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Does the car have any other relay or fusses in other place?
Have you checked under the dashboard yet? Today's cars and trucks have two fuse boxes. The first is on the driver's side of the vehicle, usually under the kick flap to the left of the brake pedal. There should be a pop-off cover or box located on the firewall that contains a number of fuses. It isn't likely to be a fuse fault, though.
It sounds like you are experiencing problems with a thermocouple style switch. In other words, when the the switch or device reaches a certain temperature, it switches off.
To find this particular device, you will have to obtain a service manual for the electrical and fan systems and then you will have to find the diagrams that cover the fan. Study them and you will likely find that there is a special symbol there that shows there is a heat-activated or thermocouple switch. If you identify it and feel comfortable handling the job, remove the old switch and swap in a new one. The chances are good that this is the whole problem. I honestly doubt it was a fuse in the first place.
One other suggestion is this, look to see if there might not be a cooling system switch that handles this function. You'll need the service manual for that, too.
on Jul 02, 2015
DIRECTION FOR THERMOSTAT REPLACEMENT FOR A 1998 MONTANA
The exact location of the thermostat varies depending on the particular engine
model on your Pontiac Montana. Although 2.0L turbo and non-turbo engines locate the thermostat on the upper section of the engine, other models may follow the lower radiator hose to a lower position on the engine, requiring the removal of one or more components for replacement. see below
- Park your car in a safe place and open the hood.
- 2Locate the thermostat housing by following the upper or lower radiator hose from the radiator towards the engine. The end of the hose should be connected to an aluminum or metal housing attached to the engine by two mounting bolts.
- 3Remove the air cleaner duct assembly and the crossover exhaust pipe, if necessary, using a wrench and ratchet and socket.
- 4Place a drain pan underneath the radiator drain valve. Open the valve and drain some of the coolant to empty the radiator hose; then close the valve.
- 5Remove the radiator hose from the thermostat housing by disconnecting the clamp using a pair of rib joint pliers, Phillips screwdriver or ratchet and socket, depending on type of clamp used on your particular model; then remove the hose.
- 6Remove the two thermostat housing bolts and lift the housing off the engine. Before removing the thermostat off the engine, pay careful attention to the position of the relief valve on the thermostat in relation to the mounting base on the engine, looking for any special marks. The new thermostat has to be mounted in this same exact position. Also, note that the thermostat spring has to point towards the engine once it is seated on the engine; then remove the thermostat and any gasket material if necessary.
- 1Clean the thermostat housing and engine mounting surfaces from gasket material, if necessary, using a plastic scraper; also, clean the bolt threads of the thermostat housing bolts of sealer, if necessary, using a wire brush.
- 2Apply a light coat of Room Temperature Vulcanizing (RTV) sealer to the new paper gasket if your particular model requires one; or install a new O-ring to the center of the thermostat; also, apply a light coat of RTV sealer to the threads of the thermostat housing mounting bolts.
- 3Install the new thermostat on the engine mounting base in the same exact position as the old one; install the paper gasket if required and set the thermostat housing in place. Start the housing mounting bolts by hand and then tighten the bolts.
- 4Connect the radiator hose to the thermostat housing; then install the crossover exhaust pipe and air cleaner and duct assembly, if necessary. Fill the radiator with new coolant, start the engine and let it reach operating temperature. Check for leaks and add more coolant to the reservoir to bring the level between the Add and Full Hot marks and turn off the engine.
- 5Bleed the cooling system if the thermostat housing is provided with a valve screw on it. Once the engine reaches operating temperature, loosen the valve screw until coolant begins to leak through the screw; then tighten the screw again
Read more: How to Change a Pontiac Montana Thermostat ' eHow.com http://www.ehow.com/how_4900141_change-pontiac-montana-thermostat.html#ixzz1eRUgRlYC
on Feb 15, 2015
Sender is either stuck or has a bad connection on it but you will have to test the wiring and gauge to be sure.
on Dec 30, 2014
1998 Pontiac Montana Transport Radio and Temp Displays are out
don't know if you have had any luck yet.. the radio displays on those older gm cars do just simply fail , I have had 4 in that 96 to 99 time frame and each one just quit suddenly. I believe as crazy as it sounds that the display runs thru the radio. gm did this in all their newer cars in 2000 and up ..they use a data cable that runs thru the radio and feeds half the dash ..
on Dec 20, 2014
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