Hello got a mk4 golf t .car takes a long time to warm up but not to full temperature ie up to the 90 mark on the guage,so the heaters are just about as hot as a an english summer (not very good) any clues much preciated
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after changing thermostat was system bled correctly. also check relay and fuses, as well as door actuator under dash that allows door to swing from heat to a.c. sometimes switch goes bad, also make sure a.c. compressor isn't continuously running, some cars do but most do not. last but not least check to see if heater core is clogged hope this helps thanx
Best case scenario is your thermostat is stuck open. When this happens the engine will take a long time to warm up and will never get up to full temp. Worst case could be a serious problem such as a blown head gasket. If there is no coolent in the engine the temp gauge will not register either.
I believe the mazda protege has a separate thermoswitch to activate the radiator's fan. Perhaps the fan keeps blowing until the temperature is too low. Try replacing the fan thermoswitch. Just take care to put in tis place a thermoswitch of the same temperature range.
Clean the MAF sensor with MAF sensor cleaner. If the hot wire inside becomes dirty, it can cause hard starting.
Check the engine coolant temperature (ECT) sensor and the intake air temperature (IAT) sensor. If either of these two sensors are disconnected, wiring to them broken, or if they failed in the full cold mode, they will send wrong information to the powertrain computer. The computer will schedule too much fuel for warm starts and the engine will flood.
The only common faulf is that the heater motor resistor has burnt out or corroded due to a water ingress . The ac take a control feed from the first position resistor when the fan position 1 is selected . Regards VW Audi Tech