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No heat. I have done the following. Blown out both hoses to the heater core. Flushed the heater core. Checked the blend door. Heater core does not leak at all. Should I continue trying to flush it out or what?

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  • Cars & Trucks Master
  • 14,251 Answers

Is the thermostat working properly?If it is staying open,then coolant isn't getting hot to make heater put out hot air.Check before replacing heater core.

Posted on Dec 30, 2012

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Posted on Jan 02, 2017

  • 1 Answer

SOURCE: No Heat for 2001 Chevy Blazer

All I did with my 1999 blazer is pull the a/c fuses from under the hood and heat blows just fine.
good luck

Posted on Dec 04, 2008

cmm19987
  • 82 Answers

SOURCE: 1999 ford taurus no heat

Is the blower motor working? If not that is what it is. If it is working then check heater coil out, Could be bad heater coil.

Posted on Nov 10, 2009

  • 118 Answers

SOURCE: i have a 1998 ford f-150 and no heat. i have

You just might have an air lock. Try bleeding the system from the heater hose at the firewall. Losen one hose a little, and at operating temp. open slightly to let air out. You will lose some coolant, but just refill the rad. Now, both hoses should get hot.

Posted on Jan 01, 2010

  • 290 Answers

SOURCE: No heat/defrost 01 corolla

Sounds like you have air trapped in the heater core when you flushed the heater core. loosen the upper most heater core hose and run the engine untill coolant seeps out. Wait until the coolant has reached running temperature.

Posted on Jan 18, 2010

jturcotte
  • 7782 Answers

SOURCE: I have a 2001 Ford Taurus with heater issues.

No, there is no valve in your car. The likely problem is a clogged core. Would you like instructions for replacing it?

Posted on Dec 28, 2010

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2 Answers

I have a 2001 saturn sl2. No heat. I have flushed heater core today and replaced thermostat. Heater lines are warm. No other problems or leaks. What is causing no heat? Its cold all the time.


If after running the engine for 5 min both heater hoses are hot, it could be a blend door problem where air is not flowing thru the heater core. You may need a shop manual to troubleshoot the control.

Nov 23, 2015 | Saturn Cars & Trucks

3 Answers

I only have luke warm air coming out my ford expedition (2002) does NOT overheat ! i had it flushed out and new anti freeze put in . still kuke warm air


When you said you had it flushed out, were you talking about the radiator or the heater core. The heater core is a miniature radiator. It can get gummed up just like the big one. You will probably have to remove the heater core and have it rodded out by a radiator shop. If you have done that already then there is a problem with the regulator for the heater. Usually it is a simple valve type open and close system to allow more or less hot water into the heater core.

Jan 03, 2015 | 2002 Ford Expedition

1 Answer

Mazda b2200 heat


It is likely the electrically operated blend door is jammed and the motor is damaged. If that is the case check on eBay for a heater beater brand kit for Ranger and Mazda, as they are the same vehicle or if not the dash must be removed to service the blend door inside the ducting.

Mar 14, 2014 | Cars & Trucks

1 Answer

99 ford f150 heat works fine but after 5 minutes of driving goes ice cold !! Changes heater core checked hoses checked switch checked blend doors flushed it twice everything!! Any advice?


Could possibly be a vacuum leak. The blend door actuator controls are usually ran off of vacuum. It is possible that once the engine warms up, even though you have it to heat, the loss of vacuum will cause the blend door to switch positions.

Dec 26, 2013 | Cars & Trucks

1 Answer

No heat in car..thermostat new,flushed system,flushed heater core..still no heat


Feel the heater hoses under the hood when the vehicle is warmed up. They should both be warm.
You may also have a valve that shuts off the coolant flow on the heater hoses. The valve may be faulty.
If both heater hoses are warm up near the firewall where they enter the vehicle then you might have a bad solenoid or switch that is not operating the blend air door that moves between the A/C evaporator and heater core.

Oct 27, 2011 | 2000 Buick LeSabre

1 Answer

I have a 4cyl 1999 Jeep Wrangler. The heater only blows warm air, no hot air. I have back flushed the heater core with a garden hose and there was no clog. I have checked the t-stat and it is...


The key is the heater hoses. The top hose is the inlet for the heater core and the bottom is the return line. If the bottom hose is not hot, there is little flow through the heater core. It does not have to be completely clogged to reduce the heat output. The core needs to be flushed multiple times IN BOTH DIRECTIONS through the heater hoses. If this does not restore the heat, try a commercial/radiator flush. Many people have had alot of success by filling the core, through the heater hoses, with a CLR type product and letting it sit for 10-15 minutes to remove scale followed by a thorough flush.

Jan 08, 2011 | 1999 Jeep Wrangler

1 Answer

I have a 1998 ford f-150 and no heat. i have replaced the heater core, blend door and control switch. checked the blend door motor- works fine. have tryed 3 thermostats. when i replaced the core i back...


You just might have an air lock. Try bleeding the system from the heater hose at the firewall. Losen one hose a little, and at operating temp. open slightly to let air out. You will lose some coolant, but just refill the rad. Now, both hoses should get hot.

Jan 01, 2010 | 1999 Ford F150 Regular Cab

1 Answer

Cannot get hot heat


Alternative 1: Blend Door actuator problem

There is a TSB out on this problem. If the thermostat and everything else is good, you may have a problem with the Stratification (Secondary) Temperature Blend Door. This door is now available separately versus replacing the whole case assembly. The instrument panel needs to come off to gain access to it and this might be a job best done by a Ford Dealer.
If you think you might want to give it a shot yourself, you can get a copy of the TSB at the Ford Dealer. It is TSB number 02-23-6 dated 11/25/02. It has the repair procedure and a list of parts needed.

Alternative 2: Heater Core needs to be flushed

Check heater core hoses. If both are hot, not enough heat inside, suspect blend door actuator.
If one hose hot and the other warm or cold, the heater core need to be flushed (very common),

Dec 11, 2009 | 2000 Ford Taurus

2 Answers

Cool air blowing from heater, even when on high.


Make sure the thermostat is good, system is full, heater control valve is not bound up

Nov 19, 2008 | 1995 Dodge Dakota

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