Engine Cooling System: Other Infiniti Q45 III

PRECAUTIONS FOR SUPPLEMENTAL RESTRAINT SYSTEM (SRS) "AIR BAG" AND "SEAT BELT PRE-TENSIONER"

The Supplemental Restraint System such as "AIR BAG" and "SEAT BELT PRE-TENSIONER", used along with a front seat belt, helps to reduce the risk or severity of injury to the driver and front passenger for certain types of collision. This system includes seat belt switch inputs and dual stage front air bag modules. The SRS system uses the seat belt switches to determine the front air bag deployment, and may only deploy one front air bag, depending on the severity of a collision and whether the front occupants are belted or unbelted.

Information necessary to service the system safely is included in the SRS and SB section of this Service Manual.

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1. After removing the mounting bolts and nuts, separate the mating surface using a seal cutter and remove the old liquid gasket sealing. CAUTION: Be careful not to damage the mating surfaces.
2. In areas where the cutter is difficult to use, use a plastic hammer to lightly tap the area where the liquid gasket is applied. CAUTION: If for some unavoidable reason a tool such as a flat-bladed screwdriver is used, be careful not to damage the mating surfaces.

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1. Using a scraper, remove the old liquid gasket adhering to the liquid gasket application surface and the mating surface. Remove the liquid gasket completely from the groove of the liquid gasket application surface, mounting bolts, and bolt holes.
2. Wipe the liquid gasket application surface and the mating surface with white gasoline (lighting and heating use) to remove adhering moisture, grease and foreign materials.
3. Attach the liquid gasket tube to the tube presser. Use Genuine Thread Sealant or equivalent. Refer to "RECOMMENDED CHEMICAL PRODUCTS AND SEALANTS ".
4. Apply the liquid gasket without breaks to the specified location with the specified dimensions. If there is a groove for the liquid gasket application, apply the liquid gasket to the groove. As for the bolt holes, normally apply the liquid gasket inside the holes. Occasionally, it should be applied outside the holes. Make sure to read the text of service manual. Within five minutes of liquid gasket application, install the mating component. If the liquid gasket protrudes, wipe it off immediately. Do not retighten after the installation. After 30 minutes or more have passed from the installation, fill the engine oil and engine coolant. CAUTION: If there are specific instructions in this manual, observe them.

SPECIAL SERVICE TOOLS

The actual shapes of Kent-Moore tools may from those of special service tools illustrated here.

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1. Check if the reservoir tank engine coolant level within MIN to MAX When engine is cool.
2. Adjust engine coolant if too much or too little.

Leak Check

To check for leakage, apply pressure to the cooling system with a tester.

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1. Testing pressure : 157 kPa (1.6 kg/cm 2 , 23 psi)

CHANGING ENGINE COOLANT

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1. Remove engine undercover with power tool.
2. Open radiator drain plug at the bottom of radiator, and remove radiator cap. Be careful not to allow engine coolant to contact drive belts. When draining all the engine coolant in the system, also perform the following steps.
3. Remove air relief plug on heater hose.
4. Drain engine coolant from both sides of cylinder block when draining all the engine coolant in the system.
5. Check drained engine coolant for contaminants such as rust, corrosion or discoloration. If contaminated, flush engine cooling system. Refer to " «FLUSHING COOLING SYSTEM»(ref-183866-S36931831782005081700000) ".
6. Remove reservoir tank, drain engine coolant, then clean reservoir tank.

