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the sending unit will not affect heat but if its broken it will effect the fuel control by giving computer false info, i dont think theres a problem with the temp unit, i think the thermostant is bad and is stuck open or you are very low on coolant, if the thermostat was stuck open then you would get some heat not very hot and would take a long time to get heat. i would start by replacing the thermostat, it is very important to bleed air from system after coolant change or thermostat replacing, after filling run engine until fan turns on , let cool some to release preasure then remove cap start engine and top off, drive for 15min then park let cool and recheck coolant, hope this helps,
You have air in the system.Make sure the over flow bottle is to the full hot level and start and run the vehicle.Do not let it overheat.Shut it off and let it cool down.The coolant from the over flow bottle should go into the engine.This could taker a while.Refill the coolant bottle to full hot level and repeat til air starts coming out warm.Make sure you put the the heater to the floor heat.Good luck.
Humm I make the assumption that you don't have overheating problems. Yes, sounds like a thermostat is stuck open. If you have a gage on the dash you may also notice that the engine temp takes a long time also. Sometimes when you sit a light for a while the temp edges up and starts to get warm....then when moving down the road a higher speeds the temp cools off again. this does this because the thermostat may be stuck open and it cools the heated water in the engine when moving. Also, check the coolant level in the radiator. (only do this when cold!!!!!!!!) ok????? NOT HOT! low coolant can affect how the heater performs. (low volume)