SS2Z06

I recently replaced the h/e pump with a johnson and all was ok. I now installed the code 3 heat exchanger and went to blead the system and now coolant was being circulated by the pump. the pump isn't coming on. the connections seem good but when testing for power(even before my connection there is none). I am at a loss and about to lose it after all the bs that went into this. Any help would be greatly appreciated. Ive checked what I believe to be the fuse for the pump was. The bumper is still off if that makes a difference.

2003 S600

check the fuse, on mine it is in a little box on passenger side not in ecu box, closer to front by the right abc strut top 10A fuse. Or relay bad.

aluthman

I am having the same problem with my SL55. Where is the relay for the pump and does anyone know the part number for it in case I need a new one?

Exotic-metal55

If you have power to the pump,, then pump is bad.. I put two Johnson`s on my car and they both burned up in a few hundred miles.. Never went back and never will.. One of mine when out on a dyno test and coolant became so hot that it blew a heater hoses off! That was a mess!