2000 Astro overheating

A 2000 Astro. Been losing coolant for about a month, i thought it was a leak but never saw a puddle. yesterday overheated. looks like its right behind the alternator. thinking its the thermostat. how do i get
to it. i've tried b4 and i cant figure out how to remove the doghouse.
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See thermostat and air cleaner assembly removal procedures below:
Document ID# 604158 2000 Chevrolet/Geo Astro - 4WD
-------------------------------------------------------------------------------- Thermostat Replacement
Removal Procedure
Caution In order to avoid being burned, do not service the engine while it is still hot. Service the engine when it is cool.
Drain the coolant to a level below the thermostat. Refer to Draining and Filling Cooling System . Remove the air cleaner assembly. Refer to Air Cleaner Assembly Replacement in Engine Controls.
Disconnect the ground lead from the coolant outlet. Remove the bolt/stud and the bolt on the coolant outlet. Remove the coolant outlet. Remove the thermostat. Clean all of the parts and the sealing surfaces.
Installation Procedure
Install the thermostat. Install the coolant outlet.
Notice Use the correct fastener in the correct location. Replacement fasteners must be the correct part number for that application. Fasteners requiring replacement or fasteners requiring the use of thread locking compound or sealant are identified in the service procedure. Do not use paints, lubricants, or corrosion inhibitors on fasteners or fastener joint surfaces unless specified. These coatings affect fastener torque and joint clamping force and may damage the fastener. Use the correct tightening sequence and specifications when installing fasteners in order to avoid damage to parts and systems.
Install the bolt and the bolt/stud. Tighten Tighten the bolt and the bolt/stud to 25 Nm (18 lb ft). Install the ground lead to the bolt/stud. Install the air cleaner assembly. Refer to Air Cleaner Assembly Replacement in Engine Controls. Refill the coolant. Refer to Draining and Filling Cooling System . Start the engine. After the engine reaches normal operating temperature, check for coolant leaks.
Document ID# 558172 2000 Chevrolet/Geo Astro - 4WD --------------------------------------------------------------------------------
Air Cleaner Assembly Replacement
Removal Procedure
Caution Before servicing any electrical component, the ignition key must be in the OFF or LOCK position and all electrical loads must be OFF, unless instructed otherwise in these procedures. If a tool or equipment could easily come in contact with a live exposed electrical terminal, also disconnect the negative battery cable. Failure to follow these precautions may cause personal injury and/or damage to the vehicle or its components.
Disconnect the negative battery cable. Remove the air cleaner cover by releasing the retainer clips. Remove the air cleaner element. Disconnect the MAF sensor harness connector. Remove the air cleaner cover and MAF sensor by loosening the hose clamp. Clear out any debris in the air cleaner tub. Remove the air cleaner tub by pulling upward on the tub until the mounting grommets are free from the mounting studs.
Installation Procedure
Install the air cleaner tub by pressing downward on the tub until the grommets are seated on the mounting studs. Insert the air cleaner element into the air cleaner tub.
Notice Use the correct fastener in the correct location. Replacement fasteners must be the correct part number for that application. Fasteners requiring replacement or fasteners requiring the use of thread locking compound or sealant are identified in the service procedure. Do not use paints, lubricants, or corrosion inhibitors on fasteners or fastener joint surfaces unless specified. These coatings affect fastener torque and joint clamping force and may damage the fastener. Use the correct tightening sequence and specifications when installing fasteners in order to avoid damage to parts and systems.
Install the air cleaner cover and MAF sensor. Tighten Tighten the clamp to 4 Nm (31 lb in) Install the air cleaner cover. Fasten the air cleaner cover retainer clips. Connect the MAF sensor harness connector. Connect the negative battery cable.

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I don't think you got your original question answered. To remove the doghouse there are two screws that go into it from inside the engine compartment. They are like a spring loaded screw and take just a couple of turns to release them. If you unscrew these and release the lower clamps inside the van, and if I can recall remove the glove compartment? It should then pull out of the way.

