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No heat in a 93 Chevy 1500 full of antifreeze blower motor only works on high. There is no visible signs that the heater core is out

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  • Cars & Trucks Master
  • 1,669 Answers

Hey guy, did you check to see if the hot water valve on the heater hose under the hood is opening and closing? If not, that's the next thing to do. Have someone sit in the car and move the temperature lever back and forth froom cool to hot and see if the valve lever is moving the total distance. If not, it is not letting hot water into the heater core. Also, check out the fan unit switch, it probably has burned out contacts on the 2 lower speeds.

Posted on Jan 05, 2013

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  • Cars & Trucks Master
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Lack of heat is probably the blend door on the heater plenum. The motor only working on one speed is the blower motor resistor. The resistor is mounted on the plenum too, Look behind the glove box for the resistor and see if the blend door lever is there. It could be controlled by vacuum or other method. Move the heat control on the panel and see w hat is supposed to move. The lever on the blend door might be loose or broken..

Posted on Jan 05, 2013

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Posted on Jan 02, 2017

SOURCE: blower speed

you need to replace the blower risistor. it should be located very close to the blower motor. it usually has 3 wires that are in a row and one wire a little to the left of it but located on the same oval fixture. go to the auto parts place and buy one . this way you will no exactly what it looks like so you do not have to spend a lot of time and money researching it.

Posted on Sep 21, 2008

leetamara
  • 702 Answers

SOURCE: Cant get heat in the cab

Make sure that you have 2 heater hoses going into the dash. These are 5/8" hoses coming from the water pump and going into the top of the engine. The 2 hoses go through the firewall into the heater core. If you don't have the 2 hoses going to the heater core, the previous owner may have it routing itself back to the engine. It the hoses are routed back to the engine, there's a chance of the heater core being bad as well and this is why it's by-passed.

Posted on Nov 09, 2008

  • 37 Answers

SOURCE: Heater only work on high

Most likely is the resistor when they fault the default to high giving you off and high only

Posted on Dec 06, 2008

  • 67 Answers

SOURCE: I have a 1998 Dodge

The motor is fine, the blower resistor is the most likely cause. All fan speeds except high go through the resistor.

Posted on Dec 08, 2008

emissionwiz
  • 75817 Answers

SOURCE: Blower motor stays on high, even with key out

the blower motor speed control module is defective, replace it.

Posted on Dec 24, 2008

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1 Answer

My car has no heat


The first thing to check is the level of coolant-is it full? Because no heat is the first indication of low coolant. When car is cool, open radiator cap and fill with a 50-50 mix of antifreeze and water. Also fill the overflow tank halfway up with the coolant mix.
Also feel both heater hoses after the car has come to normal operating temperature. Both should be hot. If they are, the heater is working as intended. If only one is hot, the coolant is not circulating through the heater, and someone will have to get that working-possibly an air block in the heater core, possibly a plugged heater core.
Finally, the blower motor may have wore out. Without the blower, very little heat will come out. Test or replace the blower motor.

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1 Answer

No heat and fan only works on high


The fan only working on high is due to a defective blower motor resistor pack which must be replaced. No heat can be a clogged heater core, defective heater control valve, or thermostat stuck open. On a 8 year old car it is time for a full cooling system service. Drain, flush, replace the thermostat, and refill with a 50/50 mix of antifreeze and distilled water.

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I have a 1994 chevy 1500 blower works full of antifreeze and hoses get tight when truck is warm but blows only cold air


if your truck is not overheating and shows no other signs of a cooling system problem, i would suspect a clogged heater core. you can try to flush it out by removing both heater hoses from the heater core, and with a garden hose, flush the core in both directions

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1 Answer

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Your thermostat may not be working properly. Coolant flows thru your heater core where the blower motor blows that heat from the coolant thru your vents. If the coolant is not warm enough wich is a sign that your thermostat may be stuck open or opening too soo, your air may be colder than normal.

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