Overheating

[TomsSVX]

Originally Posted by longassname

huh? Isn't the only thing that could stop coolant from circulating through the heater core the water pump(besides disconnecting it)? I believe the heater lines connect directly to the water pump so even if the thermostat is closed the coolant circulates through the heater core.

Though I guess the mix door on his ac system could be coincidentally broken and not that just disconnecting the outlet hose from the engine and watching for it to pump is a bad idea.

Sorry for the confusion but I was agreeing with you that there is no valve. If the heater core is full of air, your are not going to get any heat out of it through... I had this problem with my old 94 when the HG was bad.

Tom

[kwren]

when you start the car the heater core is just about the only thing the coolant goes through till you get enough temperature to make the thermostat start to gradually open. On an svx any air in a heater core would be gone in seconds.

Merry Christmas everyone.

Keith

[oab_au]

Originally Posted by kwren

when you start the car the heater core is just about the only thing the coolant goes through till you get enough temperature to make the thermostat start to gradually open. On an svx any air in a heater core would be gone in seconds.

Merry Christmas everyone.

Keith

"Not only but also".

There are two paths that the coolant can use till the thermostat opens. The heater runs off the right hand side of the water outlet manifold, through the heater back to the pump inlet. There is a by-pass pipe also, that runs off the left hand side of the water outlet manifold, back to the pump inlet.

The water will flow through the path of less resistance. That is the By-pass.

Harvey.

[kwren]

Originally Posted by oab_au

"Not only but also".

There are two paths that the coolant can use till the thermostat opens. The heater runs off the right hand side of the water outlet manifold, through the heater back to the pump inlet. There is a by-pass pipe also, that runs off the left hand side of the water outlet manifold, back to the pump inlet.

The water will flow through the path of less resistance. That is the By-pass.

Harvey.

Merry Christmas Harvey!

Dang Harvey, I was thinking that other pump thingie was a return for the heater I should have checked to make sure.

Like my old dad used to say... "That's what you get for doing your own thinking"

I should get your Christmas DVD movie on the road next Tuesday. So sorry about that

Take care,
Keith

[TomsSVX]

well think about the statement logically, if the heat is not working... obviously the car is at running temperature. If the car reaches operating temp and the heat is not working and the temp starts to rise above operating temp, then my guess would be a seized water pump. If the water pump is seized, you will also hear smell the timing belt burn as is slides over the frozen pulley.

Tom

[kwren]

My water pump seized in my 90 legacy and if I had had a blanket I could have sent up smoke signals

[TomsSVX]

Originally Posted by kwren

My water pump seized in my 90 legacy and if I had had a blanket I could have sent up smoke signals

exactly, when a pump stops turning it makes an awful mess of things... My guess is air in the system due to a HG failure

Tom

[coco-puff]

Originally Posted by TomsSVX

well think about the statement logically, if the heat is not working... obviously the car is at running temperature. If the car reaches operating temp and the heat is not working and the temp starts to rise above operating temp, then my guess would be a seized water pump. If the water pump is seized, you will also hear smell the timing belt burn as is slides over the frozen pulley.

Tom

huh.....I have a noise every once in a while but no smell...

[TomsSVX]

Well, it might be best to pull the timing covers off and look at the water pump while you turn the engine over to see if the pump is locked. If not, start the car briefly and make sure the pump is turning easily and that the noise you hear is not from it

Tom

[svxfiles]

When my hexwifes 1.8 Impreza's water pump siezed, the car could idle for hours with no noise, no smoke, and no overheating....
But if you drove it one mile super overheating!!!
Pegged the temp gauge, and boiled over!

[coco-puff]

Originally Posted by TomsSVX

Well, it might be best to pull the timing covers off and look at the water pump while you turn the engine over to see if the pump is locked. If not, start the car briefly and make sure the pump is turning easily and that the noise you hear is not from it

Tom

Ugh, I was afraid I was going to have to to do this. Either way, looks like I need to sit down and work on my car deeper.

Originally Posted by svxfiles

When my hexwifes 1.8 Impreza's water pump siezed, the car could idle for hours with no noise, no smoke, and no overheating....
But if you drove it one mile super overheating!!!
Pegged the temp gauge, and boiled over!

F*&#!!!!!! Sounds just like my case.

[pavanbabut]

Does a bad coolant temp sensor has anything to do with over heating??

[svxfiles]

Originally Posted by pavanbabut

Does a bad coolant temp sensor has anything to do with over heating??

If the two wire sensor does not tell the ECU to turn on the fans, or turn them on at the correct temperature, YES!

[SoCal LS-L]

Originally Posted by pavanbabut

Does a bad coolant temp sensor has anything to do with over heating??

If your car overheats at idle, but returns to normal at cruising speed, then its a good clue its bad. You can also just rev the engine while sitting and watch for them to kick on and off.

[SoCal LS-L]

Crap another double post... at any rate, postcount 1UP !