I am not familiar with the exact unit on a D4, but most electric heaters have either a circuit breaker or a limit switch that will shut it down to prevent over heating and/ or fire. You will need to see if it is pulling more than rated amps. If not, you probably have a weak circuit breaker or a defective limit switch.
SOURCE: Engine overheats but is not leaking from radiator
check ur themostat take it out boil some water in a pot drop ur thermostat in the pot watch to see if it opens take it out watch it close if working properly,make sure ur pump is moving water take off ur radiator cap to insure water is moving,then check to insure ur cap is getting a good tight seal u only have ur cap,pump,hoses,radiator,thermostat,unless of course youve overheated recently???then u could have other issues
SOURCE: MAY NEW ALTERNATOR PUTS OUT 14 VOLTS WHEN I START THE DIESEL 5.9
the voltage regulator is in the computer,check you battery with volt meter with engine off it should say 12volts then check it again with engine running and it should say 14-15 volts. if not the you will have to take it to a dealer to check the computer,hope this will help you!!!
SOURCE: Peugeot207 1600 Diesel HDI goes into limp mode
This make is not sold in the USA so have little or no info on it. Sorry
you have air trapped in heater core or the core is plugged,have system flushed
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