I recently replaced the thermostat in my 94 Maxima and it takes about 20 minutes for the heat to work at all and only after the temp. gauge pegs out on ''H'' for a few seconds then returns to the normal range does the heat start working. What is happening here?
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Has your engine thermostat been replaced recently? When they get old, the usually get stuck iin the open position. This causes the engine to take a considerable amount of time to get to operating temperature, causing you to be without heat inside the car.
In my 94 maxima this problem was solved by replacing a relay - but my gauges didn't work either.
You probably have a loose connection - jiggle the wires, unplug then plug in wiring harness. Start underneath the dash because it is the easiest, then you may have to remove the instrument cluster (this sounds tough but should only take 10 minutes - just need to remove some screws).
There are several reasons for no heat. 1st, how is the temp gauge in the car? Is it in the normal range, or is it running cold or hot after warming up? How long does it take to warm up? 1st check the coolant level, make sure it is at the correct level, bleed system to remove any air (bleeder bolt usually located near the thermostat housing.) If that checks out ok, and the engine is not warming up, change the thermostat. If you still have a problem, the heater core may be plugged up with rust and sediment. Flushing the system may help to restore the flow of coolant to get the heat going again. Worst case scenario, system plugged beyond flushing out the crud, heater core would have to be replaced. Start with the easy stuff 1st, hopefully that will work. Good luck
This sounds like the thermostat needs replacing as long as the radiator has the proper coolant level. If your vehicle has a temperature guage watch it to see if it is at normal operating temperature after the warm up period. If the temperature goes up and down or doesn't reach what is the normal temperature that is the problem. Normally a bad thermostat will stay open which causes the engine temperature to be much cooler than normal thus no heat.
You need to replace the thermostat in the radiator, they are very inexpensive and most times you can replace it yourself, if that doesn't help, drain the radiator and buy a drain kit and radiator cleaner, it will remove rust corrosions and anything else blocking up the flow, replace fluids and check to see if it runs properly, worst case senario is that your water pump needs to be replace cause Nissans are notorious or I should say Older models are and water pump seems to be the thing that goes out before anything else