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Coolant presure high heater remains cold

Done headgasket new piston high coolant presure not heater is it air lock how do i overcome

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Sounds like a few things it could be; A; is the water pump working properly, B: is the thermostat working properly (does the car come up to operating temperature around 195 degrees and remain there) C: is there any chance that maybe you are low on coolant/antifreeze, check both radiator and overflow container. D: Last of all is there any chance you may have installed the wrong head gasket or had it up side down? (if all else checks out i would assume that this is your problem.) NEED TO ASK YOURSELF WHAT CAUSED THE HEAD GASKET TO GO IN THE FIRST PLACE, BECAUSE IF YOU DON'T RESOLVE THAT ISSUE THAN IT WILL ONLY BE A MATTER OF TIME BEFORE IT HAPPENS AGAIN. Hope this helps

Posted on Nov 27, 2014

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Chris if ur heater remains cold if u full blast the fan then u need to back wash the heater core u have a blockage on the line do this before deciding to change the heater core it might save u money and time

Posted on Nov 27, 2014

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Maybe it's your thermostat. Take it out and put it boiling hot water and see if it opens or not.

Posted on Nov 27, 2014

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Posted on Jan 02, 2017

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SOURCE: 93 ford festiva heater only blows cold air.

The heater only blows HOT air when set on defrost or floor settings. If you have the lever set for vent, only cold air will come out. Check to make sure you set the controls to floor or defrost. This is standard for all Festiva's.

Posted on Nov 16, 2008

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SOURCE: heater blowing cold air with coolant, fine with plain water

it sounds like the heater core is clogged bad if u know someone with a air compressor put a air nossel on it that you pull the trigger to blos air in to the heater core after you take the lines off i had to do this before on a jeep cherokee it did the job

Posted on Jan 11, 2009

  • 6 Answers

SOURCE: heap of white smoke on startup but not always

White smoke usually occurs when there is not enough heat to burn the fuel. The unburned fuel particles go out the tailpipe and typically produce a rich fuel smell. It's not unusual to see white smoke in the exhaust during cold weather until the engine warms up.

Faulty glow plugs or control module can cause white smoke on engine start up.

Low engine cranking speed may also produce white smoke.

If white smoke is still visible after the engine has warmed up, the engine may have one or more bad injectors, retarded injection timing or a worn injection pump.

Low compression or air in the fuel system can also be a source of white smoke.

Posted on May 20, 2009

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SOURCE: 2006 Pontiac Torrent heater blowing cold air

check the heater hoses and if both are hot then the mode door is broken
i have replaced 2 in the torrents(not a nice job)

Posted on Jun 21, 2009

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SOURCE: heater blows cold air. I have replaced thermostat,

Not an expert by any means, but i know my ranger.. I had a small leak at the top of my radiator that still cooled the engine but didnt have enough pressure to get to the heater. The heater hoses travel up over the engine and just were not gettin anything to my heater core. That or make sure the heater control valve is operating.

Posted on Apr 16, 2010

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Heater slow in warming and blows cold air after warm air. Gauge has started fluctuating.

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thermostats open by virtue of the coolant getting hot and expanding a wax insert that opens the flap valve. If the thermostat is not opening then one reason is that it is in the wrong way. The body of the unit has to face the head or coolant and not the hose. Next check the cores for blockages by having a flow test done on the radiator. Sensors have nothing to do with thermostats .All they do is turn fans on or tell the CPU when the coolant is hot enough to reduce the richness of the air fuel mixture.. Ensure that there is no air lock in the cooling system as it affects the heater operation if there is air in the heater and the hot water will not flow through the core. Ensure that the heater control module (tap) is allowing the hot water to flow to the heater core.

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1. coolant leak (level too low to fill heater core)
2. headgasket leak forcing the coolant out of the overflow.
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4. bad water pump. if the impelers are broken, coolant wont flow.
5. HVAC malfunction. system may think you selected cold or is unable to move diverter. maybe a fuse,solenoid or vaccum leak? (hvac controler uses vaccume controled soleniods)
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