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Hopefully your mechanic would pressure test the water pump before replacing it to determine if it's really bad. Having no heat is usually a symptom of a stuck open thermostat, but if that was the case, your temp gauge would not indicate hot...maybe a clogged heater core? Did your heater core get flushed? That wouldn't explain the temp gauge reading hot, ...

You very likely have a bad thermostat. Here are some similar questions that may provide some insight: Where'd my heat go? Why would my heater sometimes blow cold air? Engine never warms up (actually: it cools down) at highway speeds In terms of your specific problem, I would check your engine temperature gauge: does the needle ever move up to its ...

Problem solved! The key was to finally locate the source of OBDII code PO 0171, left bank lean, which I realize was not part of my original question. Anyways, I found a leaky air hose connection between the manifold and the MAF, once I corrected it, the engine idle smoothed out and now we have heat as designed at idle.

It turns out the problem is pretty common with 3.5L Impalas. For some reason these engines loose coolant. Some blame is placed on headgaskets, some blame Dex-Cool. What ever the cause, refilling via the overflow jug can leave an air pocket in the cooling system. The cure is to fill via the pressure cap right to the top. Recheck the level after several ...

The location of the plug depends whether it was installed at the factory, by the dealer, or the third party. One of the most common places for the block heater plug on the third generation Ford Taurus (1996–1999) is the driver’s side opening in the lower part of the bumper (with spring-loaded cap): If it is not visible from the front (either as pictured, ...

Possible stuck thermostat. The "normal" indication on factory temperature gauges cover a huge range. My Eclipse has a factory gauge and an aftermarket gauge. The factory gauge settles in at "normal" for a 160-200 degree range (normal temp is 185). At 160 the car barely makes any heat in the cabin, at 185 it's got decent heat, and at 200 it can light your ...

Another option that you could look into is getting an engine block heater fitted. Essentially, you plug those into a wall outlet and they warm up the coolant which both helps with cold starts if you're in a cold climate, and you should get warm air out of the heater fairly quickly compared to a car without a block heater.

Your heater, like most cars, works from the heater core. It sounds like your thermostat is opening up if you can get air for a minute, but it goes back off. The thermostat may be closing again, or there me be a blockage in the heater core. If you're wanting to try replacing parts, I would start with the thermostat first. They're usually pretty cheap, and ...