Engine not reaching operating temperature

[bottomline2000]

thanks for the info ill let you guys know if the new pump and matching housing work. Here is the pump im going to get. (link is to an ebay listing.)

https://www.ebay.com/itm/Gates-Engi...:ShippingMethodStandard!46360!US!-1:rk:2:pf:0

This is the only one that ive found that has a matching housing. There was one more but it had poor reviews.

It's either this or your engine is running backwards lol..good looking pump, Gates makes a quality product.

I will say when I did my engine swap the 5.3 thermostat was too small for the 6.0 water pump, but they didn't fit at all. Hopefully this fixes the problem.

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[Doubeleive]

that gates is on rock auto for $94 plus shipping, then there is a %5 off vendor code in the vendor section which usually ends up cutting the shipping cost in half, they are pretty reasonable on shipping already so you may save a few bucks getting it from rockauto instead


actually amazon wins this time
https://www.amazon.com/Gates-45006-...F8&qid=1543540744&sr=8-2&keywords=GATES+45006

 

[Chiller449]

Nice!! i figured ebay would have been the cheapest. Its even a prime item on amazon. Thanks a bunch!

 

[Doubeleive]

Nice!! i figured ebay would have been the cheapest. Its even a prime item on amazon. Thanks a bunch!

sometimes ebay is but not always i like to poke around a little just to make sure first

 

[Chiller449]

Update! last weekend I received the new Gates pump in the mail. It has the new thermostat and housing installed already. Just had to pop the housing off to install the housing gasket. It went on just like it should. But the problem still remains. I still have coolant running through the top house on the overflow tank and the truck still will not warm up unless I plug that hose off. Things to note: When I installed the housing gasket and went to put the housing back on I noticed that the bottom of the thermostat seemed to be hitting the pump before the housing would sit flush against the pump. I would say maybe a quarter inch gap. You can press it down so it fits but it compresses the spring on the thermostat. This to me sounds like the problem but this is the 5th stat Iv'e put on and they all do that. Every parts store guy says that's the only stat this thing calls for and that's what Gates says is the oem stat for the truck. I did notice that there is a hose holder on the fan shroud that is not being used. So maybe when I installed the radiator I did not hook the hoses back up where they are supposed to go? The top hose from my surge tank runs to the top passenger side of the radiator. Just below the big hose that runs to the thermostat. At the passenger side of the radiator about in the middle I have another hose that runs to the throttle. Im thinking I might have these 2 switched? I don't see what else could be the problem other than I somehow have my belt screwed up and its turning the pump backwards. I doubt this as I followed the diagram to a t. Any ideas? I will post some pics if I can figure out how to upload them to this site. Thanks!

 

[bottomline2000]

Update! last weekend I received the new Gates pump in the mail. It has the new thermostat and housing installed already. Just had to pop the housing off to install the housing gasket. It went on just like it should. But the problem still remains. I still have coolant running through the top house on the overflow tank and the truck still will not warm up unless I plug that hose off. Things to note: When I installed the housing gasket and went to put the housing back on I noticed that the bottom of the thermostat seemed to be hitting the pump before the housing would sit flush against the pump. I would say maybe a quarter inch gap. You can press it down so it fits but it compresses the spring on the thermostat. This to me sounds like the problem but this is the 5th stat Iv'e put on and they all do that. Every parts store guy says that's the only stat this thing calls for and that's what Gates says is the oem stat for the truck. I did notice that there is a hose holder on the fan shroud that is not being used. So maybe when I installed the radiator I did not hook the hoses back up where they are supposed to go? The top hose from my surge tank runs to the top passenger side of the radiator. Just below the big hose that runs to the thermostat. At the passenger side of the radiator about in the middle I have another hose that runs to the throttle. Im thinking I might have these 2 switched? I don't see what else could be the problem other than I somehow have my belt screwed up and its turning the pump backwards. I doubt this as I followed the diagram to a t. Any ideas? I will post some pics if I can figure out how to upload them to this site. Thanks!

Did you install the thermostat up side down? It should sit flush in the housing without compressing the spring.

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[Chiller449]

Did you install the thermostat up side down? It should sit flush in the housing without compressing the spring.

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I installed it exactly as the gates factory sent it to me. Spring side goes into the pump. They already had the black rubber gasket on the thermostat and had it installed into the thermostat housing. All I did was put the black paper housing gasket on and bolt it back up. If you set the housing with the thermostat installed in it on the pump where it goes there is about a quarter inch gap before the housing touches the pump. The bottom of the t-stat hits the pump before the housing sits flush against the pump.

