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. .
Yes a bad thermostat would cause overheating in any car. A thermostat regulates the temperature.
the radiotor or the cams
Yes it could.
Overheating.
Overheating causes pigs to over heat.
If air is trapped in the cooling system and is not removed, yes, it will cause overheating.
yes and ignition relay would..
If the Aerostar is not set for auto lock when the vehicle is put into gear, check the door lock, switch. Also check the lock relay and wiring for a possible short.
My guess would be dehydration and/or 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.
The most likely cause of a 1992 Ford Aerostar stalling while idling is bad spark plugs. The plugs should be changed and the timing checked to resolve the problem.