RocketMan83 Posted April 21, 2007 Report Share Posted April 21, 2007 I have a big coolant leak coming from the back of the engine (3.4). From underneath I can see most of the top half of the engine and the leak doesnt appear to becoming from the top end of the engine. The coolant is running down the alternator cooling duct, but It doesnt look like coolant is leaking onto the top of it. Also when just idleing there is no steam, when the engine is warmed up and reved it does steam. I have checked all the common places like the steel line that runs along the frame rail, heater hoses, T.B coolant lines and they all appear so be fine. Are there any hoses or any other likely causes that I may have missed? Kyle [attachment deleted by admin] Removed to free up storage space. Quote Link to comment Share on other sites More sharing options...
GP1138 Posted April 21, 2007 Report Share Posted April 21, 2007 Head or intake gaskets leaking? Compression test? Quote Link to comment Share on other sites More sharing options...
RocketMan83 Posted April 21, 2007 Author Report Share Posted April 21, 2007 Thankss for the reply. I borrowed a friends pressure tester and found that the leak is coming from around a sensor thats right above the alternator cooling duct. From what I have read this is the knock sensor? I can reach my hand up there and stop the leak with my finger. Is it possible for coolant to be leaking from around knock sensor? Quote Link to comment Share on other sites More sharing options...
5speedz34 Posted April 21, 2007 Report Share Posted April 21, 2007 Umm, I'm not totally sure on the 94+ motors, but on the 91-93 the knock sensor isn't attached to a coolant port. I'm going to assume it isn't on the 94+ either. Quote Link to comment Share on other sites More sharing options...
RocketMan83 Posted April 21, 2007 Author Report Share Posted April 21, 2007 Well I found the problem. The block heater that is right beside the K.S has a little brass plug that came loose a couple turns. I tightened it up and pressurized the system to 15lbs and no more leaks. Quote Link to comment Share on other sites More sharing options...
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