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Hi everyone!
I have a 2010 SX4 crossover auto with 144k miles I just replaced my water pump, radiator, reservoir, temp sensor with all the gasket. I changed all those because the water pump is leaking so might as well change all of them since it's high mileage.
After I changed all those parts now my car temp gauge always went up to high when i m driving in highway with heater on or off. But when I drive stop and go traffic in the city the temp gauge go back to middle. Does anyone knows what's wrong with my car? I check nothing leaks, radiator fan turn work just fine and the coolant level is normal. Please help thanks!!
 

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Does your heater work flawlessly...giving regular heat when you ask for it. WHile your profile/signature is inexistant, it seems you are from the USA, hence engine is J20B. Fill up your signature/profile with all details about car and location. Specially trim.... auto or manual HVAC ?
 

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Does your heater work flawlessly...giving regular heat when you ask for it. WHile your profile/signature is inexistant, it seems you are from the USA, hence engine is J20B. Fill up your signature/profile with all details about car and location. Specially trim.... auto or manual HVAC ?
Hi,
Before I change the water pump, radiator the heater doesn't work. Now the heater work perfectly. Yes, I m located on USA Northeast so outside temp currently around 5-6 Celcius. My HVAC is manual NOT automatic. I drove to work today and if I drive above 50 mph the temp gauge went above normal. Once I drive in a stop and go traffic it goes back to normal level in the middle. Thanks for your fast reply.
 

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have you changed the thermostat and if so, is it a good quality 82C one? with bleed hole to the top?
 

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I don't know, I use the OEM ones as I find most of the aftermarket ones are not that well calibrated and can stick.
 
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