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Discussion Starter · #1 ·
I am having a problem with my 2005 Nissan Xterra SE. Whenever I get to highway speeds or driving uphill my temp gauge shoots up. If I take my foot off the gas it'll slowly lower. Also, my heat blows cold air no matter how long I've been driving.

I checked my reservoir tank and my levels were pretty low so I added more antifreeze but it didn't even temporarily fix the problem...

A couple of months ago I got my radiator and transmission replaced because of coolant leaking into my transmission.

My questions are:

What could be the cause of this?
Are there ways I can check myself for issues? (For a novice)
And what issue y'all think it is, is it something that can be fixed DIY or does it need to be taken in?
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