Temperature delima ..

grillen85 · 11-04-2009, 10:18 PM

OK here is the deal , some of you may have seen/read my tstat thread.
Well anyways the tstat an gaskets are new , the truck when putting water back in it the guage did not go crazy at all while sitting and running an letting the new tstat cycle to add water and what not ..

Well tonight is the first night I have driven it SINCE putting the new tstat in , well needless to say I get about half way to where I was going my my temp guage in the truck starts jumping around all crazy agian ..

180* - 240* - 180* - 240* - 180* - 240*
(mind you it is factory guage an these are estimates.)

But the weird thing is , it only jumps for like MAYBE 5 - 10 second and its back down to normal agian , like steady going up and down up and down like in SECONDS... Like if the truck was really running this hot I would think it wouldnt jump and down like this ..

needless to say , I do not think the truck is running warm .. it has no symptoms of running warm , its not making any bubbling noises and I can hold my hand on the radiator for 10-20 seconds without feeling like I am getting burnt. Like if it was really running that hot I doubt I would be able to touch the radiator or the rad. hoses .

Anyways , does anyone else have any suggestions ?

I am now leaning towards the temp. sensor being bad.

lesterl · 11-04-2009, 10:57 PM

Temp Sensor in the back of the head on drivers side. The one in the Tstat neck is for the ECM.

grillen85 · 11-04-2009, 11:14 PM

OK cool , thanks !

grillen85 · 11-08-2009, 02:46 PM

Hrmmmmm..... ok so ...

Today I decided to mess with it again an well I just let it idle in my drive way an the temp. does climb to like 220-230 for a few second (30 or so) an then it drops BACK down to 180* it will stay around there for awhile an go back up to 200-230 for a few seconds and then drop back down again..

Yet I can still hold onto the rad. and the rad hose after it has been running an also the overflow is not bubbling.

Still sound like the sensor to you guys ? The waterpump isnt leaking out the Pee Hole , like 99% of the WPs that I have replaced have been right before the took a complete dump ..

TIA ,
Eddie

bansheeair · 11-08-2009, 11:56 PM

Sounds like the temp sensor on the back of the head to me. Sending out pulses.

Shaddix · 11-09-2009, 03:16 PM

99% of bad waterpumps do melt/corrode the core plug and they start to weep out and leak. I however, have heard of pump impellers on the inside being the cause of a pump going bad and not leaking outside the block at all, just spinning nothing.

Being that it is so rapid, ,maybe yah got an air bubble in the coolant system, or that your gauge is just flat out lying =)

grillen85 · 11-09-2009, 03:46 PM

See that is the thing with the pump not pee'ing that was odd to me , an like if the truck WERE running that hot I would think the overflow resi. would be bubbling NO ?

I also thought possible air bubble , but the truck started doing it after 2 yrs of me owning it , so that kinda ruled it out for me .. No ? I am going to replace the sensor and see what happens.

wi11ie · 11-15-2009, 10:46 AM

I have had impellers on the pump on my duke rust the hell off even in a clean system and not push shit thru the radiator...
Just a note..

grillen85 · 11-19-2009, 03:34 PM

Well a little up ...

New temp switch (back of head),T stat, Water pump ...

an the guage is still going crazy , I do not think the truck is over heating..
But this guage is about to drive me up the wall..

Any Idea's ???

Shaddix · 11-19-2009, 03:43 PM

Quote: Originally Posted by grillen85

Well a little up ...

New temp switch (back of head),T stat, Water pump ...

an the guage is still going crazy , I do not think the truck is over heating..
But this guage is about to drive me up the wall..

Any Idea's ???

If you have absolutly a 100% working cooling system, then I would assume you have a wiring problem. Probably grounding out on something or pinched.

When you fill your cooling system up, do you run the engine until it gets the thermostat to open with the radiator cap off? If not, then you may have a large air bubble in the coolant neck. Make sure its all the way warmed up to 180 and then put the cap on.

lesterl · 11-19-2009, 09:22 PM

Try another Tstat, switch brands, OEM is good.

grillen85 · 11-19-2009, 10:39 PM

Quote: Originally Posted by Shaddix

If you have absolutly a 100% working cooling system, then I would assume you have a wiring problem. Probably grounding out on something or pinched.

When you fill your cooling system up, do you run the engine until it gets the thermostat to open with the radiator cap off? If not, then you may have a large air bubble in the coolant neck. Make sure its all the way warmed up to 180 and then put the cap on.

Yes , I ran the truck for a good 30 mins at idle after getting everything back together to let the coolant cycle through out the engine. I was also thinking an air bubble .. I drove the truck to a show this past saturday and the temp guage was going up and down like explained , But the truck did not seem to be overheating in any way ..

I am going to put an aftermarket mechanical gauge in it just to make sure.

11-04-2009, 10:18 PM	#1
grillen85 Registered User Age: 27 Join Date: May 2005 Posts: 548 Location: User is: OffLine	Temperature delima .. OK here is the deal , some of you may have seen/read my tstat thread. Well anyways the tstat an gaskets are new , the truck when putting water back in it the guage did not go crazy at all while sitting and running an letting the new tstat cycle to add water and what not .. Well tonight is the first night I have driven it SINCE putting the new tstat in , well needless to say I get about half way to where I was going my my temp guage in the truck starts jumping around all crazy agian .. 180* - 240* - 180* - 240* - 180* - 240* (mind you it is factory guage an these are estimates.) But the weird thing is , it only jumps for like MAYBE 5 - 10 second and its back down to normal agian , like steady going up and down up and down like in SECONDS... Like if the truck was really running this hot I would think it wouldnt jump and down like this .. needless to say , I do not think the truck is running warm .. it has no symptoms of running warm , its not making any bubbling noises and I can hold my hand on the radiator for 10-20 seconds without feeling like I am getting burnt. Like if it was really running that hot I doubt I would be able to touch the radiator or the rad. hoses . Anyways , does anyone else have any suggestions ? I am now leaning towards the temp. sensor being bad.
	[Reply w/Quote]

