Flushed coolant 5 months ago. Ever since Fall arrived, and I needed to heat the inside of the car, the heat has been coming and going. So I changed the thermostat last weekend. Still didn't work. Ran water through the heater core to see if that was plugged. Water went through just fine...and the water was clear, not dirty at all. Engine warms up in normal time. Any suggestions?
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Re: Heat comes and goes
This is a common problem with the Taurus. You have an air lock in the system. You need drain the rad and open the cooling system at the highest point. This is usually the upper hose on the heater core.Fill the rad very slowly until the coolant comes out of the upper hose connection. Once done run the car with the hose reconnected and the rad cap off.Put a container under the rad filler.Run the car until it comes up to temp.Slowing top off the rad with the car still running. This should do it.
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CarGurusAug 20, 2014 - Also as my temperature gage rises but car does not overheat. ... tempneedle gets up towards the red mark while you're driving, then yes, ... i have a 2006Pontiac Grand prix and my temp. goes up to the ... crzgrl637 answered 6 months ago ...the cooling fans won't kick on then you will see gauge over heat.
Try back flushing the heater core or take it to a local repair shop. Look for two black hoses coming out of the firewall, usually on the passenger side and close together, disconnect those use a garden hose and spray inside each of the heater core ports till clear water comes out bout sides. As always double check the coolant level.
If the heater core is not damaged or leaking ie: if you don't see coolant on the INSIDE of your windshield or coolant on the floor inside the car then chances are you may just need to BLEED the radiator.
remove radiator cap
Fill coolant resovoir to the cold line if the engine is cold from sitting overnight.
Start engine with cap off
Wait till engine gets hot
While waiting you will see a big gurgle of air bubbles come out and the coolant level will drop
Fill the radiator with more coolant to compensate.
When the fans come on and it stops gurgling air install the radiator cap
You are done
Watch the coolant level for the next few days and top off in the resovoir as needed to keep it filled.
Your heat should be very hot now providing you installed the correct oem thermostat correctly.
check coolant level
is the heat gauge LOWER then normal if so
replace the thermostat
if the engine temp. is normal then feel the heater hoses both should be HOT not WARM
if they are not HOT then you have a flow problem poss pluged heater core you may need the heater core back flushed
hope this helps
If you did not have this problem before the coolant was flushed and replaced, then you most likely have a air pocket in the coolant system causing the over heat or running hot condition. Nissan's can get air pockets very easy if not bleed correctly causing over heating.