator hose connected to it. The thermostat is inside of that housing. It is a miserble thing to get your wrenches in to remove the housing with out removing the exhaust cross over pipe,but it is definitaly do-able, I didn't remove it. As with any thermostat standing on its side as these are, you need to make sure it stays in place in the housing as you are reassembling it. Other wise you can literally break the housing if it comes out of place. If the bolts go in with out being forced, and the housing comes together smoothly, you have succeeded. The net issue is that the thermostat is of course one with a special feature that the cheaper ones don't have. Once they have been over heated they will never close again. It's sort of like a fusable link that melts open. I simply compared the physical characteristics of the $30.00 one and $16.00 ones and bought the cheap one. I've driven that engine for many thousands of miles since with no ill effects.