Had to replace a thermostat on my Mazda 3, 2.0L, 2007 which required me to remove the drive belt. Upon reinstalling the belt (original) was to long for the tensioner to work. I did not miss any pullies as the drive belt only goes around the crankshaft, waterpump (smoothpart), alternator, and tensioner. Your assistance would be appreciated. Thanks

I need help replacing my thermostat on my 2004 Mazda

JustAnswer https://www.justanswer.com > Mazda Repair
Dec 2, 2015 - The thermostat housing is bolted with 3 bolts to the end of the head closest to the drivers side fender. Thanks for letting me assist you. I ...

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Thermostat replacement Mazda Tribute 2001 - 2011

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Free advice from Haynes' master mechanics. Full repair guide available for this vehicle. Save time and money with the experts at Haynes.

Need to replace thermostat in my 2005 mazda tribute 2.3.

JustAnswer https://www.justanswer.com > Mazda Repair
Oct 20, 2022 - 1. Drain the engine coolant. 2. Remove the accessory drive belt tensioner. 3. Remove the thermostat and thermostat housing assembly. ^ Loosen ...

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How to change MAZDA TRIBUTE Thermostat

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Illustrated step-by-step manuals and video tutorials on replacing MAZDA TRIBUTE Thermostat will tell you how to carry out DIY replacement of parts and ...

Mazda Tribute Thermostat Housing Pipe Water Outlet V6 ...

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Nov 22, 2023 - Mazda Tribute Thermostat Housing with a Replacement Warranty of 3 Years. Our Video Tutorials allow people to save Thermostat replacement cost.
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Get a service manual. Chilton or Haynes. Under $20.00

The usual reason is the belt that drives the A/C compressor is loose. Sometimes the issue is a tensioner pulley bearing is worn out. May also be the belt that drives the alternator. When the extra load of the compressor or the current to drive the A/C fans engages, the belt will slip and squeak. Adjust or replace the belt(s).

Can't you just unplug the ac unit and keep the same belt? that would save you from having to change the original belt. which will make it a lot easier then trying to re-invent the wheel.

REMOVE DRIVE BELT-REMOVE TRANVERESE MEMBER-REMOVE FRONT EXHAUST PIPE-REMOVE FRONT CV AXLE-DISCONECT WIRES AND REMOVE ALTERNATOR-REV TO REINSTALL

2005 Mazda Mazda3 2.3L MFI DOHC 4cyl

1. Before servicing the vehicle, refer to the precautions section.
2. Disconnect the negative battery cable.
3. Drain and recycle the engine coolant.
4. Remove the drive belt.
5. Remove the power steering pump with hoses and pipe still connected. Position the P/S oil pump out of the way.
6. Disconnect the water hose and lower radiator hose from the thermostat.
7. Remove the thermostat retainers, thermostat housing, thermostat and gasket.
   

To install:

1. Installation is the reverse of removal. Use a new thermostat housing gasket and tighten the thermostat housing retainers to 71-101 in. lbs. (8-11.5 Nm).
2. Fill the cooling system and check for leaks.

Hope helps (remember to rate and comment this).

Please see my tip at http://www.fixya.com/cars/r5929960-s_thermostat .

The thermostat is on the front of the engine by the drive belt. Sorry I do not have a picture, but the thermostat is inside a housing that is held on by 2 or 3 bolts and has a heater hose connected to it.

1. Drain and recycle the engine coolant.
   
2. For 2.5L engines, remove the accessory drive belt tensioner.
3. Disconnect the heater hose and position out of the way.
4. Remove the thermostat housing.
5. Remove the three bolts and separate the water outlet adapter from the thermostat housing.
   NOTE The thermostat is indexed and must be installed correctly.
   
6. Remove the thermostat and the O-ring seal.
   NOTE Clean and inspect the sealing surfaces.
   
7. To install, reverse the removal procedure. Torque all fasteners to 89 inch lbs. (10 Nm).

Click on the following free direct Link. It has several Diagrams including the correct Serpentine/Drive Belt Diagram for your 1998 Mazda Millenia based upon your Engine Size and unspecified Engine Options.
Included are Instructional and Directional Diagrams on the locations of the various Adjustment Bolts/Nuts which will have to be loosened in order to remove the Belts; and tightened in order to reinstall the Belts.

http://www.2carpros.com/car_repair_information/year/1998/make/mazda/model/millenia/1998_mazda_millenia_drive_belt_routing_diagram.htm

removal:
1. remove ribbed drive belt
2. lossen toothed timing belt as required (it is not necessary to remove toothed timing belt)
3. unbolt thermostat housing and pull out from below toothed belt

install

the vent valve must be facing up (arrow)
reverse order of removal

Remove negative (-) battery terminal from battery. Remove drive belt from alternator pulley. Remove wiring harness (electrical connections) from alternator. Remove attaching bolts for alternator. Pry out alternator. Reverse steps to reinstall.