94 Overheating - Page 4

gmctrucks · 11-04-2009, 08:54 PM

If you do change out the head buy new head bolts. I'm still wondering what's going on with your truck any progress?

hotrodpc · 11-04-2009, 10:18 PM

Quote:

Originally Posted by Crmzendrgone

A blockage to the heater core or your blend air doors are not redirecting air flow pass the heater core.

Well you have to ask is it worth the lose of coolant and another gasket for it not to be the Tstat?

I agree on the blocked blend door, but usually even if its blocked, you can still feel some kind of heat seeping thru somewhere, even if you have to put your hands under the dash near the heater core, you could still feel the heat in most cases, even if the AC was on, unless there was a blockage valve to keep the water from circulating through the heater core are part of the heat and air system. Which some vehicles do have.

Just for purposes of trying it, and being a new fresh gasket, I'd almost say that gasket will still hold well enough to give it a try if you want to remove the tstat altogether and try it. Hopefully you did not use hardening permatex on the gasket. If you did, the gasket will tear then likely would NOT work a second time, fresh or not.

XJMUDDER · 11-05-2009, 11:25 AM

I guess we are going to try the t stat and see what happens , i moved the switch for the blend door and you could hear it switch but didn't make a diffrents in the heat plus no air in this truck. for right now its sitting trying to get all the ideas we can and plan on going at it this weekend ( i hope ! )

XJMUDDER · 11-09-2009, 07:01 PM

Ok guys we took the tstat out filled it back up and it never boiled over , we ran it a good 15 mins. we then took it up the road and back temp guage read about 1/2 but never boiled over so this morning we checked the radiator and its down maybe a quirt ? looked it all over no leaks checked the oil and it looked good , did a pressure check this morning and it didn't loose any stayed good after all that we ran it again for awhile no smoke , nothing in oil and no leaks that we could see so where did the water go ? and do you think it was just the aftermarket tstat that was giving us the problem ? also it seemed to be flowing through the radiator really good

XJMUDDER · 11-09-2009, 07:02 PM

also should say that this time we had heat coming out the heater vents and last time with the tstat in nothing.

hotrodpc · 11-09-2009, 07:52 PM

Great, sounds like you bought a defective thermostat, or possibly had it installed upside down. As far as losing water, you say a quart??? That is probably because you actually filled the complete cooling system, burped any air out of it, filled the heater core etc while running it. Also keep in mind, as water heats, it expands. So if you are filling it to the very top, then driving it, you are going to lose some water out the overflow as the water expands. You can actually expect it to be an inch or 2 lower than the top of the radiator AFTER it cools back down from reaching full temp. Sounds to me like some very good news and you have found the problem. Now, get you a good working thermostat. Exchange that one you bought, and if its not a fail safe, be sure to see if they will let you upgrade it to fail safe if its not already. And do be sure to install it propelry.

Crmzendrgone · 11-10-2009, 09:22 AM

Yep sounds like that was the issue. I agree and second everything Hotrod said so no need to double up the reading time writing it all over again

11-09-2009, 07:52 PM	#36
hotrodpc Senior Member Join Date: Jul 2008 Location: OKC, OK Posts: 3,177	Great, sounds like you bought a defective thermostat, or possibly had it installed upside down. As far as losing water, you say a quart??? That is probably because you actually filled the complete cooling system, burped any air out of it, filled the heater core etc while running it. Also keep in mind, as water heats, it expands. So if you are filling it to the very top, then driving it, you are going to lose some water out the overflow as the water expands. You can actually expect it to be an inch or 2 lower than the top of the radiator AFTER it cools back down from reaching full temp. Sounds to me like some very good news and you have found the problem. Now, get you a good working thermostat. Exchange that one you bought, and if its not a fail safe, be sure to see if they will let you upgrade it to fail safe if its not already. And do be sure to install it propelry. __________________ *Winners NEVER Quit , Quitters NEVER Win !!!*

11-10-2009, 09:22 AM	#37
Crmzendrgone Senior Member Join Date: Apr 2009 Location: Arizona Posts: 1,420	Yep sounds like that was the issue. I agree and second everything Hotrod said so no need to double up the reading time writing it all over again __________________ ENGINES PRODUCE POWER. MOTORS RECEIVE POWER. https://lastroundbestround.com/Home_Page.html

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11-04-2009, 08:54 PM	#31
gmctrucks Senior Member Join Date: Nov 2006 Location: Houston,Texas Posts: 4,035	If you do change out the head buy new head bolts. I'm still wondering what's going on with your truck any progress?

11-05-2009, 11:25 AM	#33
XJMUDDER Senior Member Join Date: Nov 2008 Location: Vermont Posts: 73	I guess we are going to try the t stat and see what happens , i moved the switch for the blend door and you could hear it switch but didn't make a diffrents in the heat plus no air in this truck. for right now its sitting trying to get all the ideas we can and plan on going at it this weekend ( i hope ! )

11-09-2009, 07:01 PM	#34
XJMUDDER Senior Member Join Date: Nov 2008 Location: Vermont Posts: 73	Ok guys we took the tstat out filled it back up and it never boiled over , we ran it a good 15 mins. we then took it up the road and back temp guage read about 1/2 but never boiled over so this morning we checked the radiator and its down maybe a quirt ? looked it all over no leaks checked the oil and it looked good , did a pressure check this morning and it didn't loose any stayed good after all that we ran it again for awhile no smoke , nothing in oil and no leaks that we could see so where did the water go ? and do you think it was just the aftermarket tstat that was giving us the problem ? also it seemed to be flowing through the radiator really good

11-09-2009, 07:02 PM	#35
XJMUDDER Senior Member Join Date: Nov 2008 Location: Vermont Posts: 73	also should say that this time we had heat coming out the heater vents and last time with the tstat in nothing.