Needle In A Hay Stack - 7.4L L29 Heater Bypass Hose

[andy396]

it's been a while since I had my 97, but don't remember seeing that line. It was a ECLB. Had to replace the intake gaskets, and don't remember disconnecting that line.

My working assumption up until this thread was that it was a Crew Cab and Suburban thing. So it fits that your extended cab didn’t have it. JSlezac83’s Crew Cab seems to be the exception.

 

[b454rat]

yeah must be. Not too many crews or burbs with 454s around here...I'll look tho...

 

[JSlezak83]

There’s no evidence that the solenoid or valve were ever there, but I don’t know the history of my truck.

It was involved in some kind of front end damage. The insides of the fenders are white, and the front lighting harness was definitely replaced.

The truck was optioned with the compass/temp mirror, but there is no temp sensor. The cavities in the harness connector are vacant, but do not have the rubber plugs in them.

I can’t for the life of me imagine why someone would have taken the effort to remove the pins from the harness, but that’s the case. Maybe said individual also removed the solenoid and clipped the harness near where it enters the firewall. It’s not the easiest area to investigate.

Either way, I think I’m going to go scavenge the parts to add the solenoid and bypass valve.

 

[andy396]

Either way, I think I’m going to go scavenge the parts to add the solenoid and bypass valve.

The key components are still available:

Dorman 600-104 Actuator https://www.amazon.com/dp/B003YP4KE0/ref=cm_sw_r_cp_api_i_lzzzDbXZHM7ZT

ACDelco 15-5533 GM Original Equipment Heater Water Shut-Off Valve https://www.amazon.com/dp/B000C9DDIA/ref=cm_sw_r_cp_api_i_dPzzDbBP8EVZF

 

[1998crewcab]

1998 gmc c3500 crew cab long bed with 7.4 federal truck
Nothing like it on my vehicle


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