My 96 tbird is over heating, and coolant is leaking inside on the passenger side floor. i replced the fan motor, the intake manifold is new, the water pump is 1.5 years old. all the steam from overheating comes through the defrost port inside the car. any ideas?
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Re: 96 thunder bird overheating
Sounds like the heater core (a small radiator of sorts under the dash)
is leaking or a hose going to it is leaking. If in a warm
climate, you could bypass or block the heater hoses temporarily. Their
only purpose is to make heat avail to interior of car. The 2 heater
hoses either connect to feedthru's at the firewall or simply pass thru
the firewall to the heater core. Every car I've seen has it on
Peer up under the dash, it should be clear where it's coming from.
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Was the coolant old and weak? At ten degrees, a weak coolant could result in freezing and that can cause an engine freeze plug to burst open. Check the side of the engine block for signs of leakage around the freeze plugs. Another possibility is the heater hoses. They run along the passenger side of the engine as well. The last possibility is the heater core. If it leaks you may smell coolant inside the passenger compartment. You MAY get a wet floorboard on the passenger side. Coolant leaking from the core usually will fall into the condensation pan for the A/C and run out of the passenger compartment thru the firewall on the passengers side.
Damp passenger floor sounds like a heater core. What a pain in the a__. Most probably the dash has to come out to replace. That is the only thing I know of that circulates engine coolant into the passenger compartment. If you confirm this and want to fix it on the cheap, you can put a crossover hose in the engine compartment and bypass the heater core entirely. This is a $5 fix that works perfectly, mechanically speaking. Unfortunately, you will have no heat. Of course, you may decide that is a better option once you hear a quote on getting the heater core replaced. Oh yeah, get a new mechanic.
A thermostat that does not open and close would cause these very symptoms. Since it does not allow coolant to flow through the system, it will make the engine overheat. Since it won't allow the "heated" coolant to pass by your fan, the heat will continually blow cold air.
Stop driving the car immediately, becuase the next step will be some blown gaskets - especially head gasket. Other possible reasons can be as follows:-- It could be just low on coolant.
if it is then add coolant...
with low coolant the water pump can not move enough coolant to supply hot coolant to the heating system . also if its low the motor will over heat fast..... If the system is full then you may have other problems.. such as
1) bad thermostat
2) bad radiator cap ( not holding pressure so it will leak coolant)
3) blown head gasket .
4) bad heater core (leaking coolant out.. check the floor board under the dash on the passenger side.)
5) bad hose or clamp. Thanks. Keep updated for any more query. You can rate this solution and show your appreciation.
if your heater core is bad you will more than likely have coolant on the carpet on the passenger side floor. also this car uses a shared fan. the fan not only cools the radiator but also makes sure the a/c is blowing cold. the fan motor may be bad which is why you overheated. a sign the fan morot isnt working is the a/c stops blowing cold air when the car is stopped at a red light, drive thru, ect. since the car overheated you may want to double check that you havent cracked the plastic tanks on the side of the radiator. has the low coolant light come on?
Sounds like the heater core is leaking. Fill up the coolant and look under the carpet on the passenger side and see if there is not coolant there. IF it is a really minor leak you may be able to use a radiator fix, but do not buy something cheap and follow the directions. If one application does not seal it up, replace the heater core. It is not worth overheating the motor to try more of the sealer; it can clog the coolant passageways in the motor.
Heater control valve malfunction will not cause engine to overheat unless coolant is leaking externally...Overheating going down the road can be the result of a few different things...Partly clogged radiator...Insufficient air flow due to possible fan problem...External coolant leak...Make sure fans are operting properly and have cooling system pressure tested for leaks...Gaining and losing heat on the inside of the vehicle usually means system is low on coolant but you must find out where coolant is going
I'm not familiar with your model to know if you have an engine temp guage or a light that would come on if the engine is overheated. You said the motor wasn't overheating under the hood... but you have an overheating problem? Maybe just a tad bit more info...
Are you losing coolant?
The water pump if bad, would probably leak or make terrible racket.
Just to take a shot at it, since you said it blows smoke through the dash... I'm assuming a kindof white smoke with a rather sweet smell? Have you noticed any wetness on the passenger floor at all? If yes to any of this, I would suspect as you mentioned, a leaking heater core. Hope this helps... Good luck!
If it's your heater core, unless you're a mechanic you probably should get professional help. The heater core is located on the firewall and many parts need to be replaced to get to it. Do you see water on the floor inside the vehicle, Many times a heater core will leak inside.