1: Thermo switch for radiator: I think the thermo switch is working ok, as they rarely fall bad. But you can check it by running the engine with radiator cap removed. Use normal mercury thermometer or electronic one and put it (incase of electronic one its probe) in the mouth of the radiator. Note the reading when the fan kicks in. It should be around 90C to 95C.
2: E load idle up: There is an electric solenoid valve (2 ports connection) near the upper engine mount alongside timing belt cover. One port is connected to vacuum hub on the intake manifold and the other is connected to a diaphram on the upper right corner of the carb (near brake booster). When ever any of the following are turned on
1. head lights
2. parking lights
3. rear defogger
4. a/c , heater blower
5. radiator fan
The solenoid allows the vacuum to pass and to actuate the diaphram on carburetor which in turn slightly increases (stabilizes) the engine speed (rpm) to compensate for the electrical load on alternator.
PCV: I dont think the PCV unit in khyber is repairable. You can spray in carburetor cleaner while the engine is running (with rubber pipes removed along with air cleaner container). You should feel vacuum when you place finger on it while engine running. You may also hear a minor metallic click when you place and remove finger from over it. Other wise replace it. estimated cost of used unit is around 150 and if by chance you find a new OEM one it will be around 800.
4: Ground: Use good quality 60A load capacity copper wire. No specific brand i know of.
5. Ignition Timing: Ignition is set with the help of timing gun. 10-12 BTDC for petrol and 18-20BTDC for CNG. Timing gun is available starting from rs. 1400 in Lahore.
6: Thermostat valve: Is a mechanical valve with a mechanism which allows it to open when the coolant temp reaches a certain limit and makes way for the coolant to pass through the radiator. In closed position it forces the coolant to bypass radiator. It helps in regulating engine temperature with in optimal range and also provide essential resistance in flow which causes a pressure effect making the coolant to properly collect heat from around the combustion camber.
I will explain the installation process in detail later.