Quote:
Originally Posted by bigwave2255
hmmmm, hard to know what to do, i still think the gas level needs checking first, then maybe the fan.
why couldnt it be a simple 12v supplied = fan on no 12v fan off, with this pulse thing it makes it all that much harder to fault find, or am i missing something
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The pulse governs the speed of the fan. The faster the pulse the longer the fan is engaged so it will spin faster whereas the slower the pulse the shorter the fan is engaged so it will spin slower. This eliminate the use of resistor packs and everything is controlled by the DME.
If the fan is not working the computer will know that it is not working and store a code for a fan failure, but that type of failure will not trigger a CEL or SES or MIL. Get the X scan to see if there is a problem with the fan instead of throwing parts at it.