The aftermarket Subaru thermostat is a Chevrolet V8 thermostat that was used on all v8's up through the 454 cu in. Are you saying a Subaru is more difficult to cool than a 454?

 

I guess another question is that if that thermostat isnt as good as the oem one. then should we be useing suby thermostats in chevys:)

The aftermarket Subaru thermostat is a Chevrolet V8 thermostat that was used on all v8's up through the 454 cu in. Are you saying a Subaru is more difficult to cool than a 454?

 

 

Iron V8s don't need the T-stat to open and close as quickly to regulate temperature. Plus anything with a 454 has a ginormous radiator and alot of coolant capacity. Their cooling system is actually not working as hard as ours.

 

Remeber that the thermostats real job is not cooling, it's REGULATION of the temperature. Those aftermarket T-stats open pretty quick and stay open pretty much completely once warm. Read all the posts about EA82 *overcooling*.

 

At the same time they(aftermarkets) have a smaller flow (smaller opening) which means at peak demand it can't flow enough, even though it's fully open. This means you're car can go from running too cool down a hill, then overheating going up it.

 

OEM T-stat will stay closed a bit longer, allowing for faster warm-up. They also react more quickly at their set temperature, actually restricting flow if the engine starts getting too cool like it's supposed to.

 

It really is a part that there IS a difference on.

where's the pcv valve on my 83? noob question i know

where's the pcv valve on my 83? noob question i know

 

Should be just behind the carb and then down on the backside of the manifold. You can kind of see it in the picture here. At the base of the carb is the manifold. The next thing you see attached to the manifold is the EGR and to the right of that is the PCV. I don't have a mousepaint to circle it though.

 

in this area? circled in yellow:

 

Yarp! Looks like you got it.

Iron V8s don't need the T-stat to open and close as quickly to regulate temperature. Plus anything with a 454 has a ginormous radiator and alot of coolant capacity. Their cooling system is actually not working as hard as ours.

 

Remeber that the thermostats real job is not cooling, it's REGULATION of the temperature. Those aftermarket T-stats open pretty quick and stay open pretty much completely once warm. Read all the posts about EA82 *overcooling*.

 

At the same time they(aftermarkets) have a smaller flow (smaller opening) which means at peak demand it can't flow enough, even though it's fully open. This means you're car can go from running too cool down a hill, then overheating going up it.

 

OEM T-stat will stay closed a bit longer, allowing for faster warm-up. They also react more quickly at their set temperature, actually restricting flow if the engine starts getting too cool like it's supposed to.

 

It really is a part that there IS a difference on.

 

?????????

 

Chevrolet had an aluminum engine option. Granted, there wern't alot of em built BUT they used the same cooling system parts as the cast iron engines.

 

Subarus can't flow as much coolant as Chevrolet. Subaru radiator hoses are smaller, and the radiator coolant passages and the physical dimensions of the radiator are much smaller. Take the tanks off a Subaru radiator and you will see how small the tubes are.

 

I personally have not used anything BUT Chevrolet thermostats for the last 18 years in my Subarus and have NEVER had any problems of any kind with them.

Additional information: we live at 9000 ft above sea level and frequently drive up to and through the Eisenhower Tunnel on Interstate 70 which is over 11,000 ft above sea level. We even occasionally drive up Mt. Evans and Pikes Peak which are both over 14,000 ft. High elevations = very thin air = extreme stress on a cooling system. I have never experienced a cooling system problem with any of my Subarus by using aftermarket thermostats. Anyone blaming aftermarket thermostats for their problems should check their radiators for restricted air flow or scale inside the radiator.

 

Sorry, you can compare thermostats side by side all you want but that doesn't tell you anything about how they work in real life.

Smelly Cat asked what size wrench to use on the valve. I removed mine last night with 19mm. 18mm was too small.

I drive a 1989 GL Subaru Sedan. Does it have this valve?

Yes. Should be the same place on your engine, even though it's fuel injected. But here's a picture anyway:

 

Dunno if anyone said this yet, But does it matter what brand PCV you go with? I'll prolly just go to the dealer anyway. But I figurd i'd ask for the heck of it.

I got my pvc valve off, It rattled, I de gunk ified it and reinstalled, I guess it was working. my 84GL 5spd seems the same. Maybe I get 26-27 mpg, I was hoping it would fix my wicked idle high idle low, but no dice.

 

 

sc

Dunno if anyone said this yet, But does it matter what brand PCV you go with? I'll prolly just go to the dealer anyway. But I figurd i'd ask for the heck of it.

 

Don't buy Fram. Mine stuck in just 500 miles.

Don't buy Fram. Mine stuck in just 500 miles.

 

Yeah don't worrie about that! I won't and don't buy any Fram crapp!!

I personally have not used anything BUT Chevrolet thermostats for the last 18 years in my Subarus and have NEVER had any problems of any kind with them.

 

I don't see a problem with running one for a 350. Especially a Delco unit. The problem one's are the aftermarket units made specifically for Subaru engines. And also cheap aftermarket units that have a high failure rate.

 

Whatever you use, make sure it's for at least as large of a cooling system as you have, and that it's a QUALITY unit. Look it over carefully.

 

I personally run the Subaru OEM thermostats - for several reasons:

 

1. Built like tanks.

2. Comes with a WAY better gasket.

3. Inexpensive ($13).

4. Unquestionably the right part.

5. I've never had one fail.

 

GD

I don't see a problem with running one for a 350. Especially a Delco unit. The problem one's are the aftermarket units made specifically for Subaru engines. And also cheap aftermarket units that have a high failure rate.

 

Whatever you use, make sure it's for at least as large of a cooling system as you have, and that it's a QUALITY unit. Look it over carefully.

 

I personally run the Subaru OEM thermostats - for several reasons:

 

1. Built like tanks.

2. Comes with a WAY better gasket.

3. Inexpensive ($13).

4. Unquestionably the right part.

5. I've never had one fail.

 

GD

 

I'll add: 6. A Chevy unit doesn't have a jiggle valve. Bleed air, flat aluminum engine, head cracks.

 

I worked on a 403 c.i. Oldsmobile "Way" back when. It had an impressive Robert Shaw in it then. It still has that same unit in it today. That's 20+ years ago. What these folks are saying, is that there "is" junk out there, and there "is" a difference.

 

No jiggle valve and or a hole in a Subaru thermostat. I will never use one like that. My 02

 

Doug