I have a 99 ford Taurus single over head 3.0. Having an issue with a rough idle and no heat. Just replaced the thermostat and water pump. The old water pump was the worst I had ever seen. I have flushed the system I know 5 times. Anyone know what the rough idle or no heat could be and are the related.

eplacing head gasket, need advice - Taurus Car Club of America ...

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Apr 3, 2013 - Vehicle is a 1998 Taurus 3.0L, Gen3 Vulcan, used as a daily driver, ...target="_blank">Replacing Head Gaskets On A Ford Taurus 3.0L V6 ... With all that coolant going through the exhaust your O2 sensors are toast. .... Drives: 96 Mercury Sable LS Wagon 3.0 DOHC Duratec .... 1999 Taurus need help.

Maybe blown head gasket or glogged radiator.

Either Thermostat is sticking or water pump is going bad. Water pump usually spit out water through small hole of diaphram. Only way to check thermostat is pull it out. Then you might as well replace it.

start with the bascis, need good coolant in the system, if you have been adding a lot of water then you need to drain and fill with fresh coolant, you have allready replaced the thermostat, make sure you have no coolant leaks, would be easy to notice due to coolant on the ground or tracing, do you have good air flow throught your radiator assy, if the front grille area is clogged with dirt/bugs/debrie then it has no way to transfer heat from the coolant, need to check and clean it out, next would be to check and or repace your water pump, the fins on the back side of the pully which you cannot see untill you pull of the water pump could have rusted away which means no flow.

This is either an air lock or a leaking headgasket. Remove the rad cap, with the rad full, watch for air bubbles. You didn't tell us if you were adding coolant??

are you sure it's thermostat? dont let it overheat. could be low coolant? could be water pump, it's a common failure
thermostat is behind upper radaitor hose connection, just like the old days

Your head gasket has blown or the cylinder head has crancked.You are getting compression in the water system thats why you are getting spill out from resevoir tank.

OHV engine. I have seen these wear the blades off the waterpump. Does the heat work.

have u checked the coolant level?if its low you wont get much heat.

You may need to remove the hoses from the heater core inlet an outlet and flush it directly, I saw these get plugged up on many cars like yours while I was a Ford technician, direct flush of the core cured the issue.