Issues with heater hose routing??!! - The 1947 - Present Chevrolet & GMC Truck Message Board Network

bobs86silv · 10-12-2005, 04:56 PM

I have never been able to get my truck to totally warm up. I replaced the tempeture sensor. Nothing. Checked the thermostat. None installed. Added a 195 thermostat. Now it warms up to like 1/4. the line between 100 and 210, so like maybe 150 or so. Then I checked the heater hoses. There is one coming off of the intake manifold, 5/8, leading to the heater core. A 3/4 comes from the heater core back to the radiator, right above the tranny fluid lines. Ok, so I have a constant flow of water through my radiator. How should I fix this. I do not see anywhere there should be a heat cut off switch. I am pretty sure I have always seen the return line going back to the water pump. I have an 86 silverado, 305/350. It has A/C, and heavy duty radiator option. What would be my next best course of action to unsure my motor is warming up to proper temperature.

thanks
robert

86 GMG · 10-12-2005, 05:06 PM

i have seen the hoses both ways, my truck has to be in the intake rather than the waterpump i had it to the pump and it wouldnt heatup as soon as i move to the intake bam i had heat mybe this is the problem mine is an 86 also but the motor is out of another vehicle? older block anyway. not to insult your intelegant but did you put the t-stat in with the correct side up? that would cause it not to heat up also. best luck i will watch for a thumbs up from you later

Slonaker · 10-12-2005, 07:18 PM

On my '86 the heater hose goes from the intake to the heater core, then to the radiator. That is the direction the water flows. My heater gets quite warm, and the truck warms up to the thermostat setting of 195 degrees.

The temp sensor should be located on he driver's side head between cylinders 1 and 3 I believe.

Slonaker

bobs86silv · 10-12-2005, 10:41 PM

Ive done some other reading, and it seems that there are a couple of different ways the hoses can be hooked up. I guess right now the hot water from my intake is pushed through the heater core, back to the radiator, and new, cold/cooled water is sucked from the radiator into the water pump, and into the motor, preventing it from ever warming up. I guess I could plug where the hose goes back into the radiator, and re-run the return hose into the water pump. I dont know where I should plumb it to though. I know there is a plug screwed into the top of the water pump. Is this the only place I could route the hose to?? Does this seem like the right thing to do. I only drive around in town, so I never really see extended highway driving. Maybe that is why mine is not warming all the way up. I just know winter is coming on, and it will be zero out. It is seventy now, and not warming up.

Thanks
Robert

86 GMG · 10-13-2005, 09:08 AM

i would try and move it from where it is know (intake to core and then to the radiator or waterpump to core and then to radiator) just to see what happens it wont take very long and if you are quik enough most of the antifreeze will be salvaged good luck and keep us informed

BIG82 · 10-14-2005, 02:16 PM

I am sorry I can't help you with your problem but maybe you guys can give me some advice about this. I am getting ready to hook my h hoses up and want to know the best routing.

badone07 · 10-15-2005, 12:00 AM

Quote:

Originally Posted by bobs86silv

Ive done some other reading, and it seems that there are a couple of different ways the hoses can be hooked up. I guess right now the hot water from my intake is pushed through the heater core, back to the radiator, and new, cold/cooled water is sucked from the radiator into the water pump, and into the motor, preventing it from ever warming up. I guess I could plug where the hose goes back into the radiator, and re-run the return hose into the water pump. I dont know where I should plumb it to though. I know there is a plug screwed into the top of the water pump. Is this the only place I could route the hose to?? Does this seem like the right thing to do. I only drive around in town, so I never really see extended highway driving. Maybe that is why mine is not warming all the way up. I just know winter is coming on, and it will be zero out. It is seventy now, and not warming up.

Thanks
Robert

Exactly how you described above is exactly how my truck is. Been that way since I bought it. Radiator nipple is plugged and hose rerouted to the water pump. Nipple is plugged with a recess headed pipe plug.

piecesparts · 10-15-2005, 06:40 AM

I have had this year model of truck for a long time and before that I worked on them at a County Highway Dept. I have read the discussions in this forum and I can't quite understand the thinking that is going on. First of all, if you want heating in your cab during the winter months then LEAVE the hoses connected as discussed. (5/8" hose from the intake to the heater core and then return to the radiator through the 3/4" hose). This is not affecting your engine heating up one bit. If you are having a situation where your engine is not coming up to temp in the winter, then look at T/stat for the right temperature and then how big is your radiator (2 core, 3 core or 4 core). I have numerous trucks in my possession and I have no trouble bringing them up to a warm temperature and I even run 180 T/stats. I have decent sized radiators and I even have electric fans and a large "Be Cool" radiator on the one truck. My guess is that your trouble is not the heater hoses. Have you check the temperature sending unit to be the right one for that setup. My son's truck indcates lower than most of the other trucks, but the heater is warm and there are no performance issues with the motor.

