Question about 1994 Toyota Pickup

6 Answers

Truck over heats instantly

My son's '94 Toyota 2wd 5speed manual all of a sudden overheats quickly. Thermostat was recently replaced...gaskets and all seals just done...radiator replaced...coolant proper level...oil clear. What would cause it to overheat instantly from a cold engine...driven 3 blocks...to redlined? Would a clutch fan do that?

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  • gleegal67 May 21, 2009

    It's a 4.5liter engine.



    I'll take out the theromostat and see if it is installed backwards...but I know it has been driven for almost 700 miles with no problem...since the thermostat was replaced.



    Thanks!

  • gleegal67 May 21, 2009

    My apologies...I'm trying to remember from the paperwork...it is a 2.4 liter engine.

  • Dave  C
    Dave C May 11, 2010

    Wow, huge response, could you just confirm that engine size please, 4.5L ?

  • Richard Scordino May 11, 2010

    I'm not looking for backwards, it may be defective. Yes there are other options, but lets not go there yet.

  • Dave  C
    Dave C May 11, 2010

    Which engine?

  • Richard Scordino May 11, 2010

    Take the thermostat out temporarily and see if anything changes. Dont want to say cracked head or warped head...yet/

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Backwards themostat, or water pump.

Posted on May 21, 2009

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The fan clutch will effect cooling if it's not turning the fan, and effect performance if it's seized up. A broken shaft or impellar in the water pump will cause engines to overheat quickly.
When you refer to "instantly" overheat...it makes me wonder if the thermostat is installed backwards?? Are you getting coolant circulation through the block and radiator? Is the top radiator hose as hot as the bottom one? Last but not least...is it actually hot,,,and not a defective gauge reading?
Remove the thermostat...leave the radiator cap off and see if coolant circulates...this will also help "purge" any air in it.
Hope this helps and will fixya up...good luck.

Posted on May 21, 2009

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CHECK COOLANT FOR PRESENCE OF CARBON MONOXIDE. bLOWN HEAD GASKET.

Posted on May 21, 2009

  • newman45 May 21, 2009

    When the engine is stone cold open the radiator cap to make certain no ptressure exists. replace the cap and run the engine for 5 minutes. now remove the cap, if any pressure escapes, you have a blown head gasket or a cracked head.

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You probably did all this cooling system work because the engine overheated. If the engine was run in a overheated state for any significant amount of time you probably have a blown head gasket.

A blown head gasket can displace the coolant with combustion gases and cause the engine to heat up rapidly. A repair shop could use a gas analyzer to check for the prescence of combustion gases in the coolant or you can buy a block check kit from your local autoparts store to verify a blown head gasket.

Another way is to pull the spark plugs, (check for coolant on plugs) and pressurize the cooling system with a pressure tester. Coolant will leak into the cyclinders if the head gasket is blown.

Your engine is not a 4.5L, they did not make any engine bigger than 3.0L in 1994 (Except Lexus). If you have a V6 Toyota, had a recall in this timeframe for headgaskets and you *may* still be covered. Talk to your local dealer to see if this is possible.

Posted on May 21, 2009

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Has it overheat from day one of putting a new thermostat in?
if so it might be in backwards.
check to see if there are traces of water running down the water pump, if so the pump is probably bad.
check to see if the fan is kicking on, but i dont think the fan would allow it to heat up that fast,
i think you have a thermostat or water pump problem
check to make sure your belt that drives the water pump is there, it may have broke and fallen off without you even knowing it.
hope this helps.
would appreciate you leaving some feed back for me
thanks

Posted on May 21, 2009

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Chances are, and I know this sounds kind of stupid, that the thermostat was installed backwards. I had the same problem once, after replacing the entire cooling system it still overheated and that is what the issue was. I would definitely check that. I hope this helps and please don't forget to rate me.

Posted on May 21, 2009

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