Changing 94 Corolla water pump

On Aug 19, 8:56 am, dean.ve... RemoveThis @gmail.com wrote:
> Hey PPPL,
> How hard is it to change a water pump on a 94 corolla. Well first of
> all.. Why would a good running corolla over heatonly at freeway
> speeds? Sitting in the driveway with the AC on its perfect.... But
> when i take it out on the freeway it overheats? I changed the
> thermostat yesterday and i thought that would do it but nopoe!
> Any advise would be appreciated.
> dean..

Probably need a new radiator if the stat is ok.
I wouldn't let it overheat any more.
It is possible maybe the pump impeller is
corroded away, but I'd be leaning radiator
if it's ok at idle for extended periods of time.
I don't know if the timing belt is with the pump
on that engine, but if you do have to go into a timing
case to get to the pump, you might as well change
the timing belt also, unless it's fairly new.
You don't want to have to do all that mess twice.
There is an oil seal too probably..
But.. I almost bet your radiator is clogged up and toast..
MK
 >> Stay informed about: Changing 94 Corolla water pump 

On Sun, 19 Aug 2007 06:56:56 -0700, dean.velco.DeleteThis@gmail.com wrote:

>Hey PPPL,
>How hard is it to change a water pump on a 94 corolla. Well first of
>all.. Why would a good running corolla over heatonly at freeway
>speeds? Sitting in the driveway with the AC on its perfect.... But
>when i take it out on the freeway it overheats? I changed the
>thermostat yesterday and i thought that would do it but nopoe!
>Any advise would be appreciated.
>dean..

Your problem is with coolant flow rate. Something is restricting the
flow, could be a plugged up radiator, a bad hose that's collapsing
when the pump is running fast or you installed the thermostat
backwards/upside down. Most likely it isn't the thermostat
installation, you already had the problem when you changed that.

If the problem happened all at once, change out your hoses and see if
that fixes it. If it developed gradually, look to your radiator. Take
it to a good radiator shop and have them check it out. Don't try
those do-it-yourself radiator flushes.

Jack



---
avast! Antivirus: Outbound message clean.
Virus Database (VPS): 000766-1, 08/17/2007
Tested on: 8/19/2007 10:08:50 PM
avast! - copyright (c) 1988-2007 ALWIL Software.
http://www.avast.com
 >> Stay informed about: Changing 94 Corolla water pump 

"Retired VIP" <Jackj14321.RemoveThis@yahoo.com> wrote in message
news:pathc3tf74ma1qfjuosm7t6lbs0kurmeg1@4ax.com...
> On Sun, 19 Aug 2007 06:56:56 -0700, dean.velco.RemoveThis@gmail.com wrote:
>
>>Hey PPPL,
>>How hard is it to change a water pump on a 94 corolla. Well first of
>>all.. Why would a good running corolla over heatonly at freeway
>>speeds? Sitting in the driveway with the AC on its perfect.... But
>>when i take it out on the freeway it overheats? I changed the
>>thermostat yesterday and i thought that would do it but nopoe!
>>Any advise would be appreciated.
>>dean..
>
> Your problem is with coolant flow rate. Something is restricting the
> flow, could be a plugged up radiator, a bad hose that's collapsing
> when the pump is running fast or you installed the thermostat
> backwards/upside down. Most likely it isn't the thermostat
> installation, you already had the problem when you changed that.
>
> If the problem happened all at once, change out your hoses and see if
> that fixes it. If it developed gradually, look to your radiator. Take
> it to a good radiator shop and have them check it out. Don't try
> those do-it-yourself radiator flushes.
>
> Jack
>

Also check base ignition timing to make sure it is not too advanced.
--

Ray O
(correct punctuation to reply)
 >> Stay informed about: Changing 94 Corolla water pump