Comments on: False Temp Reading & Heater Switch…….. http://www.toyotatrucksclub.com/false-temp-reading-heater-switch Fri, 03 Feb 2012 13:58:14 +0000 hourly 1 http://wordpress.org/?v=3.3.1 By: admin http://www.toyotatrucksclub.com/false-temp-reading-heater-switch/comment-page-1#comment-5413 admin Sat, 27 Feb 2010 12:43:34 +0000 http://www.toyotatrucksclub.com/false-temp-reading-heater-switch#comment-5413 <p>gregory trimper wrote: <br /> > Ron Domino wrote: <br /> </p><p>> > On my bare-bones factory '93 P/U with a 22R, it seems that when I turn <br /> > > on the heater on it causes the engine temp. gauge to red-line SUDDENLY... <br /> </p><p>> Is this when you turn on the fan, or move the temp slider from cold to hot? <br /> </p><p>> If the fan, then it is most likely the engine ground strap.  Locate it, <br /> > remove it, clean and burnish it, and reinstall. Will probably fix that <br /> > problem, as well as other intermittent gauge flutters you may have seen. <br /> <br />Well, that seems to be the solution!!! <br /> </p><p>If the problem arises again, I'll proceed w/ Mr. Brown's suggestion. <br /> </p><p>Many thanks gentlemen! <br /> </p><p>- Hide quoted text -- Show quoted text -</p><p>> If the slider, then it is happening when you're opening/closing the coolant <br /> > path to the heater core, and then see Roger Brown's response re: tstat. <br /> </p><p>> >Turning the engine and the heater off, then restarting USUALLY resets <br /> > t>he problem. <br /> </p><p>> Saying that turning the engine and off resetting it (i.e. the engine hasn't <br /> > cooled down) leads me to beleive that it is electrical, and thus the ground <br /> > strap.  Common 22RE problem.  I've done it several times in Celicas and <br /> > trucks. <br /> </p><p>> good luck! <br /> > GTr <br /> <br /> </p> gregory trimper wrote:
> Ron Domino wrote:

> > On my bare-bones factory ’93 P/U with a 22R, it seems that when I turn
> > on the heater on it causes the engine temp. gauge to red-line SUDDENLY…

> Is this when you turn on the fan, or move the temp slider from cold to hot?

> If the fan, then it is most likely the engine ground strap.  Locate it,
> remove it, clean and burnish it, and reinstall. Will probably fix that
> problem, as well as other intermittent gauge flutters you may have seen.

Well, that seems to be the solution!!!

If the problem arises again, I’ll proceed w/ Mr. Brown’s suggestion.

Many thanks gentlemen!

- Hide quoted text — Show quoted text -

> If the slider, then it is happening when you’re opening/closing the coolant
> path to the heater core, and then see Roger Brown’s response re: tstat.

> >Turning the engine and the heater off, then restarting USUALLY resets
> t>he problem.

> Saying that turning the engine and off resetting it (i.e. the engine hasn’t
> cooled down) leads me to beleive that it is electrical, and thus the ground
> strap.  Common 22RE problem.  I’ve done it several times in Celicas and
> trucks.

> good luck!
> GTr

]]> By: admin http://www.toyotatrucksclub.com/false-temp-reading-heater-switch/comment-page-1#comment-5411 admin Sat, 27 Feb 2010 12:43:33 +0000 http://www.toyotatrucksclub.com/false-temp-reading-heater-switch#comment-5411 <p></p><p>- Hide quoted text -- Show quoted text -</p>Ron Domino wrote: <br /> <p>> On my bare-bones factory '93 P/U with a 22R, it seems that when I turn <br /> > on the heater on it causes the engine temp. gauge to red-line SUDDENLY. <br /> > When I turn it off the heater, and the needle swings back to normal, but <br /> > will <br /> > have an erratic, quick movements between normal and red-line. <br /> </p><p>> Turning the engine and the heater off, then restarting USUALLY resets <br /> > the problem. <br /> </p><p>> If the heater switch is kept off, the temp gauge works properly. <br /> </p><p>> The truck is not overheating and the thermostat is working. <br /> </p><p>> Would a sensor fail with these characteristics? <br /> > Anyone know the relation between the sensor and the heater switch? <br /> <br />A common problem and an easy fix: <br /> </p><p>http://4crawler.cruiserpages.com/4x4/CheapTricks/index.shtml#Thermostat <br /> </p><p>There is a TSB for this problem, too. <br /> </p>

- Hide quoted text — Show quoted text -

Ron Domino wrote:

> On my bare-bones factory ’93 P/U with a 22R, it seems that when I turn
> on the heater on it causes the engine temp. gauge to red-line SUDDENLY.
> When I turn it off the heater, and the needle swings back to normal, but
> will
> have an erratic, quick movements between normal and red-line.

> Turning the engine and the heater off, then restarting USUALLY resets
> the problem.

> If the heater switch is kept off, the temp gauge works properly.

> The truck is not overheating and the thermostat is working.

> Would a sensor fail with these characteristics?
> Anyone know the relation between the sensor and the heater switch?

A common problem and an easy fix:

http://4crawler.cruiserpages.com/4×4/CheapTricks/index.shtml#Thermostat

There is a TSB for this problem, too.

]]> By: admin http://www.toyotatrucksclub.com/false-temp-reading-heater-switch/comment-page-1#comment-5412 admin Sat, 27 Feb 2010 12:43:33 +0000 http://www.toyotatrucksclub.com/false-temp-reading-heater-switch#comment-5412 <p>Ron Domino wrote: <br /> > On my bare-bones factory '93 P/U with a 22R, it seems that when I turn <br /> > on the heater on it causes the engine temp. gauge to red-line SUDDENLY... <br /> <br />Is this when you turn on the fan, or move the temp slider from cold to hot? <br /> </p><p>If the fan, then it is most likely the engine ground strap.  Locate it, <br /> remove it, clean and burnish it, and reinstall. Will probably fix that <br /> problem, as well as other intermittent gauge flutters you may have seen. <br /> </p><p>If the slider, then it is happening when you're opening/closing the coolant <br /> path to the heater core, and then see Roger Brown's response re: tstat. <br /> </p><p>>Turning the engine and the heater off, then restarting USUALLY resets <br /> <br />t>he problem. <br /> </p><p>Saying that turning the engine and off resetting it (i.e. the engine hasn't <br /> cooled down) leads me to beleive that it is electrical, and thus the ground <br /> strap.  Common 22RE problem.  I've done it several times in Celicas and <br /> trucks. <br /> </p><p>good luck! <br /> GTr <br /> </p> Ron Domino wrote:
> On my bare-bones factory ’93 P/U with a 22R, it seems that when I turn
> on the heater on it causes the engine temp. gauge to red-line SUDDENLY…

Is this when you turn on the fan, or move the temp slider from cold to hot?

If the fan, then it is most likely the engine ground strap.  Locate it,
remove it, clean and burnish it, and reinstall. Will probably fix that
problem, as well as other intermittent gauge flutters you may have seen.

If the slider, then it is happening when you’re opening/closing the coolant
path to the heater core, and then see Roger Brown’s response re: tstat.

>Turning the engine and the heater off, then restarting USUALLY resets

t>he problem.

Saying that turning the engine and off resetting it (i.e. the engine hasn’t
cooled down) leads me to beleive that it is electrical, and thus the ground
strap.  Common 22RE problem.  I’ve done it several times in Celicas and
trucks.

good luck!
GTr

]]>