Engine Cooling - How To Identify & Service H/D Radiators
83renault22E002
NOVEMBER 1982
L42-M42
HEAVY DUTY RADIATORS Attention: Workshop, Parts Department
Information
This I.S. Note provides the information needed to identify and service Type I and Type II heavy duty radiators used in L42-M42 models.
Type I radiators were used in automatic transaxle models built prior to sequence number W018867 and manual transaxle models built prior to sequence number W021476. Type II radiators were used in automatic and manual transaxle models built after these sequence numbers.
Filing Instructions
Remove and discard the previously published I.S. Note No. 2 from your M.R. 240 manual and insert this new I.S. Note 2E in its place.
FIGURE 1 - TYPE I HEAVY DUTY RADIATOR WITH INTEGRAL (ONE-PIECE) CRIMPING TABS:
FIGURE 2 - TYPE II HEAVY DUTY RADIATOR WITH SEPARATE CRIMPING CLIPS:
Radiator Identification
The two radiator types are most readily identified by the method of attaching the inlet and outlet tanks to the radiator core flange.
On Type I radiators, the inlet and outlet tanks are attached to the core by crimping tabs that are an integral part of the core flange (Fig. 1). On Type II radiators, the tanks are attached to the core with separate crimping clips (Fig. 2).
Radiator Service
Only the Type II heavy duty radiator is supplied for service replacement purposes.
If it becomes necessary to replace a Type I radiator, the identification and replacement procedures outlined in this I.S. Note must be followed explicitly to maintain proper cooling system operation. This is especially important because of the different location and type of cooling fan switch used in the two radiator types.
IDENTIFICATION AND REPLACEMENT PROCEDURES
Radiator Identification
1. Identify the type of radiator in the vehicle. Heavy duty radiators use a shroud with the cooling fan and have a 2-3 inch longer core section. Standard duty radiators do not use any type of shroud.
a. If the vehicle is equipped with a heavy duty radiator, proceed to identification step 2.
b. If the vehicle has a standard duty radiator, refer to the cooling system service procedure in the M.R. 240 manual.
2. Inspect the joint where the heavy duty radiator inlet tank is crimped to the radiator core flange.
a. If the crimping tabs that attach the inlet tank to the flange are an integral (one-piece) part of the flange (Fig. 1), this is a Type I radiator. Refer to the following radiator replacement procedure.
b. If the inlet tank is attached to the core flange with a separate, heavy-gauge steel crimping clip that has a gold color anodized finish on it (Fig. 2), this is a Type II radiator. Refer to the cooling system service procedures in the M.R. 240 manual.
INSTALLING TYPE II HEAVY DUTY RADIATOR IN PLACE OF TYPE I
1. Remove the front underbody shield to gain access to the lower radiator hose.
2. Disconnect the lower hose from the radiator and drain the coolant into a clean container.
3. Disconnect the upper radiator hose from the radiator.
4. Disconnect the A/C low pressure cut-out switch wires.
5. Disconnect the cooling fan switch wires.
6. Disconnect the power steering hose from the clip on the cooling fan bracket.
7. On automatic transaxle models, disconnect the cooler lines from the radiator.
8. Remove the nuts attaching the condenser to the top and bottom of the radiator.
9. Disengage the radiator lower mounting grommets and upper mounting clip and remove the radiator.
10. Install the new washer, P/N 89 33 001 029, on the new cooling fan switch, P/N 89 33 000 779, and install the switch in the front (grille side) of the outlet tank on the new radiator. The outlet tank is on the passenger side of the Type II radiator.
CAUTION: Do not attempt to use the cooling fan switch from a Type I radiator in a Type II radiator. Use a new switch, P/N 89 33 000 779, in Type II radiators only. This switch has a blue color coded protection ring on the electrical connector
11. Transfer the overflow plug to the new radiator.
12. Transfer the cooling fan assembly to the new radiator.
13. Install the radiator upper and lower mounting components on the new radiator.
14. Install the original radiator mounting grommets in the radiator support frame.
15. Reposition the horn and bracket and reroute the cooling fan switch wire harness to accommodate the different location of the new cooling fan switch.
16. Connect the wire harness to the cooling fan switch.
17. Install the radiator and attach the condenser.
18. Connect the power steering hose to the clip on the cooling fan bracket.
19. Connect the A/C low pressure cut-out switch wires.
20. On models with automatic transaxle, remove the intercooler fitting pipe plugs from the new radiator and connect the cooler lines to the intercooler fittings on the outlet tank.
FIGURE 3 - WATER PUMP-TO-FILL HOUSING HOSE ROUTING:
21. Connect the upper and lower radiator hoses to the radiator.
NOTE: Before tightening the hose clamps and refilling the radiator, inspect the routing of the water pump-to-remote fill housing hose (Fig. 3). This hose must be routed under the radiator upper hose to prevent a short fill condition that could result in low coolant levels and possible overheating.
22. Refill the radiator (with the coolant drained previously) as outlined on page B-31 in the M.R. 240 workshop manual.
CAUTION: The cooling system must be filled and purged as outlined in the M.R. 240 manual to ensure proper system operation.
23. Run the engine until the cooling fan cycles "on" and "off."
NOTE: Check all hose connections for leaks while the engine is running and make any necessary connections.
24. On models with automatic transaxle, check and adjust the transmission fluid level as outlined on page F-5 in the M.R. 240 workshop manual.
CAUTION: The fluid level must be checked and adjusted as outlined in the M.R. 240 workshop manual to ensure proper transmission operation.
PARTS: The following parts are required:
Description Quantity Part Number
KIT, TYPE II 1
Heavy Duty Radiator
With Automatic Transmission 89 83 100 001
With Manual Transmission 89 83 100 002
Kit Contents:
Radiator 1
Cooling Fan Switch 1
Cooling Fan Switch Washer 1
S.R.T. INFORMATION
Operation
Operation Description T.I.C. Number S.R.T.
CO. RADIATOR, H.D. COOLING - See Note 1999
REPLACE TYPE I WITH TYPE II Below
With A/C 1.3
Without A/C 1.1
NOTE: Use the following Technical Incident Codes as appropriate.
1-911 Core Leak
1-916 Header Tank Leak
1-910 All Other Incidents