What diameter hole on the restrictor in the heater core?
- Thread starter Rexxenexx
- Start date
The Devils Own Chariot
Active member
Re: What diameter hole on the restrictor in the heater core?
I thought the inlet and outlet of the heater cores were different sizes. I think one is 1/2 inch and the other is 3/8 inch. Im just going off distant memory here. Why are you worried about a restrictor? Just asking.
I thought the inlet and outlet of the heater cores were different sizes. I think one is 1/2 inch and the other is 3/8 inch. Im just going off distant memory here. Why are you worried about a restrictor? Just asking.
Don W.
Stab it and steer it
Re: What diameter hole on the restrictor in the heater core?
I think it's 5/8 and 3/4 but when I changed my heater a few years ago I didn't see any restrictor. All the heater cores that I've ever seen either run wide open like ours or, on older vehicles, have a control valve.
I think it's 5/8 and 3/4 but when I changed my heater a few years ago I didn't see any restrictor. All the heater cores that I've ever seen either run wide open like ours or, on older vehicles, have a control valve.
SY2455
70's Veteran
Re: What diameter hole on the restrictor in the heater core?
You are right Don it is 5/8 and 3/4 with no restrictor.
You are right Don it is 5/8 and 3/4 with no restrictor.
The Devils Own Chariot
Active member
Re: What diameter hole on the restrictor in the heater core?
Yeah I cant recall any restrictor either. Thats why I asked why you were worried about it.
Yeah I cant recall any restrictor either. Thats why I asked why you were worried about it.
warmpancakes
New member
Re: What diameter hole on the restrictor in the heater core?
ford diesels use one because the heater cores go boom
ford diesels use one because the heater cores go boom
Rexxenexx
Active member
Re: What diameter hole on the restrictor in the heater core?
That's what I did a couple years ago. When I drive the Ty I hear this wooshing sound (like *nahnahnahnahnahnahNAHNAHNAH*) in the upper RPMs, increasing the higher the RPM. It's not too bothersome in normal driving, but uphill it gets kinda annoying. I tried a plenty of times to get all the air out of the system as recommended a while back, but it never changed for better or worse so I scratched that idea. After describing it someone said -long time ago- their was a restrictor in one of the inlets that you are supposed to take out of the old one and put it in the new one.
So the tapered inlet on the heater core is supposed to act as a restrictor maybe? I thought that was to hold the restrictor? I'll take your guys word. Maybe I should disassemble it all again and see if I see something unusual. If I remember correctly the core was $19.00 from Autozone maybe I should try an OEM one or NAPA one.
That's what I did a couple years ago. When I drive the Ty I hear this wooshing sound (like *nahnahnahnahnahnahNAHNAHNAH*) in the upper RPMs, increasing the higher the RPM. It's not too bothersome in normal driving, but uphill it gets kinda annoying. I tried a plenty of times to get all the air out of the system as recommended a while back, but it never changed for better or worse so I scratched that idea. After describing it someone said -long time ago- their was a restrictor in one of the inlets that you are supposed to take out of the old one and put it in the new one.
So the tapered inlet on the heater core is supposed to act as a restrictor maybe? I thought that was to hold the restrictor? I'll take your guys word. Maybe I should disassemble it all again and see if I see something unusual. If I remember correctly the core was $19.00 from Autozone maybe I should try an OEM one or NAPA one.
vortecfiero
New member
Re: What diameter hole on the restrictor in the heater core?
a restrictor on the heater core system is an old trick for an engine that tends to over heat
when getting on the pedal. It basically reduces the coolant that isnt cooling the engine and
puts it back to work. I have used rubber washer with about a 1/4 hole for summer and then
took it completely out as we get brutal winters here.
basically it routes just enough to the heater core to create heat and lets the rest be used to
cool the engine. If your engine rarely gets hot i wouldn't bother with it
keep in mind that power pulleys reduce the water pump speed and so reduce the flow to
the heater core and the whole system as well. In the winter at idle there is very little or no
heat as the air is colder than the amount of heat available in the core. I used to have to keep
my idle at about 1200 in the winter till I figured that out.
a restrictor on the heater core system is an old trick for an engine that tends to over heat
when getting on the pedal. It basically reduces the coolant that isnt cooling the engine and
puts it back to work. I have used rubber washer with about a 1/4 hole for summer and then
took it completely out as we get brutal winters here.
basically it routes just enough to the heater core to create heat and lets the rest be used to
cool the engine. If your engine rarely gets hot i wouldn't bother with it
keep in mind that power pulleys reduce the water pump speed and so reduce the flow to
the heater core and the whole system as well. In the winter at idle there is very little or no
heat as the air is colder than the amount of heat available in the core. I used to have to keep
my idle at about 1200 in the winter till I figured that out.
