Question about 1994 Chevrolet C1500

2 Answers

1994 C-1500 V8 - no heat

I have repalced the thermostat, drained and flushed heater core, verified the air from the fan is pushing across the heater core. When the truck is warm up to were the thermostat opens I switch the climate control from cool to hot and I get a short burst of hot air then cold flows after that. Is there another valve some were that needs to be changed or check out?

Posted by on

2 Answers

  • Level 3:

    An expert who has achieved level 3 by getting 1000 points

    All-Star:

    An expert that got 10 achievements.

    MVP:

    An expert that got 5 achievements.

    President:

    An expert whose answer got voted for 500 times.

  • Master
  • 1,201 Answers

Under the dash, behind and around the air ducts, there are vacuum operated actuator valves that operate different doors for the heat.
Trace the vacuum hoses while watching for bad hoses from the climate control to the valve,or valves. It is possible the diaphram in one of the actuator valves could be leaking air,unable to hold vacuum. Sounds like there is a vacuum leak somewhere.Hope this helps.

Posted on Jan 28, 2009

  • Level 3:

    An expert who has achieved level 3 by getting 1000 points

    Superstar:

    An expert that got 20 achievements.

    All-Star:

    An expert that got 10 achievements.

    MVP:

    An expert that got 5 achievements.

  • Chevrolet Master
  • 21,990 Answers

Something wrong with clima control ,check the thin plastic pipes have a vacumn in them ??if all else fails wedge the flap open as tis so dammed cold evan here in spain.

Posted on Jan 28, 2009

1 Suggested Answer

6ya6ya
  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

Hi,
a 6ya expert can help you resolve that issue over the phone in a minute or two.
best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
the service is completely free and covers almost anything you can think of (from cars to computers, handyman, and even drones).
click here to download the app (for users in the US for now) and get all the help you need.
goodluck!

Posted on Jan 02, 2017

Add Your Answer

Uploading: 0%

my-video-file.mp4

Complete. Click "Add" to insert your video. Add

×

Loading...
Loading...

Related Questions:

1 Answer

Lowheater (temp) output


It could be your blend door or not enough flow through your heater core. Try removing the heater hoses at the heater core and flushing both directions with a garden hose!

Dec 14, 2012 | 1997 Dodge Ram 1500 Club Cab

2 Answers

Drained radiator added prestone Radiator flush refilled and started overheating, drained radiator replaced thermostat and now I get no heat from heater,Radiator water is hot


disconnect the heat hoses going into fire wall , put hose into one with pressure and flush as it sounds like it could be bloked in the heater core,the other thing that could be the problem be the hot ,cold switch as it restricts the flow to makes the heater hoter or colder , it might need tlc or replacing as it is manaul not elec

May 08, 2012 | 1995 Toyota 4Runner

2 Answers

My truck is running cold on the freeway but when I slow down and stop it starts to heat up a little. I changed the thermostat and am going to change the heater core could it be something else


yes could be problem with the radiator fan(s) not running at any road speed. Check the fan(s) for noise-free turning by hand. Check fan fuse and relay (swap with similar relay). Turn on the air conditioner which should immediately turn on the fan(s). Overheating while driving could very well be the thermostat--you will need to drain the cooling system before replacing the unit. Blow out the radiator core with compressed air from the engine side to remove bugs and other debris first. Hope this helps!

Jan 22, 2011 | 1991 Ford Ranger Supercab

1 Answer

The heat in my 93 talon dont work. the fan blows, and i have flushed the heater core. still no heat. it is getting cold in kentucky. please help.


If you have flushed the heater, I assume you did this by removing the hoses from the thermostat housing. If there's still no heat, check

1. the thermostat is actually present. If not, put one in. If the radiator core is in bad shape, or blocked, replace the radiator.

2. the thermostat is not jammed open. If so, replace it and use a new gasket under the cap.

3. Verify that the water pump belt is not loose.

4. Remove some dash panels to get access to the heater core valve. Check that the valve is actually turning when you adjust the dash control.

Nov 01, 2010 | 1993 Eagle Talon

1 Answer

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.

Jan 17, 2010 | 2001 Toyota Corolla

1 Answer

1999 Chevy No Heat, and Overheating.


did it over heat before the therm? if not it is the wrong therm. Other than that you have to have a air pocket.

Feb 13, 2009 | 1999 Chevrolet Silverado 2500

2 Answers

No heat


sounds like an air lock joe

Nov 22, 2008 | 2001 Jeep Grand Cherokee

Not finding what you are looking for?
1994 Chevrolet C1500 Logo

123 people viewed this question

Ask a Question

Usually answered in minutes!

Top Chevrolet Experts

yadayada
yadayada

Level 3 Expert

64034 Answers

Colin Stickland
Colin Stickland

Level 3 Expert

21990 Answers

Jeff Turcotte
Jeff Turcotte

Level 3 Expert

6812 Answers

Are you a Chevrolet Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides

Loading...