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Posted by 3134, Aug 3, 2006
Newbie Forum - Beginner/newbie/general DSM modification questions. First mods, how to run 10's when you haven't run 12's yet, any tech question that doesn't fit in another tech forum.
Have you tried swapping out the coolant temp sensor to solve your temp gauge problem?
Have you ran the car and visually checked for leaks?
You could get the stock one working again, but preferabaly you might as well just gone and get an aftermarket coolant gauge thats more percise, or get the palm pilot logger that will log your coolant temps...( Good idea for a logger anyways)
Now as far as it leaking, on my old engine my water pump seal was bad, and it leaked out a lot of water while i was driving but only while i was driving because the water pressure rises when you drive to make it come out... ( but when its off and sitting still its not leaking therefore would give you the impression it doesnt leak ) Look around the water pump area for signs of any dryed substance or caulking around that area... *( and what type of coolant do you use? ) And also do a compression check because its possibe your head is messed up allowing coolant to enter the combustion chamber and go out with exhaust but im sure youd know if it was that because it would perform really poorly.
Also you could try revving it to see if coolant sprays out from somewhere.
Basically the two tests that should be done are as mentioned earler. The coolant pressure test will tell if you have a leak in a line somewhere. And the compression test will give you more insight as to if it is the head gasket.
Either the coolant is hitting the ground (either up front or out the exhaust), it's burning up (smoke out the exhaust), or it's joining up with the oil.
Your car will suck coolant back into the system when it cools down. Water takes up more volume when it heats up which is precisely why your overflow bottle is there in the first place. The system should squirt some in there when it gets too hot, and suck it back in when it cools back down. However, it seems as though your radiator cap is either too worn out or does not hold the proper amount of pressure, as being at idle should not create enough heat to push coolant out of the system. Just drop by Pep Boys or something and grab a 13lb radiator cap. If your radiator cap is not functioning it will let coolant be pushed out under the correct pressure, therefore filling your overflow bottle too quickly and dumping it out under your car... obviously not having enough left over to be sucked back into the system.
The last thing that you want is for it to dump all of your coolant while you are on the highway.