I changed the thermostat...a 99 pontiac montana is overheated still whats the problem?
Check for leaks , pressure test radiator to pressure on cap, gauge must hold pressure for several minutes, if no leaks release pressure, leave gauge in place, start and run engine , if pressure rises on gauge faulty gasket or cracked head, if ok the radiator core may be partly blocked . Reverse flush may cure this.
You have a GM common problem and that is a bad intake manifold gasket. GM change the gaskets to plastic and they crank and leak causing over heating. here is a picture of one i took from a 2005 pon. bonneville with 74,000 miles on it
GM trouble leaking gaskets.IN side or OUT side.I try on 99 grand am HEAD GASKET FIX for $30.00 work well,two years no leak.
Check your fan if yo replaced your thermostat see if your fan is on
SOURCE: 2002 Pontiac Montana Thermostat replacement
check the coolant level fiirst...if that is low it wont give you any heat.....to change the thermostat you have to follow the top radiator hose to the engine.at the send of it you will see a clamp take it loose...then you will see the thermostat housing its held in place by 2 bolts . once you remove them you have the thermostat....make sure you clean all the old gasket material off both the housing and mount.also make sure you get a new gasket.
SOURCE: Pontiac Montana '99 Water Thermostat removal
Yes, it can be removed and run without the thermostat. However, your gas mileage will suffer and the heater may not work very well.
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