10-12-2005, 04:56 PM	#1
bobs86silv Registered User Join Date: Apr 2005 Location: Sedalia, Mo Posts: 326	Issues with heater hose routing??!! I have never been able to get my truck to totally warm up. I replaced the tempeture sensor. Nothing. Checked the thermostat. None installed. Added a 195 thermostat. Now it warms up to like 1/4. the line between 100 and 210, so like maybe 150 or so. Then I checked the heater hoses. There is one coming off of the intake manifold, 5/8, leading to the heater core. A 3/4 comes from the heater core back to the radiator, right above the tranny fluid lines. Ok, so I have a constant flow of water through my radiator. How should I fix this. I do not see anywhere there should be a heat cut off switch. I am pretty sure I have always seen the return line going back to the water pump. I have an 86 silverado, 305/350. It has A/C, and heavy duty radiator option. What would be my next best course of action to unsure my motor is warming up to proper temperature. thanks robert __________________ 86 Silverado SWB 350/350/3.08 9.7-1 Forged pistons Eagle Rods Eagle Crank Zero Deck Balanced Blueprinted 180cc DART Heads Roller Rockers RPM Intake Demon Carb Flowtech Headers 400HP/400TQ

10-12-2005, 05:06 PM	#2
86 GMG Registered User Join Date: Apr 2005 Location: Tulsa Oklahoma Posts: 943	i have seen the hoses both ways, my truck has to be in the intake rather than the waterpump i had it to the pump and it wouldnt heatup as soon as i move to the intake bam i had heat mybe this is the problem mine is an 86 also but the motor is out of another vehicle? older block anyway. not to insult your intelegant but did you put the t-stat in with the correct side up? that would cause it not to heat up also. best luck i will watch for a thumbs up from you later __________________ square body trucks an addiction or an investment either way they consume all my extra time and money

10-12-2005, 07:18 PM	#3
Slonaker Insert Witty Text Here Join Date: Oct 2002 Location: San Antonio, TX Posts: 3,415	On my '86 the heater hose goes from the intake to the heater core, then to the radiator. That is the direction the water flows. My heater gets quite warm, and the truck warms up to the thermostat setting of 195 degrees. The temp sensor should be located on he driver's side head between cylinders 1 and 3 I believe. Slonaker __________________ '86 Chevy C10 (Sold 04/19/13 ) Stock '01 Silverado

10-12-2005, 10:41 PM	#4
bobs86silv Registered User Join Date: Apr 2005 Location: Sedalia, Mo Posts: 326	Ive done some other reading, and it seems that there are a couple of different ways the hoses can be hooked up. I guess right now the hot water from my intake is pushed through the heater core, back to the radiator, and new, cold/cooled water is sucked from the radiator into the water pump, and into the motor, preventing it from ever warming up. I guess I could plug where the hose goes back into the radiator, and re-run the return hose into the water pump. I dont know where I should plumb it to though. I know there is a plug screwed into the top of the water pump. Is this the only place I could route the hose to?? Does this seem like the right thing to do. I only drive around in town, so I never really see extended highway driving. Maybe that is why mine is not warming all the way up. I just know winter is coming on, and it will be zero out. It is seventy now, and not warming up. Thanks Robert __________________ 86 Silverado SWB 350/350/3.08 9.7-1 Forged pistons Eagle Rods Eagle Crank Zero Deck Balanced Blueprinted 180cc DART Heads Roller Rockers RPM Intake Demon Carb Flowtech Headers 400HP/400TQ

10-13-2005, 09:08 AM	#5
86 GMG Registered User Join Date: Apr 2005 Location: Tulsa Oklahoma Posts: 943	i would try and move it from where it is know (intake to core and then to the radiator or waterpump to core and then to radiator) just to see what happens it wont take very long and if you are quik enough most of the antifreeze will be salvaged good luck and keep us informed __________________ square body trucks an addiction or an investment either way they consume all my extra time and money

10-14-2005, 02:16 PM	#6
BIG82 The Higher The Better Join Date: Jan 2005 Location: Springfield, Ohio Posts: 67	I am sorry I can't help you with your problem but maybe you guys can give me some advice about this. I am getting ready to hook my h hoses up and want to know the best routing.

10-15-2005, 06:40 AM	#8
piecesparts Parts and more parts Join Date: Nov 2003 Location: Lebo, Kansas (middle of nowhere Posts: 6,821	I have had this year model of truck for a long time and before that I worked on them at a County Highway Dept. I have read the discussions in this forum and I can't quite understand the thinking that is going on. First of all, if you want heating in your cab during the winter months then LEAVE the hoses connected as discussed. (5/8" hose from the intake to the heater core and then return to the radiator through the 3/4" hose). This is not affecting your engine heating up one bit. If you are having a situation where your engine is not coming up to temp in the winter, then look at T/stat for the right temperature and then how big is your radiator (2 core, 3 core or 4 core). I have numerous trucks in my possession and I have no trouble bringing them up to a warm temperature and I even run 180 T/stats. I have decent sized radiators and I even have electric fans and a large "Be Cool" radiator on the one truck. My guess is that your trouble is not the heater hoses. Have you check the temperature sending unit to be the right one for that setup. My son's truck indcates lower than most of the other trucks, but the heater is warm and there are no performance issues with the motor.



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