94 Overheating

XJMUDDER · 10-23-2009, 10:13 AM

Just bought a 94 toyota with the 3.0 motor i know/ heard that they are known to have headgasket problems , the truck i just bought has a over heating problem that the guy i bought it from isn't sure what is wrong he was told it could be the waterpump or the T-stat. right know its hard to know for sure since the neck for the radiator is broken off i was told that it would start to run hot after 20-30mis. which i would think it would since there is no neck and cap on the radiator , he said he would stop let it cool down and add some water to it ( the guy i bought it from has only had it for a few weeks and it was like that when he got it , he had planned to fix it but has about 10 other things he is working on so is getting rid of some of his progects ) i did check the oil and didn't look like there was anything in it . should i get a new radiator change the oil and do a compression check ? the truck has 140,000 on it the body is very good and it has a new frame under it as of right now i have just a few hundred into it, so what do you guys think ?

bradrhale · 10-23-2009, 11:41 AM

i wouldnt even think about head gaskets at this point. if so called guy kept adding water, than there is part of the problem. pretty soon, the system will be stripped of antifreeze and not work. coolant MUST contain antifreeze to work correctly or it will overheat. i say replace the radiator first and foremost, then go from there.
if no water in the oil, than you probably good there. a compression check is always a good way to determine how an engine has been handled but will probably not tell you anything about your overheating problem.

XJMUDDER · 10-29-2009, 06:43 PM

bradrhale , i got the new radiator comming along with a new thermostat think the problem is the stat was not opening my son JBed the neck on and after it sat for half a day he filled it up with antifreeze stated it and let it run for just a few mins. it blew the neck back off he found that the stat wasn't opening to even let the water threw so going to try the new stat. and radiator and see what happens , hope for the best !

bradrhale · 10-30-2009, 07:47 AM

can yall not find a replacement housing instead of using JB weld on something like that?? ill admit that i have had to make do before but something like that cannot be very much at a junk yard. afterall, its not like the part will wear out.

XJMUDDER · 10-30-2009, 06:31 PM

Sorry it was the neck on the radiator that was broke off he just wanted to see if he could get it to heat up so he could try and check a few things out which he did and hopefully its just the thermostat. got the new radiator this afternoon from rockauto $111.00 the t-stat will be here sat. so am hoping for good weather to get it done !

hotrodpc · 10-30-2009, 06:36 PM

Hopefully from the overheating, it has not yet blown a head gasket either. So that after you get the T stat and radiator, you'll have a running truck. I presume you got a failsafe thermostat, right?? RIGHT?? Sure you did !!!

XJMUDDER · 10-31-2009, 04:07 PM

well gotthe radiator changed along with the thermost flushed out the system best we could and to are luck she overheated so not sure whats up next i suppose its the headgasket/gaskets . is there anything else i can check for ? i don't believe its the waterpump but? also still nothing in the oil it still looks good , my son said when you replace the headgaskets you need to replace all the upper gaskets to what brand is the better to get he thought toyota is one of the better ones also is or was there ever a recall on the heads for this problem ? and is it still on going ? thanks again for any help.

bradrhale · 11-01-2009, 06:09 AM

get that headgasket idea out of your head. that is not going to cause your overheating problems. you have already mentioned that your oil has not been contaminated. new radiator and thermostat so that only leaves either the fan clutch or the water pump. why do you not believe its the water pump??

gmctrucks · 11-01-2009, 11:29 AM

Are you sure the stat is not on back-wards? Check you hoses maybe one is collapsing if it's the water pump go with a good brand pump not no mickey mouse brand. Maybe check the timing I also agree with Brad.

hotrodpc · 11-01-2009, 01:59 PM

There really is only one way that a head gasket being blown will cause overheating, and its very rare. If its blown from a cylinder to the water jacket, and compression or exhasut is getting into the cooling system. Easy to check. Pull the radiator cap off, start it up, if its blowing water out the hole, then its a blown gasket. The only other thing, that will cause it, is a cracked head in the exhaust port to a water jacket. Usually the way to tell if that is it, is a tailpipe sniffer at the opening of the radiator cap and if you are getting CO or HC measurements, you got exhaust gases in your cooling system. I have seen that happen twice in my life. Both situation I describe are very rare, so I'd do as the others have suggested and look elsewhere FIRST. If those are eliminated, then you would likely have one of these rare conditions.

10-23-2009, 10:13 AM	#1
XJMUDDER Senior Member Join Date: Nov 2008 Location: Vermont Posts: 73	94 Overheating Just bought a 94 toyota with the 3.0 motor i know/ heard that they are known to have headgasket problems , the truck i just bought has a over heating problem that the guy i bought it from isn't sure what is wrong he was told it could be the waterpump or the T-stat. right know its hard to know for sure since the neck for the radiator is broken off i was told that it would start to run hot after 20-30mis. which i would think it would since there is no neck and cap on the radiator , he said he would stop let it cool down and add some water to it ( the guy i bought it from has only had it for a few weeks and it was like that when he got it , he had planned to fix it but has about 10 other things he is working on so is getting rid of some of his progects ) i did check the oil and didn't look like there was anything in it . should i get a new radiator change the oil and do a compression check ? the truck has 140,000 on it the body is very good and it has a new frame under it as of right now i have just a few hundred into it, so what do you guys think ?

