Quote:
Originally Posted by Notso
,,, but i know there is a leak, i cleaned the skidplate before i put it back on. nothing leaks when it's sitting, but when i last drove it around the block there was blue coolant (not a lot) but some sitting on the skidplate just under the thermostat housing and water pump.
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I think this is being made more complicated than it needs to be. If you know there's a leak, you already know that a pressure test is going to fail, because you have a leak. There's really no point in doing a pressure test when you can see the visual evidence of an active leak.
If you know you have a leak, the logical next step is to find the source of the leak. That involves a very special technique professionals call
noggin pokin'. The way you do this is to poke your noggin in there and see with your own eyes what's happening. You already have a general idea of where the coolant is coming from, so you already know where to start pokin' your noggin.
The water pumps on most cars have a weep hole somewhere on the bottom side to allow coolant to escape when the water pump is failing. You'll probably have to look at it from underneath to see it, but you might also be able to get a mirror or inspection camera in there instead. That's where I would start. Even if it turns out not to be coming from the weep hole, you already need to poke your noggin in there to find that leak anyway.
Fix the obvious (the leak) first and see if that stops your overheating issue. If not, move on to the next potential cause.