No heat

[Sean 0]

All of a sudden my taurus has no heat and the winter is here. I've been through everything. Is it possible for a water pump to be bad and the vehicle now overheat? 

[TaurusKev 1088]

If your car is overheating and have no heat, it could be a few things. Water pump is a good candidate. However, check your coolant level, is your coolant level full. If the car is overheating, it could be bad thermostat, low coolant, bad water pump, or something is plugged up inside the engine. 

 

[Sean 0]

Sorry. I meant the car not overheat. The car never overheats and I've checked all hoses for obstructions. Thermostat is good, fluid level is good. I flushed heater core twice, and I even put a new one in afterward just to be sure. The bypass hose seems to always be hot but heatr core never sees much coolant. Could the water pump be just good enough so that the car never overheats but not strong to get through the heater core. Has anyone seen this. It seems like the waterpump is the only thing left. Also, the actuator vents are fine. The heater core just doesn't get hot.

[TaurusKev 1088]

I personally have not, I would say it is plausible. I would assume you've flushed the whole coolant system out too?

[Sean 0]

I was very fortunate to have the 2 days where it stayed above zero Celsius, so I put in prestone rad flush and flushed it out 4 times with water over a couple days of running the car. It never overheated once. There was a lot of crap in the system initially but its very clean now. It is a very weird problem. 

[Sean 0]

All of a sudden my taurus has no heat and the winter is here. I've been through everything. Is it possible for a water pump to be bad and the vehicle never overheats?

[Sean 0]

The car never overheats and I've checked all hoses for obstructions. Thermostat is good, fluid level is good. I flushed heater core twice, and I even put a new one in afterward just to be sure. The bypass hose seems to always be hot but heatr core never sees much coolant. Could the water pump be just good enough so that the car never overheats but not strong to get through the heater core. Has anyone seen this. It seems like the waterpump is the only thing left. Also, the actuator vents are fine. I flushed the system 4 times over 2 days with rad flush and water. There was some crap at first but its clean now. The heater core just doesn't get hot. 

[Sean 0]

I'm gonna change it anyway I guess and I'll share my results when I'm done.

[TaurusKev 1088]

I can't think of any reason not to, but seems like you checked all your other stuff. The only thing I would have done is watched to see how freely fluid entered/exited the heater core lines. But I am betting it's a bit cold to take lines off and take a garden hose to the system. Make sure fluid freely goes through radiator, engine, lines, etc. 

[-chart- 285]

Check blend door motor.

-chart-

[Sean 0]

I'm gonna try one last thing tonight. Maybe there is an air lock. So the coolant goes through the bypass but wont go down the heater core line because of resistance from the air lock. Sounds logical, so I'm gonna disconnect both hoses from the heater core, pour coolant in one end until it fills heater core and comes out the other end of the hose. Was talking to someone this morning and its something I never considered.

[TaurusKev 1088]

Yeah, Chart brought up a good one, I know you mentioned vents work, but the blend door actuator could be a problem too. My 02 Sable had that go bad. Very easy fix generally. You could take the radio/climate control knobs out to see if you see it actuating when you change temperatures.