heater control valve

1973olds98 · October 26th, 2009, 10:40 PM

iam in the process of putting my 455 back together and was wondering what plugs into the heater control valve...Is it some sort of sensor..

Lady72nRob71 · October 27th, 2009, 06:27 AM

The heater valve screws into the rear right of the block. The big hose goes to the heater core and the tiny hose inlet on the valve is for the vacuum control hose. That hose would go to the heater controls. I think in 1973, vacuum applied = valve off.
Not sure if this helps, but I hope so...

Olds64 · October 27th, 2009, 06:29 AM

There is also an electric sensor that goes to the heater control valve. At least in my 71 98 there is. I'm not really sure what it is used for. There is a bung in one side of the valve where the sensor screws into.

Lady72nRob71 · October 27th, 2009, 08:43 AM

Does the car in question have the auto temp controls??
If so, thats a good explanation of an electrical sensor - I never have seen that...

rocketraider · October 27th, 2009, 08:56 AM

The threaded port is for a coolant temperature sensor for Comfortron equipped cars. Most all the valves have the port since it was probably cheaper to have one p/n for all applications than different valves for each type of A/C.

Comfortron is designed to not operate until the car has warmed up sufficiently (coolant temp >120 degrees) to provide heat. The water valve sensor does this. Two wires to it, black with double white stripe at passenger rear of engine.

If car does not have Comfortron, the threaded port is not used.

1973olds98 · October 27th, 2009, 09:14 AM

ok the sensor part was what i was referring to..Mine does have it..i was just wondering what it was and how it works..

joe_padavano · October 27th, 2009, 11:08 AM

Quote:

Originally Posted by 1973olds98

ok the sensor part was what i was referring to..Mine does have it..i was just wondering what it was and how it works..

The sensor is a temp sensor that should prevent the blower motor from coming on until the coolant warms up to prevent blowing cold air at the passengers.

Olds64 · October 27th, 2009, 11:42 AM

My car has the temp sensor. It might not be working properly because my blower no longer works. I was thinking I might have a vacuum leak as well. I need to check it out.

joe_padavano · October 28th, 2009, 04:57 PM

Quote:

Originally Posted by Olds64

My car has the temp sensor. It might not be working properly because my blower no longer works. I was thinking I might have a vacuum leak as well. I need to check it out.

Easy enough to test. Simply pull the connector off the temp sender, jumper across the terminals in the harness connector, and see if the fan runs. Alternately, check continuity at the sender terminals with the engine cold and again with the engine hot.

Olds64 · October 29th, 2009, 06:43 AM

Quote:

Easy enough to test. Simply pull the connector off the temp sender, jumper across the terminals in the harness connector, and see if the fan runs. Alternately, check continuity at the sender terminals with the engine cold and again with the engine hot.

I'm sorry, I don't understand. You say check continuity at the sender terminals; however, there is only one terminal on the temp sensor that attaches to the heater control valve.

joe_padavano · October 29th, 2009, 06:33 PM

Quote:

Originally Posted by Olds64

I'm sorry, I don't understand. You say check continuity at the sender terminals; however, there is only one terminal on the temp sensor that attaches to the heater control valve.

OOPs, sorry, I'm working off the later model cars that use the two-wire sender. In your case, check continuity to ground.

Olds64 · October 30th, 2009, 05:54 AM

Thanks!

October 26th, 2009, 10:40 PM	#1 (permalink)
1973olds98 Registered User Join Date: Jun 2009 Posts: 215	heater control valve iam in the process of putting my 455 back together and was wondering what plugs into the heater control valve...Is it some sort of sensor..

October 27th, 2009, 06:27 AM	#2 (permalink)
Lady72nRob71 Moderator Join Date: Feb 2008 Location: Plano, TX Posts: 1,916	The heater valve screws into the rear right of the block. The big hose goes to the heater core and the tiny hose inlet on the valve is for the vacuum control hose. That hose would go to the heater controls. I think in 1973, vacuum applied = valve off. Not sure if this helps, but I hope so... __________________ -Rob Young 1972 Cutlass Supreme Convertible (442 clone) -"Lady" (My mistress...) http://www.flickr.com/photos/robsalbum/sets/ 1986 Cutlass Supreme Coupe - "Pristine" 1978 Ford (Old Faithful) a.k.a. "the Tramp" 1997 Cadillac STS (for sale - too many cars!) 1999 Harley Davidson Sportster - "the Freedom Machine"

October 27th, 2009, 06:29 AM	#3 (permalink)
Olds64 Landyacht Club President Join Date: Jul 2007 Location: Lawton, OK Posts: 4,286	There is also an electric sensor that goes to the heater control valve. At least in my 71 98 there is. I'm not really sure what it is used for. There is a bung in one side of the valve where the sensor screws into. __________________ Ferris, my father loves this car more than life itself... Apparently, you don't understand! Ferris, he never drives it! He just rubs it with a diaper! Cameron Frye Ferris Bueller's Day Off 1986

October 27th, 2009, 08:43 AM	#4 (permalink)
Lady72nRob71 Moderator Join Date: Feb 2008 Location: Plano, TX Posts: 1,916	Does the car in question have the auto temp controls?? If so, thats a good explanation of an electrical sensor - I never have seen that... __________________ -Rob Young 1972 Cutlass Supreme Convertible (442 clone) -"Lady" (My mistress...) http://www.flickr.com/photos/robsalbum/sets/ 1986 Cutlass Supreme Coupe - "Pristine" 1978 Ford (Old Faithful) a.k.a. "the Tramp" 1997 Cadillac STS (for sale - too many cars!) 1999 Harley Davidson Sportster - "the Freedom Machine"

October 27th, 2009, 08:56 AM	#5 (permalink)
rocketraider Oldsdruid Join Date: Dec 2007 Location: Danville Vajenya, the Last Capital of Dixie Posts: 1,214	The threaded port is for a coolant temperature sensor for Comfortron equipped cars. Most all the valves have the port since it was probably cheaper to have one p/n for all applications than different valves for each type of A/C. Comfortron is designed to not operate until the car has warmed up sufficiently (coolant temp >120 degrees) to provide heat. The water valve sensor does this. Two wires to it, black with double white stripe at passenger rear of engine. If car does not have Comfortron, the threaded port is not used. __________________ I know absolutely nothing about Oldsmobiles. Just ask the owner of Oldspower.com

October 27th, 2009, 09:14 AM	#6 (permalink)
1973olds98 Registered User Join Date: Jun 2009 Posts: 215	ok the sensor part was what i was referring to..Mine does have it..i was just wondering what it was and how it works..

October 27th, 2009, 11:42 AM	#8 (permalink)
Olds64 Landyacht Club President Join Date: Jul 2007 Location: Lawton, OK Posts: 4,286	My car has the temp sensor. It might not be working properly because my blower no longer works. I was thinking I might have a vacuum leak as well. I need to check it out. __________________ Ferris, my father loves this car more than life itself... Apparently, you don't understand! Ferris, he never drives it! He just rubs it with a diaper! Cameron Frye Ferris Bueller's Day Off 1986

October 30th, 2009, 05:54 AM	#12 (permalink)
Olds64 Landyacht Club President Join Date: Jul 2007 Location: Lawton, OK Posts: 4,286	Thanks! __________________ Ferris, my father loves this car more than life itself... Apparently, you don't understand! Ferris, he never drives it! He just rubs it with a diaper! Cameron Frye Ferris Bueller's Day Off 1986

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