The MGF and MG TF radiator is a crossflow unit with a copper and brass core and moulded plastic end tanks, mounted at the nose of the car behind the front bumper. Two distinct radiator assemblies are catalogued, one specific to the MGF and a separate one specific to the MG TF, reflecting the different mounting arrangements, hose connections, and bumper packaging of the two models. The radiators are not interchangeable between MGF and MG TF. The MGF radiator is supplied with the bleed screw as an integrated part; on MG TF radiators and as a replacement item, the bleed screw is a separate catalogue line.
The bleed screw is a critical service item during coolant refills, the MGF and TF cooling system has multiple high points along its long circuit, and proper bleeding is essential to eliminate airlocks that would otherwise cause localised overheating.
Radiator Mounting and Brackets
The radiator locates in the front body member at its lower edge via four rubber mountings and is secured at its upper edge by two mounting brackets bolted to the bonnet locking platform. The four rubber mountings isolate the radiator from body vibration and allow slight movement during thermal expansion without stressing the hose connections. On high-mileage cars, the rubber mountings can compress permanently or perish, and replacement is a sensible preventive service during any major cooling overhaul. The two upper mounting brackets are available in standard steel and in a stainless steel pair as a direct upgrade, the original steel brackets can corrode in the exposed position at the nose of the car, and the stainless alternative is a fit-once solution that takes no additional labour at fitting.
Rubbing strips at the upper and lower edges of the radiator protect the hoses against chafing where they pass over body panels, and packing foam at the top and bottom of the radiator seals air gaps around the radiator to ensure all the airflow entering the grille passes through the radiator core rather than bypassing it.
Top and Bottom Radiator Hoses
The radiator connects to the cooling system by a top hose and a bottom hose at the front of the car, which carry coolant between the radiator and the underfloor pipe connections. These hoses run at lower coolant temperatures than the engine-bay hoses but are still subject to age-related deterioration, rubber hardens, cracks, and loses flexibility, and clamping forces at the hose clips can ease off over time. A burst radiator hose causes rapid coolant loss, but because the radiator is at the front of the car and the engine is at the rear, the initial coolant spray is often not visible from the driver's position, the first symptom may be a rising temperature gauge. Quality replacement hoses in the correct lengths, bends, and connection diameters are supplied by established marque specialists (Graydon is a common original-equipment supplier); fitting generic hoses cut to length is a short-term fix that risks failure at the bends.
Underfloor Coolant Pipes, Standard and Stainless
The underfloor coolant pipes are the physical link between the front radiator and the rear engine, running the length of the car beneath the cabin floor. These pipes are the single most significant service item in the MGF/TF cooling system, because corrosion of mild steel pipes exposed to road spray and salt is one of the characteristic long-term failure modes of these cars. Pipe corrosion is progressive and often invisible from above, the pipes degrade from the outside and frequently develop pinhole leaks that evaporate coolant against the hot pipe or road surface before a visible drip forms. By the time coolant level drops enough to register on the warning system or the temperature gauge, the system may already be partially airlocked.
Standard mild steel replacement underfloor pipe assemblies are available in two specifications: one for manual cars and a different one for Stepspeed CVT automatic cars, reflecting the different routing required around the gearbox. Stainless steel underfloor pipe assemblies are available in both manual and automatic variants as a permanent upgrade. Because the pipes are fundamentally a one-time replacement once the original steel items begin to fail, the incremental cost of stainless over mild steel is recovered the first time a pinhole leak doesn't develop, and the stainless pipes should outlast the rest of the car. Fitting stainless pipes at the same time as other major cooling work, head gasket replacement, PRT retrofit, or a major cooling overhaul, is the most efficient use of labour, as the underfloor access is already required for any of those jobs.
Engine-End Hose Connections
At the engine-bay end, the underfloor pipes connect to the engine cooling circuit via a series of short hoses.