Engine runs cold

[OR VietVet]

I don't think so, it's the PCM that controls the fan relays up behind the main fusebox.

Is what I am thinking about something that has to be wired in when adding fans to a fan clutch truck?

 

[Fless]

Is what I am thinking about something that has to be wired in when adding fans to a fan clutch truck?

The fan harness, relays, and a connection to the PCM. Non OE conversions need to have the PCM tuned to turn the fans on. The OP's is a 2005 so it comes that way from the factory.

 

[Breadman03]

Okay, so a c-clamp adjusted (and double zip-tied in) so there is just a little flow into the reservoir had a quick warm up and kept temps between 186 and 205 on a road test. Thanks for the assist!

Now to work on the fans. Oh, and the dash gauge just died I expected a good bit of wrenching, so no biggie. Finding Something with minimal rust was a greater concern for me.

 

[Scottydoggs]

unplug the coolant temp sensor, both fans should default to on at full speed all the time when the key is to run. if they do come on, all your relays and harness are working fine. replace the temp sensor.

 

[Joseph Garcia]

Welcome to the Forum from NH.

You are already receiving sage advice from the knowledgeable folks on this Forum.

 

[Mudsport96]

Okay, so a c-clamp adjusted (and double zip-tied in) so there is just a little flow into the reservoir had a quick warm up and kept temps between 186 and 205 on a road test. Thanks for the assist!

Now to work on the fans. Oh, and the dash gauge just died I expected a good bit of wrenching, so no biggie. Finding Something with minimal rust was a greater concern for me.

Ok so it seems the restriction needs replaced. Don't know if you have access to one, but I used a .45acp casing with the primer removed on multiple Silverado. Just slid it into the hose and hose clamped in place.

 

[Breadman03]

Ok so it seems the restriction needs replaced. Don't know if you have access to one, but I used a .45acp casing with the primer removed on multiple Silverado. Just slid it into the hose and hose clamped in place.

That’s great! I know I’ve got 9, 10, .40, .454, .45 Colt, .308, and 5.56. Thanks for the suggestion!

Thanks for the temp sensor advice, I confirmed no power to the fans and tested the relays. All three were bad with open circuits across the coil connections. $60 at Autozone and we’ve got working fans and A/C.

 

[Joseph Garcia]

^^^^^^^^^^ Just another reason why this Forum ROCKS!

 

[Breadman03]

.45 Colt is trimmed and fit. I’m currently flushing the heater cores because there’s a slice of the old radiator…

 

[RAMurphy]

.45 Colt is trimmed and fit. I’m currently flushing the heater cores because there’s a slice of the old radiator…View attachment 411651

Holy crap....what a mess.