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Sorry, I didn't know what you were referring to as a "doghouse." Do the following procedures help any?
Document ID# 474868 2000 Chevrolet/Geo Astro - 2WD -------------------------------------------------------------------------------- Drive Belt Replacement
Removal Procedure
Remove the air cleaner assembly. Refer to Air Cleaner Assembly Replacement in Engine Controls. Remove the air cleaner outlet duct from the throttle body. Refer to Air Cleaner Outlet Duct Replacement in Engine Controls. Install a 3/8 inch drive wrench on the drive belt tensioner arm and rotate the arm counterclockwise. Remove the drive belt. Slowly release the tension on the drive belt tensioner arm.
Installation Procedure
Route the belt over all the pulleys except the tensioner arm. Observe drive belt routing for vehicles without air conditioning. Observe drive belt routing for vehicles with air conditioning. Install a 3/8 inch drive wrench on the drive belt tensioner arm and rotate the arm counterclockwise. Install the drive belt over the drive belt tensioner pulley. Slowly release the tension on the tensioner arm. Inspect for the drive belt being properly installed on the pulleys. Avoid mis-positioning the drive belt by one or more grooves.
Confirm for the proper drive belt size and the correct drive belt routing by observing the location of the fix pointer and the index marks on the drive belt tensioner. With a new drive belt installed, the fix pointer should align within the indentation on the drive belt tensioner.
With a used drive belt installed, the fix pointer should not align past the index mark. Install the air cleaner outlet duct. Refer to Air Cleaner Outlet Duct Replacement in Engine Controls. Install the air cleaner assembly. Refer to Air Cleaner Assembly Replacement in Engine Controls.
Document ID# 558176 2000 Chevrolet/Geo Astro - 2WD -------------------------------------------------------------------------------- Air Cleaner Outlet Duct Replacement
Removal Procedure
Caution Before servicing any electrical component, the ignition key must be in the OFF or LOCK position and all electrical loads must be OFF, unless instructed otherwise in these procedures. If a tool or equipment could easily come in contact with a live exposed electrical terminal, also disconnect the negative battery cable. Failure to follow these precautions may cause personal injury and/or damage to the vehicle or its components.
Disconnect the negative battery cable. Remove the engine cover. Refer to Engine Cover Replacement in Interior Trim. Remove the air cleaner outlet retaining nut (1). Remove the air cleaner outlet duct (2) from the throttle body assembly. Disconnect the IAT sensor harness connector. Loosen the air cleaner outlet duct from the MAF sensor. Remove the air cleaner outlet duct.
Installation Procedure
Notice Use the correct fastener in the correct location. Replacement fasteners must be the correct part number for that application. Fasteners requiring replacement or fasteners requiring the use of thread locking compound or sealant are identified in the service procedure. Do not use paints, lubricants, or corrosion inhibitors on fasteners or fastener joint surfaces unless specified. These coatings affect fastener torque and joint clamping force and may damage the fastener. Use the correct tightening sequence and specifications when installing fasteners in order to avoid damage to parts and systems.
Install the air cleaner outlet duct to the MAF sensor. Tighten Tighten the clamp to 4 Nm (35 lb in). Connect the IAT sensor harness connector. Install the air cleaner outlet duct (2) on the throttle body assembly. Tighten the retaining nut (1). Tighten Tighten the nut 2 Nm (18 lb in). Install the engine cover. Refer to Engine Cover Replacement in Interior Trim. Connect the negative battery cable.
Document ID# 605969 2000 Chevrolet/Geo Astro - 2WD -------------------------------------------------------------------------------- Engine Cover Replacement
Removal Procedure
Remove the instrument panel extension. Refer to Instrument Panel (I/P) Extension Replacement in Instrument Panel, Gages and Console. Remove the floor air outlet duct. Refer to Air Outlet Replacement - Center Floor in Heating, Ventilation and Air Conditioning. Remove the bolts from the brackets: Loosen the bolt. Rotate the bracket out of the way. Remove the latches. Remove the screws. Remove the engine cover.
Installation Procedure Install the engine cover. Install the screws to the engine cover. Do not fully tighten the screws. Install the latch screws. Tighten Tighten the latch screws to 4 Nm (35 lb in). Install the engine cover bolts to the brackets. Tighten Tighten the engine cover bolt to 25 Nm (18 lb ft). Insert the floor air outlet duct. Refer to Instrument Panel (I/P) Extension Replacement in Instrument Panel, Gages and Console. Insert the instrument panel extension. Refer to Air Outlet Replacement - Center Floor in Heating, Ventilation and Air Conditioning.
Document ID# 292450 2000 Chevrolet/Geo Astro - 2WD -------------------------------------------------------------------------------- Instrument Panel (I/P) Extension Replacement
Removal Procedure
Remove the caps that cover the extension screws. Remove the screws from the extension. Remove the nuts at the bottom of the extension. Pull toward the rear of the vehicle in order to remove the extension from the instrument panel. Disconnect the electrical connectors.
Installation Procedure
Connect the electrical connectors. Install the extension to the instrument panel: Align the retainers. Press the extension into place until the retainers are seated. Install the nuts that retain the extension to the floor. Tighten Tighten the nuts that retain the extension to the floor to 8 Nm (71 lb in). Install the retaining screws. Tighten Tighten the screws to 8 Nm (71 lb in). Install the extension screw covers.
Document ID# 605921 2000 Chevrolet/Geo Astro - 2WD -------------------------------------------------------------------------------- Air Outlet Replacement - Center Floor
Removal Procedure
Remove the IP extension. Refer to Instrument Panel (I/P) Extension Replacement in Instrument Panel, Gages, and Console. Remove the floor air outlet duct from the air distributor. Remove the bucket seats. Refer to Seat Replacement - Bucket in Seats. Remove the front section of the carpet, if equipped. Refer to Mat/Carpet Replacement - Front Floor in Interior Trim. Remove the retaining nuts from the floor outlet duct, if equipped. Remove the floor air outlet from the ducts to the rear seat, if equipped.
Installation Procedure
Install the floor air outlet to the ducts to the rear seat, if equipped.
Notice Use the correct fastener in the correct location. Replacement fasteners must be the correct part number for that application. Fasteners requiring replacement or fasteners requiring the use of thread locking compound or sealant are identified in the service procedure. Do not use paints, lubricants, or corrosion inhibitors on fasteners or fastener joint surfaces unless specified. These coatings affect fastener torque and joint clamping force and may damage the fastener. Use the correct tightening sequence and specifications when installing fasteners in order to avoid damage to parts and systems.
Install the retaining nuts to the floor outlet duct, if equipped. Tighten Tighten the nuts to 2 Nm (18 lb in). Install the front section of the carpet, if equipped. Refer to Mat/Carpet Replacement - Front Floor in Interior Trim. Install the bucket seats. Refer to Seat Replacement - Bucket in Seats. Install the floor air outlet duct from the air distributor. Install the IP extension. Refer to Instrument Panel (I/P) Extension Replacement in Instrument Panel, Gages, and Console.

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