My 92 diesel nissan terrano is sitting at an abnormally hot temperature. Any ideas why? Thanks!
Is the thermostat opening? Either take it out and test it in hot water, to check if it is opening, or just replace it.
Is the temperature sender unit faulty? The engine temperature might be fine, but the gauge may be getting lied to.
Check in the radiator, remove the cap (not when hot, as if boiling, and the pressure is released it will all want to revert to steam instantly, and will scald with a fountain of steam), and look for scum or oil and when running, check for bubbles and exhaust gas smell in the radiator, these would indicate a leaking cylinder head gasket, or cracked cylinder block, or cracked cylinder head.
Another potential, is that the transmission is running hot (heavy towing in overdrive ?), as the radiator has the transmission oil lines going into the bottom, and is used as an inter-cooler for the transmission oil.
Is there antifreeze / corrosion inhibitor in the cooling system, and is it still active (not expired), as the dissimilar metals in motors, act like a battery (electro-galvanic corrosion), this will cause pin holes of corrosion to eat through the cylinder cooling jacket, and allow hot exhaust gas / oil / coolant to mix. All engines, especially modern ones, need antifreeze / corrosion inhibitor, and prferably deionized water, so that the coolant is not an electrolyte.
Aug 18, 2013 |
Cars & Trucks