Engine Size: 4.0
Refrigerant Type: 134a
Country of Origin: United States
Hello! I have a 1994 Ford Aerostar that has a leak on the line set that goes to the compressor. After having the system evacuated I was able to take the line set off and see what is going on. The fitting on the right side of the block is okay, and from what searching I have done that is the over pressure release, i.e. if the system were to get to 450+ PSI that would let go. That one is not leaking. The one that IS leaking is the brass fitting with the little yellow X on the top. It will hold a vacuum all day long, but as soon as the smallest amount of pressure is introduced it will hiss. If I push my thumb on the top it stops, but as soon as I let go it starts hissing again. What is this thing?
By surprise, this is a Low pressure relief valve. Why Ford did this is a surprise to me. The part is available by Ford Only, Part# F4TZ-19D644B sells for about $30.00 special order.
Thank you! That is very interesting indeed why Ford would put a low pressure relief valve. Oh well - now that I know what it is I can replace it Thanks again!
If it's leaking around the base, you may just need to unscrew it and fit a new o-ring. Leaking out the hole in the side you would need a new one, or some way to stop it up permanently.
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