Q: What can I use to seal a crack on the plastic housing to my thermostat

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I just need to seal a crack and i need to know the best product to use

Most thermostat housings that are made of an injection molded plastic are not repairable and will need to be replaced. There is some plastic repair glues out there but do not work very good on these housings.

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What others are asking

Q: The thermostat has been replaced in my car twice in six months because the Service Engine Light keeps coming on

The thermostats on this engine have an electrical heater element intended to help the engine warm up faster. Many thermostat housings for this engine are plastic - from different suppliers. The plastic housings tend to leak around the heater wire...

Q: I need to have a bad thermostat replaced.

Thermostats should not cause fluid to leak but will cause it to overheat. You should have your cooling system pressure tested to determine where the leak is coming from.

Q: I have a Lincoln LS 2003 3.9, changed the thermostat and O-ring, bled the system until steady flow came out. Now it's leaking from

If the thermostat housing is leaking after you replaced the thermostat then you either did not seat the thermostat correctly or the housing is cracked. Remove the housing to check for cracks.

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