I changed my thermostat gasket three times now and its still leaking at the bottom and not on the top I ?

tighten the bolts down real good. I dont know what could be the problem. I have a 1989 ford thunderbird lx 3.8
I changed my thermostat gasket three times now and its still leaking at the bottom and not on the top I ?
maybe a crack inthe housing...or misaligned thermo stat?? is it top mounted or on its side?

try using some sylastic goo
I changed my thermostat gasket three times now and its still leaking at the bottom and not on the top I ?
Are you sure the thermostat is in correctly? Did you clean the old gasket off completely? If you leave some of the old gasket without realizing it, that can cause a leak.

I believe the housing part that comes off has a lip for the thermostat to seat into and if it is not seated, that will cause a leak also. Use some RTV or anything sticky to help hold it in place until you get the housing seated.

If the housing has scratches or pits that are very bad, that will also cause a leak. Again, use some RTV to help seal the gasket. That will fill the voids that the gasket is not sealing. Also check to see that you didn't crack the housing possibly by not getting the thermostat seated the first time.
Sorry to here you are still having problems with that. Go back and see if they offer a thicker gasket.Some places will sell a thick rubber gasket. Try getting a wire brush or something and sanding on the surfaces to be sealed. Are you sure something is not cracked? If all else fails use the rtv gasket maker and put it down real thick on both sides of the metal housings. Let this dry for 15 minutes or so , insert gasket between then put the neck on and tighten down. Have had to do this on many older 350 Chevy's that way. Sometimes after time the surfaces will warp and the thin gasket is just not enough.
Did you clean the old thermostat gasket material off before installing the new one? is the thermostat and gasket the correct way up, you could put a thin bead of silicone on the manifold and thermostat housing as well, and on the threads of the bolts, the thermostat housing could also be warped,
It could be the wrong thermostat or that you've not cleaned the two surfaces good enough what I try to do is use a paint scraper and fine sand paper and make sure the two surfaces are fully dry but I recommend using a high temperature gasket maker that runs about 8 bucks bec it can be used many times and helps stop or prevent any possible leaks.





Hope that helps and best of luck.
Need more information. Is it bottom of thermostat housing or bottom of the engine? If it is leaking from bottom of the housing, the housing is no good.
maybe the thermostat slid under the housing. they will do that sometimes. try putting the thermostat in the block first. or it could be your not tightening the bolts evenly. just tighten each bolt a little at a time until they both are tight.
make sure the thermostat is the right one for your car and it's possible the housing is warped, buy a new thermostat housing.
Make sure you have the right one then put some FORM-A-GASKET on it.

Can be found at any auto parts store.