Temp gauge starts is at middle when first started?
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Temp gauge starts is at middle when first started?
I've been having overheating issues with my 4runner. The head has been replaced, as well as the thermostat. But when you start the truck, the gauge is either at cold(left, obviously) or right in the middle. Then all of a sudden within 15 minutes of driving, it's near red
Does it sound like the gauge is shot or may something else be causing it?
Thanks
Does it sound like the gauge is shot or may something else be causing it?
Thanks
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That cast aluminum piece that the upper rad hose attaches to comes to mind. My aftermarket temp sender is in the upper rad hose and it reads a little hotter than the factory coolant temp sender (for OBDII) does so I'm guessing that upper radiator hose is pretty close to max heat for the coolant.
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Aim the temp gun at the front of the head (watch out for the fan), get it as close as you can to the head casting and hold the trigger for a couple seconds so the gun will average out any irregular spots. Do not temp the rad to diagnose a cooling issue unless you are specically looking for rad temp. If the t-stat is stuck it won't be hot. If the gauge is jumping around it's likely that it's a sender or gauge issue.
#10
Aim the temp gun at the front of the head (watch out for the fan), get it as close as you can to the head casting and hold the trigger for a couple seconds so the gun will average out any irregular spots. Do not temp the rad to diagnose a cooling issue unless you are specically looking for rad temp. If the t-stat is stuck it won't be hot. If the gauge is jumping around it's likely that it's a sender or gauge issue.
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No but it's a good place to check if the t-stat is open. Actually yes you could get a good reading there (assuming t-stat is open) but we're really not concerned with the coolant temp, it's the temperature of the head that is more important, as this is what's being cooled- i.e; being kept from overheating.
KCRunner- Did whoever changed the head check to make sure that the steam holes are not plugged up? they're pretty small and I've seen so called "remanufactured" heads come with plugged steam holes.
KCRunner- Did whoever changed the head check to make sure that the steam holes are not plugged up? they're pretty small and I've seen so called "remanufactured" heads come with plugged steam holes.
Last edited by SoCalWheeler71; 06-29-2007 at 05:49 AM.
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Yeah, the head came from J&C Engineering, really clean. Actually, I should stated earlier that this problem was happening before I the timing chain snapped and the HG blew.
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