Engine - Overheating Diagnosis (M/T Only)
87hyundai02Group: ENGINE
Number: 015
Date: NOVEMBER, 1987
Model: EXCEL
Subject
ENGINE OVERHEATING (MANUAL TRANSMISSION MODELS ONLY)
Some 1987 Excels equipped with manual transaxle (M/T) and air conditioning (A/C) may exhibit abnormally high coolant temperatures under severe operating conditions (heavy traffic, mountain roads, extensive idling) in high ambient temperature areas, generally 100~F or above.
This bulletin contains information regarding the proper diagnosis and corrective actions for this condition.
DIAGNOSIS
1. Visually inspect the vehicle for any non Hyundai approved accessories that may restrict air flow to the radiator, such as grilles with fog lights and aftermarket bras.
2. Confirm that the vehicle temperature gauge is operating above the normal range as shown in the 1987 Owners Manual (see below).
3. Check that the coolant is full in the radiator and to the full mark on the coolant recovery tank.
4. Test the coolant specific gravity to assure a 30%-60% mix of antifreeze to water.
5. Check that the cooling fan is operating and turning the proper direction. It should draw air through the front grill.
6. Pressure test the cooling system and the pressure cap. Both should hold 11-15 psi.
NOTE: A slow leak in the cap or system can cause aeration of the coolant and a loss of cooling efficiency.
7. Test the air conditioner pressures to assure they are within specification. An over charged air conditioner can cause overheating.
8. Test the thermostat for proper opening temperature. (190~F begin opening, .31 in. fully open at 212~F).
9. Check timing and idle speed adjustments.
If all of these items have been checked and the vehicle still operates above the normal range, proceed with installation of the hot weather cooling system kit.
REMOVAL PROCEDURE
NOTE: Before replacing any parts, remove the new front transverse filler assembly from the repair kit and have it painted the same body color of the vehicle to be repaired.
1. Record the preset radio stations and then disconnect the battery ground cable.
2. Loosen the radiator drain plug and drain the coolant from the radiator.
3. Remove the radiator grille. (See TSB016 in Body Section)
(FIGURE 1):
4. Remove the old front transverse filler assembly from the vehicle and discard (Figure 1)
5. Disconnect the fan motor harness connector.
(FIGURE 2):
6. Disconnect the upper radiator hose from the radiator. (Figure 2)
7. Remove the blower assembly from the radiator.
NOTE: Retain the 4 blower assembly attaching bolts, as they will be used to install the new blower assembly.
8. Remove the thermo switch from the radiator bottom tank.
REASSEMBLY PROCEDURE
1. Install the new thermo-switch in the radiator.
2. Install the new blower motor assembly to the radiator.
3. Connect the fan motor harness connector.
(FIGURE 3):
4. Reinstall the upper radiator hose. (Figure 3)
(FIGURE 4):
5. Install newly painted transverse filler panel. (Figure 4)
6. Install radiator grille.
(FIGURE 5):
7. Install the air guide as shown. A = Spring Clips (provided) B = Grill Support Bolts (Figure 5)
8. Fill cooling system and overflow tank with clean coolant mixture of 50% Antifreeze.
9. Reconnect battery cable. Reset radio station preset buttons to previously recorded frequencies and clock.
10. Road test vehicle and assure that condition has been corrected.
5. PARTS INFORMATION
Key NO Part Number Part Name Qty Remark
1 2F310-21950 Hot weather cooling kit 1 for M/T
2 25380-21950D Blower ass'y 1
3 25360-21200D Thermo switch ass'y 1
4 86370-21001 Transverse filler 1
5 86360-21150 Air guide 1
6 82216-31100 Clip-door belt outside 3
6. Warranty Information
Operation Code: 25306R0F
Labor Time Standard: 1.5 Hr.
The above operation will include the time for the replacement of Transverse Filler, Fan & Motor ASSY, Thermo SW ASSY, Air guide and clip, and also painting of Transverse Filler.