 

[Chiller449]

View media item 27477View media item 27476View media item 27475View media item 27474View media item 27473View media item 27472View media item 27471View media item 27470
Photos I finally got around to taking please let me know if you have any questions.

 

[Doubeleive]

My 03 doesn't have a throttle body hose but this is how it is routed

 

[bottomline2000]

View media item 27477View media item 27476View media item 27475View media item 27474View media item 27473View media item 27472View media item 27471View media item 27470
Photos I finally got around to taking please let me know if you have any questions.

Can't see any pictures. Does your serpentine belt wrap around the pump like this?

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[Chiller449]

Can't see any pictures. Does your serpentine belt wrap around the pump like this?

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Yep, so my water pump is definitely not turning backwards. well, I'm out of ideas. I guess my last step is to take it to the dealer. Ive taken it to a couple local shops and they have no idea. Any other ideas guys? I might just leave that hose plugged permanently if i cant figure this out.

 

[swathdiver]

How about your radiator cap? Have you replaced or tested it?

 

[Doubeleive]

i'd say take off your intake tube and the top fan shroud and post up some pictures of how everything is connected, something is screwy

 

[Chiller449]

How about your radiator cap? Have you replaced or tested it?

I have not, But i dont see how it could cause a problem. It heats up just fine and holds alot of pressure if i keep that tube plugged. Ill have it tested though.

i'd say take off your intake tube and the top fan shroud and post up some pictures of how everything is connected, something is screwy

Ok ill see if i can get some better pics tomorrow.

 

[Fless]

@Chiller449, this is how my 2004 is routed. The clamped line at the surge tank goes to the top radiator port. The lower radiator port hose runs up alongside the upper radiator hose back to the TB. Couldn't tell if yours was run that way from your pics.

 

[TJ Baker]

I took this opportunity to get acquainted with my own 2005 Yukon cooling hoses. The unused hose mounting clip you mentioned holds the hose going to the throttle body on mine. I noticed you have the hose from the radiator to the upper surge tank routed below the engine air intake. Mine is routed over the top of the air intake much the same as another posters photo. Just for the heck of it try rerouting that.

I don't remember you saying where your surge tank fill level is. Just now I noted mine is just slightly higher than the cold fill level mark at the middle of the tank , at what looks like a seam left from manufacture.

You mentioned replacing a fan clutch. My Yukon has none, I have electric fans. I run the Torque Pro app and my normal operating temp is right about 190. I just now let it idle until at full operating temperature[ and observed no fluid flow through the upper surge tank hose. Perhaps that hose is there as you say, as a safety to allow some flow under higher rpms when the thermostat is closed.

 

[Fless]

I took this opportunity to get acquainted with my own 2005 Yukon cooling hoses. The unused hose mounting clip you mentioned holds the hose going to the throttle body on mine. I noticed you have the hose from the radiator to the upper surge tank routed below the engine air intake. Mine is routed over the top of the air intake much the same as another posters photo. Just for the heck of it try rerouting that.

Rerouting the upper hose over the air intake would be a good thing to try, as well as bringing up the lower hose from the radiator (going to the throttle body) and clipping it into the clip on the fan shroud.

If you want other pics, let us know what you'd like to see.

 

[afpj]

I wonder if there’s something screwy with the radiator. Is that bigger radiator a factory option or completely aftermarket? Just thinking out loud. As others have said, with engine warmed up I don’t have flow into the coolant overflow tank on any active basis. It sits at a higher level than when cold but I don’t see coolant churning around, like if you were to look at your power steering reservoir with the engine running.

 

[Doubeleive]

nothing really makes any sense, have you done a pressure test?. you said you took it to a mechanic and they couldn't figure it out did they do a pressure test?, maybe there is a crack in the upper part of the reservoir tank? bad cap like James mentioned? looking at the picture of your reservoir tank again it looks like where you have the capped off line connected there is some coolant/corrosion under it and it looks like there may be cracks in the tank right there? not sure that would cause the problem but I would take a closer look. I would even go so far as to guess since capping that line makes pressure and then it works right, then the reservoir tank/cap is maybe the problem, a new tank and cap aren't much money wise for like a dorman I think a dorman is like $25-30 and maybe slightly more at the dealer for a oem one

 

[bottomline2000]

@Chiller449, this is how my 2004 is routed. The clamped line at the surge tank goes to the top radiator port. The lower radiator port hose runs up alongside the upper radiator hose back to the TB. Couldn't tell if yours was run that way from your pics.


View attachment 212129

I think u may have foumd the problem. If he's got this tube routed lower than the radiator top so it's probably pushing fluid which is why he's seeing flow from it and why the truck heats up when he blocks it. He's creating an open loop that is bypassing the thermostat.

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