psovillis

I have a 94 t-bird lx, the temp gauge keeps going up and down and the cooling fan keeps going on and off, What can cause this.

aasltmike

I have a 93 LX that the temp gauge did the same thing. My problem came down to the thermostat slipped out of position in that funky neck that connects the upper radiator hose to the block. The way that thing was designed makes no sense as there is no matching key mark in the neck to keep the thermostat in place when you're re-attaching it to the block. I got around this by using some high temperature sensor safe RTV to glue the thermostat into the neck and vise grips to hold it in place until the RTV cured enough to hold the thermostat in place while I was re-attaching the neck to the block. Not sure if this will help, but that's how I solved my problem like that.

psovillis

Thanks, I will check that out.

fold_em83

If its the 3.8, its most likely a blown head gasket. Check for coolant in the oil.

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94 Thunderbird LX

72tbird

If it is not the thermostat it could be the water pump. Did you have that checked?

Also drain and flush the system, have it pressure checked as well to be sure there is no leakage, this will tell you if fold_em83 is right about the head gasket. This will also assure the coolant to water mixture is correct.

Hope this helps,
Mark