Just starting today, I had my engine overhear and had prestone coming out of the overflow bottle. I did notice that at times the cooling fans would not come on, but a few times it did come on. At times it seemed it should have shut off, but kept running. i was going to change my thermostat because I haven't had any heat most times for about a month. At other times it does seem warm, but not hot. I was going to install a 180 thermostat. I was also wondering if my main issue might not be the engine coolant temp sensor, since at times the fan does start up like it should. Is this located right next to the thermostat housing, or down under the throttle body? Is there two sensors that could be causing this issue or just one. I did notice also that my heater core had a slight leak coming inside, so I wasn't sure if this could be part of my no heat issue. I did notice the coolant has lots of crap in it, and I did flush it once using the prestone flush. Seems my coolant lines are circulating though, when i felt them. Is the thermostat sticking or what? Should I just start with changing these two items? I drove it home tonight and the fan was working fine and kept it under half way on the gauge. Any advice would be appreciated. Here is what they sold me today.
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