Heater quit blowing heat on my 2013 f150 3.5
Heater problem
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Get your truck up to temp, put max defrost/heat on high setting. pop the hood and feel the 2 heater hoses going into the firewall. they should be hot. If not, trace back the heater hoses to the valve, plastic box with hoses hooked to it. Now feel the other 2 hoses hooked to the valve if they are hot. If they are not, then you have a stuck thermostat. If they are hot, manually flip the valve open and see if the hoses going to the firewall are getting hot. If they are not, then you probably have sludge in your valve/heater core, see fix 1 below. if they are getting hot, you probably have a vacuum leak on the valve controller, pull off vacuum hose and put it on you hand to see if it pulls vacuum, if not, then you have a leak or the vacuum motor is shot. got to run than one down yourself. hopefully just sludge, fix 1...
Fix 1.
- ensure engine is cold
- pull off both heater hoses at the valve going to firewall, not the hoses at the firewall, the valve side hoses.
- put garden hose to one hose, and flush out gunk, will be a lot of stuff coming out if it is clogged, keep it running for a while till it comes out clean.
- hook it back up, get it up to temp and turn on max heat. check if heater hoses going to firewall are hot, if they are then you fixed it.
- if it quits working again, then you probably need a complete coolant flush because the gunk clogged up your heater core again.
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Can you feel the two heater hoses for hot coolant? Both hoses should feel hot after engine warmup whether heat is needed or not. Was the cooling system drained, flushed and replaced with fresh coolant to minimize corrosion and deposits forming? Are you using plain water instead of a 50/50 mix of antifreeze and water? Is the thermostat original, working at rated temperature? Does the blower motor run all speeds? Is a cabin filter used and replaced?
by F Dryer