Quote:
Originally Posted by david-b
Welcome to AF!
Usually when running cold, the thermostat is not opening. I would check that out first and replace. Even if it still looks ok, I'd replace it. It's cheap anyways. Next, I would drain and flush the entire cooling system. Drain out the coolant, stick a hose in the thermostat housing, run the car with it on until the draining coolant is just water, and then refill properly. Make sure the heat all the way on and on full blast while doing this.
One winter I had a busted thermostat and the car would never warm up to full operating temp. Sucked because it was a cold winter, and the heater will only blow cold air because of it.
As far as the noise... not too sure. If you're feeling it in the pedal, it sounds like suspension work. Can you hear any noise when the engine is just idling?
Lastly, what year/model do you have?
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Thanks for the reply. I do not hear any noise when the car is just idling. I only hear it when the car is working hard (ex. higher rpms, uphill driving, high speeds). It sounds almost like I'm constantly running over small bumps on the road. I don't know if it is actually located by the accelerator or not. I just know I can feel the knocking/tapping vibration on my foot when it occurs and it's usually when I break the 45 mph mark. I thought the two symptoms (engine running cold/knocking) may be related since they both occurred at the same time, but it could also be a coincidence. My car is a 1998 Mitsubishi Eclipse RS.