Overheating '93 V6

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Old 20 Jun 2006, 05:15 pm   #1 (permalink)
giblet
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Default Overheating '93 V6

History:
Overheated after about 10 miles at 70mph, spotted it straight away and
pulled over. Taken home on an AA truck. Put it into a non-Toyota garage
who replaced the radiator cap and core.....goodbye to 350 quid

Overheated again after about 100 miles at 70mph (coolant level was
definitely ok at radiator cap at start of journey), spotted it straight
away and pulled over. Taken home on an AA truck. Guy in the garage
hasn't got a clue. I'm not going back to that muppet. Have been using
the car since and topping up the coolant with about 100ml for every 20
mile trip (fortunately this is not the main family car and I can use it
for my commute only, never more than 20 mile trips).

After scrutiny, the symptoms are as follows:

When parked up after the engine has been hot the expansion tank is
overflowing, leaving a puddle under the car
The top hose looks partially collapsed indicating a partial vacuum
When I remove the radiator cap the vacuum is released and air enters
the system giving me the room to put the water in
The engine pings like crazy as it cools down, not having overheated
according to the temperature gauge. I don't know if this normal for a
Camry..it was second hand and has always done it since I've owned it
Engine and transmission oil do not emulsify
Engine starts and runs smoothly, power seems ok
Exhaust seems fine, no smoke/steam
Heater works ok (except when it is right out of coolant)

Anyone out there that can advise me please?

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Old 20 Jun 2006, 05:36 pm   #2 (permalink)
mrdarrett@gmail.com
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Default Re: Overheating '93 V6


giblet wrote:
> History:
> Overheated after about 10 miles at 70mph, spotted it straight away and
> pulled over. Taken home on an AA truck. Put it into a non-Toyota garage
> who replaced the radiator cap and core.....goodbye to 350 quid
>
> Overheated again after about 100 miles at 70mph (coolant level was
> definitely ok at radiator cap at start of journey), spotted it straight
> away and pulled over. Taken home on an AA truck. Guy in the garage
> hasn't got a clue. I'm not going back to that muppet. Have been using
> the car since and topping up the coolant with about 100ml for every 20
> mile trip (fortunately this is not the main family car and I can use it
> for my commute only, never more than 20 mile trips).
>
> After scrutiny, the symptoms are as follows:
>
> When parked up after the engine has been hot the expansion tank is
> overflowing, leaving a puddle under the car
> The top hose looks partially collapsed indicating a partial vacuum
> When I remove the radiator cap the vacuum is released and air enters
> the system giving me the room to put the water in
> The engine pings like crazy as it cools down, not having overheated
> according to the temperature gauge. I don't know if this normal for a
> Camry..it was second hand and has always done it since I've owned it
> Engine and transmission oil do not emulsify
> Engine starts and runs smoothly, power seems ok
> Exhaust seems fine, no smoke/steam
> Heater works ok (except when it is right out of coolant)
>
> Anyone out there that can advise me please?



Off the top of my head... has the thermostat been replaced recently?

When's the last time the water pump was replaced? (How many miles has
the car been driven again?)

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Old 20 Jun 2006, 08:43 pm   #3 (permalink)
jg
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Default Re: Overheating '93 V6


"giblet" <gilbert2uk@yahoo.co.uk> wrote in message
news:1150841757.920188.18800@y41g2000cwy.googlegro ups.com...
> History:
> Overheated after about 10 miles at 70mph, spotted it straight away and
> pulled over. Taken home on an AA truck. Put it into a non-Toyota garage
> who replaced the radiator cap and core.....goodbye to 350 quid
>

Could be a leaking head gasket, letting gas into the water jacket making it
hot. A restriction might cause the top hose to collapse (does it feel
hard?) - that might be thermostat or perhaps a buildup of leak stopper...
which might have blocked up the radiator. I had that once, cooling system
was half empty but a restriction made it look full. Then it's hard to tell
if the problem began with a leak or the head gasket failure. Not cheap to
fix but the car seems fine after 12 months so it was probably worth it.


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Old 20 Jun 2006, 09:28 pm   #4 (permalink)
m Ransley
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Default Re: Overheating '93 V6

Start with a new thermostat, but use a Toyota, ive has a few bad
aftermarket ones. Check the lb rating on the pressure cap to be sure
they put the right one in, any garage can tests its pressure release to
be sure its good. Do you fill the expansion tank to the line marked on
it, if you just fill it to the top it will overflow. You do run a 50%
antifreeze mix, right.