11-04-2009, 10:57 PM	#2
lesterl Wire Splicin Fool :-) Age: 30 Join Date: May 2008 Posts: 4,408 Location: Harrisonville, MO User is: OffLine	Re: Temperature delima .. Temp Sensor in the back of the head on drivers side. The one in the Tstat neck is for the ECM.
	[Reply w/Quote]

11-04-2009, 11:14 PM	#3
grillen85 Registered User Age: 27 Join Date: May 2005 Posts: 548 Location: User is: OffLine	Re: Temperature delima .. OK cool , thanks !
	[Reply w/Quote]

11-08-2009, 02:46 PM	#4
grillen85 Registered User Age: 27 Join Date: May 2005 Posts: 548 Location: User is: OffLine	Re: Temperature delima .. Hrmmmmm..... ok so ... Today I decided to mess with it again an well I just let it idle in my drive way an the temp. does climb to like 220-230 for a few second (30 or so) an then it drops BACK down to 180* it will stay around there for awhile an go back up to 200-230 for a few seconds and then drop back down again.. Yet I can still hold onto the rad. and the rad hose after it has been running an also the overflow is not bubbling. Still sound like the sensor to you guys ? The waterpump isnt leaking out the Pee Hole , like 99% of the WPs that I have replaced have been right before the took a complete dump .. TIA , Eddie
	[Reply w/Quote]

11-08-2009, 11:56 PM	#5
bansheeair Registered User Join Date: Oct 2009 Posts: 13 Location: BC User is: OffLine	Re: Temperature delima .. Sounds like the temp sensor on the back of the head to me. Sending out pulses.
	[Reply w/Quote]

11-09-2009, 03:16 PM	#6
Shaddix Registered User Join Date: Apr 2003 Posts: 148 Location: Astoria, Oregon User is: OffLine	Re: Temperature delima .. 99% of bad waterpumps do melt/corrode the core plug and they start to weep out and leak. I however, have heard of pump impellers on the inside being the cause of a pump going bad and not leaking outside the block at all, just spinning nothing. Being that it is so rapid, ,maybe yah got an air bubble in the coolant system, or that your gauge is just flat out lying =)
	[Reply w/Quote]

11-09-2009, 03:46 PM	#7
grillen85 Registered User Age: 27 Join Date: May 2005 Posts: 548 Location: User is: OffLine	Re: Temperature delima .. See that is the thing with the pump not pee'ing that was odd to me , an like if the truck WERE running that hot I would think the overflow resi. would be bubbling NO ? I also thought possible air bubble , but the truck started doing it after 2 yrs of me owning it , so that kinda ruled it out for me .. No ? I am going to replace the sensor and see what happens.
	[Reply w/Quote]

11-15-2009, 10:46 AM	#8
wi11ie Registered User Age: 50 Join Date: Jan 2007 Posts: 155 Location: Houston,Tx. User is: OffLine	Re: Temperature delima .. I have had impellers on the pump on my duke rust the hell off even in a clean system and not push shit thru the radiator... Just a note..
	[Reply w/Quote]

11-19-2009, 03:34 PM	#9
grillen85 Registered User Age: 27 Join Date: May 2005 Posts: 548 Location: User is: OffLine	Re: Temperature delima .. Well a little up ... New temp switch (back of head),T stat, Water pump ... an the guage is still going crazy , I do not think the truck is over heating.. But this guage is about to drive me up the wall.. Any Idea's ???
	[Reply w/Quote]

11-19-2009, 03:43 PM	#10
Shaddix Registered User Join Date: Apr 2003 Posts: 148 Location: Astoria, Oregon User is: OffLine	Re: Temperature delima .. Quote: Originally Posted by grillen85 Well a little up ... New temp switch (back of head),T stat, Water pump ... an the guage is still going crazy , I do not think the truck is over heating.. But this guage is about to drive me up the wall.. Any Idea's ??? If you have absolutly a 100% working cooling system, then I would assume you have a wiring problem. Probably grounding out on something or pinched. When you fill your cooling system up, do you run the engine until it gets the thermostat to open with the radiator cap off? If not, then you may have a large air bubble in the coolant neck. Make sure its all the way warmed up to 180 and then put the cap on.
	[Reply w/Quote]

11-19-2009, 09:22 PM	#11
lesterl Wire Splicin Fool :-) Age: 30 Join Date: May 2008 Posts: 4,408 Location: Harrisonville, MO User is: OffLine	Re: Temperature delima .. Try another Tstat, switch brands, OEM is good.
	[Reply w/Quote]

11-19-2009, 10:39 PM	#12
grillen85 Registered User Age: 27 Join Date: May 2005 Posts: 548 Location: User is: OffLine	Re: Temperature delima .. Quote: Originally Posted by Shaddix If you have absolutly a 100% working cooling system, then I would assume you have a wiring problem. Probably grounding out on something or pinched. When you fill your cooling system up, do you run the engine until it gets the thermostat to open with the radiator cap off? If not, then you may have a large air bubble in the coolant neck. Make sure its all the way warmed up to 180 and then put the cap on. Yes , I ran the truck for a good 30 mins at idle after getting everything back together to let the coolant cycle through out the engine. I was also thinking an air bubble .. I drove the truck to a show this past saturday and the temp guage was going up and down like explained , But the truck did not seem to be overheating in any way .. I am going to put an aftermarket mechanical gauge in it just to make sure.
	[Reply w/Quote]