10-30-2009, 06:36 PM	#6
hotrodpc Senior Member Join Date: Jul 2008 Location: OKC, OK Posts: 3,145	Hopefully from the overheating, it has not yet blown a head gasket either. So that after you get the T stat and radiator, you'll have a running truck. I presume you got a failsafe thermostat, right?? RIGHT?? Sure you did !!! __________________ *Winners NEVER Quit , Quitters NEVER Win !!!*

11-01-2009, 01:59 PM	#10
hotrodpc Senior Member Join Date: Jul 2008 Location: OKC, OK Posts: 3,145	There really is only one way that a head gasket being blown will cause overheating, and its very rare. If its blown from a cylinder to the water jacket, and compression or exhasut is getting into the cooling system. Easy to check. Pull the radiator cap off, start it up, if its blowing water out the hole, then its a blown gasket. The only other thing, that will cause it, is a cracked head in the exhaust port to a water jacket. Usually the way to tell if that is it, is a tailpipe sniffer at the opening of the radiator cap and if you are getting CO or HC measurements, you got exhaust gases in your cooling system. I have seen that happen twice in my life. Both situation I describe are very rare, so I'd do as the others have suggested and look elsewhere FIRST. If those are eliminated, then you would likely have one of these rare conditions. __________________ *Winners NEVER Quit , Quitters NEVER Win !!!*

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10-23-2009, 11:41 AM	#2
bradrhale Senior Moderator Join Date: Apr 2006 Location: Texas Posts: 8,014	i wouldnt even think about head gaskets at this point. if so called guy kept adding water, than there is part of the problem. pretty soon, the system will be stripped of antifreeze and not work. coolant MUST contain antifreeze to work correctly or it will overheat. i say replace the radiator first and foremost, then go from there. if no water in the oil, than you probably good there. a compression check is always a good way to determine how an engine has been handled but will probably not tell you anything about your overheating problem.

10-29-2009, 06:43 PM	#3
XJMUDDER Senior Member Join Date: Nov 2008 Location: Vermont Posts: 73	bradrhale , i got the new radiator comming along with a new thermostat think the problem is the stat was not opening my son JBed the neck on and after it sat for half a day he filled it up with antifreeze stated it and let it run for just a few mins. it blew the neck back off he found that the stat wasn't opening to even let the water threw so going to try the new stat. and radiator and see what happens , hope for the best !

10-30-2009, 07:47 AM	#4
bradrhale Senior Moderator Join Date: Apr 2006 Location: Texas Posts: 8,014	can yall not find a replacement housing instead of using JB weld on something like that?? ill admit that i have had to make do before but something like that cannot be very much at a junk yard. afterall, its not like the part will wear out.

10-30-2009, 06:31 PM	#5
XJMUDDER Senior Member Join Date: Nov 2008 Location: Vermont Posts: 73	Sorry it was the neck on the radiator that was broke off he just wanted to see if he could get it to heat up so he could try and check a few things out which he did and hopefully its just the thermostat. got the new radiator this afternoon from rockauto $111.00 the t-stat will be here sat. so am hoping for good weather to get it done !

10-31-2009, 04:07 PM	#7
XJMUDDER Senior Member Join Date: Nov 2008 Location: Vermont Posts: 73	well gotthe radiator changed along with the thermost flushed out the system best we could and to are luck she overheated so not sure whats up next i suppose its the headgasket/gaskets . is there anything else i can check for ? i don't believe its the waterpump but? also still nothing in the oil it still looks good , my son said when you replace the headgaskets you need to replace all the upper gaskets to what brand is the better to get he thought toyota is one of the better ones also is or was there ever a recall on the heads for this problem ? and is it still on going ? thanks again for any help.

11-01-2009, 06:09 AM	#8
bradrhale Senior Moderator Join Date: Apr 2006 Location: Texas Posts: 8,014	get that headgasket idea out of your head. that is not going to cause your overheating problems. you have already mentioned that your oil has not been contaminated. new radiator and thermostat so that only leaves either the fan clutch or the water pump. why do you not believe its the water pump??

11-01-2009, 11:29 AM	#9
gmctrucks Senior Member Join Date: Nov 2006 Location: Houston,Texas Posts: 4,030	Are you sure the stat is not on back-wards? Check you hoses maybe one is collapsing if it's the water pump go with a good brand pump not no mickey mouse brand. Maybe check the timing I also agree with Brad.