What coolent Set at 65'o output is 86'o?... set at 65'0 output is 87'0

upgrade your device

Your year--make--model didn't post for some reason? Can you give that info, plus, what does the relay control?
Usually terminals 30 and 87 are on the load/switch side of relay. Terminals 85 and 86 are on the control/coil side of relay.

Yes, they appear identical engines. The engine wiring for the two years appears identical, down to the same knock sensor. So it is likely in the same position as on your '87. Only difference in the two years, is your 1987 might have an extra emissions solenoid or two, but the engine controls and sensors all appear identical.

on a replay there are 2 particular connections that cause that. When you look for numbers on that relay you will find the numbers 30, 85, 86, 87 and 87a. The problem is their is power going to 85 or 86 (they are the 2 control terminals that control the relay). that should not be. basically 87a allows power to go through the relay when the system is shut OFF, Terminal 87 is the path of power that turns on whatever is connected to it. Now... 85 and 86... one of them is ground... the other power. Typically 85 is ground and 86 power. Now to better explain what is going wrong. you have a connection that feeds power to 87a. that power is powering 87 which powers 86. when power is turned on at 87... it turns on 86... that causes the relay to pick up an break the connection of power to 87a while at a fraction of a second later making the contact to 87. So... the path of power is turning the relay on and off all by itself, LOL. I know this is confusing, sorry. But I hope it helps

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NOISY VALVES IS A PROBLEM WITH THE ADJUSTING AND WEAR OF THE SYSTEM.YOU WILL NEED TO GO TO SHOP.

MEASURE THE IDLER PULLEY....SOME WILL HAVE DIFFERENT SIZED PULLEYS.MEASURE IT FROM END TO END...IF IT IS 3 in.PULLEY USE 86 3/8 IF IT IS 3.5 in.PULLEY USE 87 1/4..
ONLY WITH THE 3.7 LITER ENGINE.

the "30" is your "+" power terminal
the "85* is your "-" ground terminal
"86" and "87" are the rest of your wire connections.
Good enough, please rate the advise. Thanks

change your thermostat, its stuck open. I had the same problem and now I have heat!