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1. Install reservoir tank if removed, and radiator drain plug. Radiator drain plug: : 0.78 - 1.56 N.m (0.08 - 0.16 kg-m, 7 - 14 in-lb)
2. Install cylinder block drain plugs if removed. Apply thread sealant to the thread of cylinder block drain plugs. Use Genuine Thread Sealant or equivalent. Refer to "RECOMMENDED CHEMICAL PRODUCTS AND SEALANTS ". Cylinder block drain plug: :14.7 - 24.5 N.m (1.5-2.5 kg-m, 11 - 18 ft-lb)
3. Fill radiator and reservoir tank to specified level. Use genuine Nissan anti-freeze engine coolant or equivalent mixed with water (distilled or demineralized). Refer to "RECOMMENDED FLUIDS AND LUBRICANTS ". Engine coolant capacity (With reservoir tank): Approximately 9.8 l (10-3/8 US qt, 8-5/8 Imp qt) Reservoir tank capacity: 0.8l (7/8 US qt, 3/4 Imp qt) Pour engine coolant through engine coolant filler neck slowly of less than 2l (2-1/8 US qt, 1-3/4 Imp qt) a minute to allow air in system to escape. When engine coolant overflows air relief hole on heater hose, install air relief plug.
4. Warm up engine to normal operating temperature with radiator cap installed.
5. Run engine at 3,000 RPM for 10 seconds and return to idle speed. Repeat two or three times. Watch engine coolant temperature gauge so as not to overheat the engine.
6. Stop engine and cool down to less than approximately 50°C (122°F). Cool down using a fan to reduce the time. If necessary, refill radiator up to filler neck with engine coolant.
7. Refill reservoir tank to MAX level line with engine coolant.
8. Repeat steps 4 through 7 two or more times with radiator cap installed until engine coolant level no longer drops.
9. Check cooling system for leaks with engine running.
10. Warm up engine, and check for sound of engine coolant flow while running engine from idle up to 3,000 RPM with heater temperature controller set at several position between COOL and WARM. Sound may be noticeable at heater unit.
11. Repeat step 8 three times.
12. If sound is heard, bleed air from cooling system by repeating steps 4 through 7 until engine coolant level no longer drops. Clean excess engine coolant from engine.

Checking Radiator

Check radiator for mud or clogging. If necessary, clean radiator as follows.

1. Be careful not to bend or damage the radiator fins.
2. When radiator is cleaned without removal, remove all surrounding parts such as cooling fan shroud and horns. Then tape the harness and connectors to prevent water from entering.

1. Apply water by hose to the back side of the radiator core vertically down ward.
2. Apply water again to all radiator core surfaces once per minute.
3. Stop washing if any stains no longer flow out from the radiator.
4. Blow air into the back side of radiator core vertically down ward. Use compressed air lower than 490 kPa (5 kg/cm 2 , 71 psi) and keep distance more than 30 cm (11.8 in).
5. Blow air again into all the radiator core surfaces once per minute until no water sprays out.

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1. Attach the spacer to the tip of the radiator plate pliers A. Spacer specification: 1.5 mm (0.059 in) thick x 18 mm (0.71 in) wide x 8.5 mm (0.335 in) long.
2. Make sure that when radiator plate pliers A are closed dimension H"; is approximately 7.6 mm (0.299 in).
3. Adjust dimension H"; with the spacer, if necessary.

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1. Remove upper or lower tanks with SST. Grip the crimped edge and bend it upwards so that SST slips off. Do not bend excessively. In areas where Tool cannot be used, use a screwdriver to bend the edge up. Be careful not to damage tank.
2. Remove sealing rubber.
3. Make sure the edge stands straight up.
4. Remove oil cooler from tank.

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1. Install oil cooler. Pay attention to direction of conical washer.
2. Clean contact portion of tank.
3. Install sealing rubber. Push it in with fingers. Be careful not to twist sealing rubber.
4. Caulk tank in specified sequence with SST. Use pliers in the locations where radiator plate pliers A [SST: KV99103510 (-)] cannot be used.
5. Make sure that the rim is completely crimped down. Standard height "H": 8.0 - 8.4 mm (0.315 - 0.331 in)
6. Confirm that there is no leakage. Refer to " «INSPECTION»(ref-183866-S19532783222005081700000) ".

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1. Apply pressure with SST. Specified pressure value : 157 kPa (1.6 kg/cm 2 , 23 psi) WARNING: To prevent the risk of the hose coming undone while under pressure, securely fasten it down with a hose clamp. Attach a hose to the oil cooler to seal its inlet and outlet.
2. Check for leakage by soaking radiator in water container.

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