Question about 1990 Ford F150

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Heater will not blow hot air, on 1990. Ford F150 5.0

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  • Ford Master
  • 946 Answers

Check the temp. gauge...........is the engine reaching running temp.?
Is the radiator full? The overflow tank at proper level?
No warm air in defrost?
Could be a bad blend door motor(vacuum or electric,probably vacuum).
don-ohio (:^)

Posted on Dec 04, 2016

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6ya6ya
  • 2 Answers

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Posted on Jan 02, 2017

dgjtex
  • 405 Answers

SOURCE: Heater wont work in my 1990 Chevy Truck

Several things can cause this (1) low coolant (2) bad coolant valve to heater core.(3) bad damper in duct.

Posted on Dec 27, 2008

alicantecoli
  • 22095 Answers

SOURCE: Ford Expedition 2002 Front Heater blows cold air below 45 MPH

impeller is made of plastic on teh water pump and its slipping and spinning on the shaft renew before weather warms up as engine will overheat

Posted on Jan 01, 2009

  • 217 Answers

SOURCE: '98 S-10 heater blowing cold air - not hot air

will the air flow switch from floor to the mid to defrost? if so then we have a problem with the tempature door actuator. easy to replace just in tight place. Keep me posted for more help or if this was any help thanks

Posted on Jan 31, 2009

localwonder
  • 6784 Answers

SOURCE: heater is blowing but its cold air not hot air 2000 expedition

Make sure the heater core is in the open position by using the shut off valve and turning it to open. next, you may have a malfunction in the direction door the directs the air flow in the dash. a lever may have become lose or separated. may be a bad servo motor not directing the door to move to the heater position. i would start by checking that shut off valve first on the heater core.

Posted on Mar 13, 2009

  • 15 Answers

SOURCE: ford ka heater blows hot air all the time

Your problem is a faulty heater control valve. The design used on these vehicles allows for hot water to flow constantly and compete with the evaporator as there is no blender door. You have to replace the valve and possibly the control head. Meanwhile, you can bypass the valve to have cold air

Posted on Sep 12, 2009

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If it's not blowing out hot air, the blend door may be the problem on the 1990 Isuzu Trooper.

Heater Water Control Valve REMOVAL & INSTALLATION On early models the heater control valve was part of the heater core inlet. To replace the control valve, remove the heater core as outlined in this section. Remove the control valve from the heater core, being careful not to damage the core. Use new gaskets when installing new valves. The remainder of the vehicles are not equipped with heater water control valves. They use heater unit doors to regulate the amount of heat entering the vehicle. --- I would check that both tubes running to the heater core are getting hot. If they are, then there is a blend door problem. If both tubes are not getting hot, the heater core is blocked somewhere or the heater control valve, if so equipped, is in need of replacement. Good luck on this repair. prev.gif next.gif

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