please tell me which way the thermostat goes in ,is it with the spring tail to the block or the head opening side to the block .Which way does the water flow out of the block or into the block at the thermostat? .I have a
187 and a 192 degree thermostat and had so much bothers with the bolts seizing up I forgot which way it was originally .TOLD YOU IT WAS A STUPID QUESTION and I do feel stupid .
Not as stupid as putting it in the wrong way. Think of it this way: The thermostat tries to keep the engine temperature constant. So the sensing part of the thermostat has to be toward the engine. Coolant then has to flow out of the engine there, or the cool coolant passing over the thermostat will cause it to close immediately. The temperature sensing side of the thermostat is the one with the wax pellet and spring. Also, your thermostat may have a small hole with a "jiggle pin"
- turn the thermostat so that's at the high point, this is to help burp the air out of the system.
Just found the answer in the IPD catalogue and yes got it round the wrong way didn't I ?So much for the grey hair ,what a smuck ?
i just guessed (instead of stopping and "asking") one day and almost "toasted" my motor....so, its not such a stupid question......
BTW the thermostat that was in the car originally was too hot 92 deg where as the correct one for the 1990 740 turbo is 87 Deg .I wonder how much difference the 92 deg vs the 87 deg affects the sensors and other critical settings .
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