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Old 20 Jun 2006, 09:30 pm   #5 (permalink)
m Ransley
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Default Re: Overheating '93 V6

You should be able to tell a head gasket leak by the oil looking milky

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Old 20 Jun 2006, 10:47 pm   #6 (permalink)
jg
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Default Re: Overheating '93 V6


"m Ransley" <ransley@webtv.net> wrote in message
news:13435-4498AF55-989@storefull-3138.bay.webtv.net...
> You should be able to tell a head gasket leak by the oil looking milky
>

That's only one of the possible symptoms, so are; coolant overflowing,
bubbles in the coolant, oil in the coolant and overheating for no apparent
reason. Not wishing it on giblet, but I have had very similar experiences.
Trying shortcuts to stop leaks has been a big mistake twice for me.


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Old 21 Jun 2006, 05:23 am   #7 (permalink)
giblet
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Default Re: Overheating '93 V6


mrdarrett@gmail.com wrote:
>
> Off the top of my head... has the thermostat been replaced recently?

No, I think it is the original
>
> When's the last time the water pump was replaced? (How many miles has
> the car been driven again?)

The water pump was replaced about 5,000 miles ago by the same guy who
can't solve my problem now. He said he had spotted a leak. When he
chacked it after the overheat, he said it looked fine, no problem.

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Old 21 Jun 2006, 12:04 pm   #8 (permalink)
Daniel
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Default Re: Overheating '93 V6

giblet wrote:
> History:
> Overheated after about 10 miles at 70mph, ---
> The top hose looks partially collapsed indicating a partial vacuum


> Anyone out there that can advise me please?

=====================
First of all, insist the mechanic use genuine Toyota parts and replace
the thermostat and radiator cap.
If the problem is still there, then write back.
If you look at the Toyota radiator cap, it fits a small filler neck,
and has several moving pieces to allow coolant to be drawn back in from
the recovery bottle. The actual opening in the filler neck isn't much
more than half an inch, so an aftermarket cap could be one source of
the problem.
Here's another tip, though it might not make much difference.
There's a "jiggle valve" in the new thermostat, and it should be
aligned with the cast in mark on the inlet pipe, near "12 o'clock"
position.
Also, make sure he knows the new gasket wraps around the edge of the
thermostat, but that should be obvious.
Also make sure the thermostat is not installed backwards. The printing
indicating the opening temperature and the short tapered part of the
thermostat faces out.

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Old 21 Jun 2006, 06:50 pm   #9 (permalink)
davemac
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Default Re: Overheating '93 V6

This has the classic symptom of a blown head gasket. Prolonged highway
driving is usually the only thing that puts enough stress on the
cooling symptom to have it overheat with a gasket issue. Happened to
my wife's '93 camry exactly the same. Go get yourself a chemical block
tester kit for $25 and check for exhaust gases in the coolant. If
positive, then get a leakdown tester or somethng similar and test each
cylinder with pressurized air and slowly hand turn the engine
crankshaft from the wheel well while observing the coolant reservoir.
When you see bubbles, you have found your leak.

dave mc

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Old 21 Jun 2006, 11:09 pm   #10 (permalink)
johngdole@hotmail.com
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Default Re: Overheating '93 V6

Agreed, likely a blown head gasket.

But the rad cap is probably bad as well. Make sure you get one with a
metal spring-loaded vacuum return valve ($8 at Kragens), not one with
the hanging plastic valve like the one Toyota likes to sell. It should
have allowed coolant back without causing the top hose to collapse.

The major issue first is finding out if the gasket is blown. If so, I'd
use only Fel-Pro's multi-layer steel (MLS) head gasket on that engine.


davemac wrote:
> This has the classic symptom of a blown head gasket. Prolonged highway
> driving is usually the only thing that puts enough stress on the
> cooling symptom to have it overheat with a gasket issue. Happened to
> my wife's '93 camry exactly the same. Go get yourself a chemical block
> tester kit for $25 and check for exhaust gases in the coolant. If
> positive, then get a leakdown tester or somethng similar and test each
> cylinder with pressurized air and slowly hand turn the engine
> crankshaft from the wheel well while observing the coolant reservoir.
> When you see bubbles, you have found your leak.
>
> dave mc


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