Disconnecting hoses and fittings on the radiator
Check the hose and clamp before removing the heat sink. If the hose breaks or deteriorates, or if the clip is corroded, purchase a replacement. Always use a screw clamp to replace the clamp.
Make a note of the configuration of all heat sink connections, if necessary.
In addition to the top and bottom hoses, there may be pipes connected to the expansion tank, electrical to the thermometer or automatic fan switch, which must be disconnected.
The fan can be bolted to the heat sink. Depending on the design, you can remove it to release the heat sink or remove it with the heat sink. Please check the car repair manual.
With electric and mechanical fans, you may need to remove the fan cover to release the heat sink.
Some cars have a splash guard under the radiator and must be removed. A car with an automatic transmission can be provided with a transmission oil cooler at the bottom of a conventional radiator and has a threaded joint for the oil pipe.
Disconnect the battery before beginning to disassemble any heat sink with electrical connections. Then remove the pressure cap and drain the radiator.
Loosen hose clips and ease off the hoses by twisting them gently to and fro.
Do not try to lever off a hose with a screwdriver: you may damage both the hose and the radiator stub - particularly if the stub is plastic.
If the hose snaps quickly, use a sharp knife to cut and replace the hose at the end of the short tube. Cancel any electrical connections and check that they are clean and in good condition.
Before unscrewing any tubing fittings (for automatic transmission radiators), there is a container ready to receive oil. Do not use the oil again - then fill the gearbox with fresh oil.
The seal is disconnected from the heat sink and the fitting on the pipe, and a polyethylene bag and rubber band are used to prevent dust from entering.
When you refit the oil unions take great care not to get the nuts cross-threaded, and tighten them well to prevent leaks.
Unscrew the radiator mounting bolts and ease the radiator out, removing such parts as may be necessary to clear the way.
Remember the order in which you removed them, so that you can reverse the sequence when refitting Take care not to crush the soft metal radiator fins or otherwise damage them or the fan blades.
When reinstalling the hose, tighten the clip securely, but do not overtighten it as this may cause the clip to cut the hose or crush the plastic tubing that is sometimes installed.
Sliding out a radiator
Some cars have unusual radiator mountings: look carefully all over the radiator and find where the mounting points are - they are not always obvious.
Draining the radiator
With the engine cold, take off or release the pressure cap on the radiator - or on a separate tank if one is fitted.
Some cars have a tap or drain plug in the bottom of the radiator - open it and the radiator should empty.
If no water flows, poke a drain-plug hole gently with wire, or unscrew and remove a tap. If there is no tap or plug, or if you are unable to clear a blockage with wire, disconnect the bottom hose at the radiator end.
Store the coolant with antifreeze before reuse. Drain it and put it in a clean container, then remove it through a fine cotton cloth to remove rust or dirt, then put it back.
Then, please check the strength of the garage check solution. Or, if you have an antifreeze hydrometer, you can check it yourself.
There may be a drain tap or plug at the bottom of the radiator.
If there is no drain plug or faucet, disconnect the bottom hose.