Replaced craked heater core,cylinder heads, water pump, timing chain, and tune up. Also new IAC, fuel and airfilter, ECM module, both coolant sensors,thermostat, coollant, and alternator. after start up the engine runs smoothly but soon after it warms up ( guage shows 190ish ) the engine will violently stall. I replaced the coolant sensors and the guage showed the engine was over 260 quickly. I didn't quite trust it though and replace it again new one shows the engine goes to 200 then drops back to 160 repeatedly. After driving for 5 or 6 miles the engine starts to stall violently and then quits. If it is overheating what is causing it and why won't the gauge indicate it?
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you may have a clogged heater core or heater core bypass valve may be stuck closed. bypass valve is usually on the firewall on one of the heater core hoses. if valve seems to be operating properly. you will need to let the vehicle cool down. disconnect both heater hoses. connect garden hose to one side of heater core let water run through one side and then the other side. if the heater core is too clogged it may need to be replaced.
UNHOOK BOTH HEATER HOSES AND FLUSH OUT HEATER CORE
DO IT FOWARD AND BACK FLUSH / COVER DIST. CAP OR YOU WILL
FILL IT WITH WATER / IF IT CLEARS OUT HOOK HOSES BACK UP AND
BLEED AIR OUT OF SYSTEM / IF IT DOES'T CLEAR OUT HEATER CORE
WILL NEED TO BE REPLACED (DASH COMES OUT TO DO HEATER CORE)
Replace your A/C Actuator. most common problem is that the heater vents get stuck in the closed position blocking the heat from entering the vents. I just replaced mine in my truck and it works like a champ now.
Check coolant level. Check for heat at the heater hose going from water pump to heater core at firewall. Check to see that cable is moving coolant control valve from the closed to open position. Low mileage so it shouldn't be plugged heater core.
hate to ask but did you put the thermostat in rightside up ? and someone else might be right did you bleed the system and get the air out of it? sometimes there is a air lock that will drive you crazy.. another thing when you replaced the water pump did it heat up before you changed it ?? if so did you put right gaskets on it for correct flow.. ? thanks Jerry if you have more holler
I have seen this many times before. The sound is air being forced out of the radiator cap and escaping back into the coolant recovery bottle. It can be as simple as a new radiator cap or as costly as cylinder head crack, or even block cracked. It is important that your radiator be completely full with proper coolant mix and have a good working order cap with the proper pressure.
be more specific,head unit could mean cylinder head/s could mean thermostat unit,were the hoses hooked up right? thermostat should be checked before installing,very easy to do could be stuck shut.was the heater core checked or flushed out?lots of maybys,wish it was in my garage..