My 2001 nissan frontier keeps running hot. had a new water pump replaced as well as a new thermostat installed. Also, had the head gasket replaced with a new one. But the problem isn't going away???? Any ideas?
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do a coolant system pressure test to make sure no internal leakage -cracked head--- head gasket improperly installed --warped head -and recheck the fan clutch new doesnt mean free from defects
IT MIGHT BE THE HEAD GASKET BRING IT BACK TO MECHANIC AND HAVE HIM CHECK HEAD GASKET IF ITS NOT THE HEAD GASKET ON ENGINE THEN HAVE HIM CHECK THE HEAT SENSORS
Looks like you have a leaking head gasket or cracked head. You can buy a head gasket leak detector kit that will let you know if there is CO2 gas escaping through the radiator. I think that it is this gas leak that makes it look like your radiator is boiling.
Well you covered the major points of the system. It is possible one of the hoses is collapsing internally, or a blockage inside the radiator in spite of it being flushed. I would try to see if the radiator and the block will flow with the hoses off. Another possible cause is something blocking the air flow thru the radiator. Was it running hot before the pump was replaced ? Any chance the pump is defective ?
The most probable cause of both problems is with the replacement heads. As far as knocking goes, hard to diagnose from here - usual causes are a noisy hydraulic lifter (which, if severe, should be replaced) or a failing piston bearing or incorrect head/head gasket (piston banging on head which is very serious). Also, if the head gaskets were incorrectly installed or the wrong heads were used, you could have blocked some of the cooling water ports.
Overheating can also be caused by a blocked radiator - the system circulates the cooling water into the bottom of the radiator and the water cools as it circulated up to the top and back to the engine. A quick way to check when overheating is to CAREFULLY see if there is a hot-to-cooler temperature gradient in the radiator from bottom to top.
First off you never have to drive to seal any gasket! If it did not run hot before the replacement of the pump it should not run hot now unless something is defective or improperly installed.Presure test the system for leaks first and repair any leaks before doing anything else.Be sure to make sure that the Head Gaskets are not leaking as well!
the main reasons that an engine runs hot are: 1. the thermostat is faulty( not opening) 2. the radiator is blocked 3. the water pump is faulty you will have to find which one of these is the problem before you can do anything, other problem could be a blown head gasket ....hope this helps.....cheers
check the operation of the fans, since the radiator was recently replaced, it is posible they may not be plugged in correctly or operating like they should, if they look good, look into the water pump, with the work that u already did the only this left to look at after the water pump is the intake or head gasket, any water in oil or vice versa? look into that if all else fails....
sadly it sounds like you have a blown head gasket...Does the coolant smell like exhaust? I hope you don't but, everything points in that direction. Try bleeding the coolant system.
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