There is no direct answer to this question. If you're sure that the relay is overheating, it,s a sign that it's defective. Or a short caused by a possible bad ground or any related electrical part causing a short. A true diagnostics on this related part requires more information. Check the wiring for poor connections. Start with the wiring at the relay first.Fords are notorious for poor connections. Bad grounds causes shorts because of reverse polarity. Which in turn causes electrical parts to get to hot.
There was a Ford Motor Company recall on certain Aerostar Vans concerning this situation. You should do a search for 'Ford Aerostar recalls' then type in your year and it will give you the info. It seems like it was a dealer fix requiring installation of a grounding strip in the electrical circuit. .
The function of the fan is to help prevent overheating.
Yes a bad thermostat would cause overheating in any car. A thermostat regulates the temperature.
the radiotor or the cams
Yes it could.
yes and ignition relay would..
Overheating causes pigs to over heat.
If air is trapped in the cooling system and is not removed, yes, it will cause overheating.
Yes it can. A faulty thermostat can cause overheating which will cause coolant to be pushed out of the system.
Sounds like you need a tune up By itself low coolant would only cause overheating, if it is overheating that can cause runnimg complaints.
Any relay could be the cause.
This is not the cause, this relay is to start the and run the compressor (Basically) and it will not cause the system to lower overnight.