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No heat

Tiny
STCDRIVER
  • MEMBER
  • 1998 CHEVROLET ASTRO
  • V8
  • 2WD
  • AUTOMATIC
  • 125,000 MILES
Hi, have 1998 Chevy Astro van 2wd. Blower blowing cold air, rad fluid level ok and temp gauge in normal operating range.
Sunday, May 8th, 2011 AT 12:54 AM

32 Replies

Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
Hello,

It sounds like the temperature blend door actuator is not working. Here are two guides to help walk us through the repair and how to check other possible problems. the location of the actuator is in the diagrams below.

https://www.2carpros.com/articles/replace-blend-door-motor

and

https://www.2carpros.com/articles/car-heater-not-working

Check out the diagrams (Below). Please let us know what you find. We are interested to see what it is.
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Sunday, May 8th, 2011 AT 8:44 AM
Tiny
OIDAVEY
  • MEMBER
  • 0 POST
I had to buy a new actuator for $56.00 all fixed!
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Monday, December 31st, 2018 AT 12:18 PM
Tiny
KENNETH E. FARMER
  • MEMBER
  • 1 POST
  • 1998 CHEVROLET ASTRO
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 101,110 MILES
My mom has a 1998 chevy astro van. The van has frount and rear heat and air conditioning. The back blower works but no hot air comes out. Also the frount blower does not come on at all, no air comes out of any frount vent. Nothing seams to work or come on when you switch the contro nobs to different settings. Please tell me what is goin on, so I can fix my mothers heater in her van.
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Monday, December 31st, 2018 AT 12:18 PM (Merged)
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,700 POSTS
Hi:
If I remember correctly, the rear heat only works in conjunction with the front. If the fan isn't working in the front, check for power to the switch.

Let me know what you find.

Joe
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Monday, December 31st, 2018 AT 12:18 PM (Merged)
Tiny
KROFTS
  • MEMBER
  • 5 POSTS
Hi, I had the same problem with my van, no heat, I was on a trip down in virginia and the water pump went out, so I got it fixed, and the mechanic told me that the antifreeze that gm puts in their auto's the yellow stuff, eats seals. The mechanic replaced the water pump and put the green antifreeze in and i've had heat ever since
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Monday, December 31st, 2018 AT 12:18 PM (Merged)
Tiny
CL1976
  • MEMBER
  • 1 POST
  • 1998 CHEVROLET ASTRO
  • 6 CYL
  • AWD
  • AUTOMATIC
  • 130,000 MILES
The air/heat/defroster has stopped working. We have tried to replace the blower, and the control panel. BUt this is not making it work. What else could be the problem?
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Monday, December 31st, 2018 AT 12:18 PM (Merged)
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,700 POSTS
First, are you getting power to the blower motor that you replaced? Have you checked the blower motor relay and resister?

Let me know.

Joe
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Monday, December 31st, 2018 AT 12:18 PM (Merged)
Tiny
BKNOWS456
  • MEMBER
  • 1 POST
  • 1998 CHEVROLET ASTRO
  • 100,000 MILES
Blower works, but no heat. Any sig
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Monday, December 31st, 2018 AT 12:18 PM (Merged)
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
Coolant level, air in system, heater core blocked, thermostat and blend door.

Roy
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Monday, December 31st, 2018 AT 12:18 PM (Merged)
Tiny
BONITA66
  • MEMBER
  • 2 POSTS
  • 1993 CHEVROLET ASTRO
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 180,000 MILES
Just wondering what the best way to get to the heater core is on my van. There is some heat coming through but not enough to make it comfortable. I'm assuming that the core is either plugging off or there is some obstruction in the housing. Any advice is much appreciated.
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Monday, December 31st, 2018 AT 12:18 PM (Merged)
Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
Why don't you replace the thermostat for a start and see what happens. Also check if it has a heater control valve that controls heated coolant going thru the heater core-
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Monday, December 31st, 2018 AT 12:19 PM (Merged)
Tiny
BONITA66
  • MEMBER
  • 2 POSTS
I replaced the thermostat already and it made no difference. Is there a way to check the control valve?
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Monday, December 31st, 2018 AT 12:19 PM (Merged)
Tiny
BILL EEEEEEE
  • MEMBER
  • 1 POST
  • 1999 CHEVROLET ASTRO
  • 6 CYL
  • AWD
  • AUTOMATIC
  • 95,000 MILES
Heat wont work thrueout caR ONLY ONdefrost
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Monday, December 31st, 2018 AT 12:19 PM (Merged)
Tiny
JETSA
  • MEMBER
  • 117 POSTS
Vacuum leak most likely. Check the front of the engine area for a small black nylon tube that probably has 1 or more holes in it. Pretty common on Astro's.
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Monday, December 31st, 2018 AT 12:19 PM (Merged)
Tiny
DRAGONWOLF38
  • MEMBER
  • 1 POST
  • 1994 CHEVROLET ASTRO
Heater problem
1994 Chevy Astro 6 cyl All Wheel Drive Automatic

replaced the heater switch and heater worked for a few days and the quit? Sometimes if you slam the door hard enough it will start working. I am trying to find out what the problem could be. If it could be in the fuse box or if there is a different problem
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Monday, December 31st, 2018 AT 12:19 PM (Merged)
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,700 POSTS
Hi:
To check the switch, you will need to check for power in and out of the switch. Also, make sure all connections are clean and tight.

Let me know what you find.

Joe
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Monday, December 31st, 2018 AT 12:19 PM (Merged)
Tiny
BOOMER8637
  • MEMBER
  • 1 POST
  • 1996 CHEVROLET ASTRO
Heater problem
1996 Chevy Astro

the heater blows cold air no smell of antifreze new thermastat last year please help thank you
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Monday, December 31st, 2018 AT 12:19 PM (Merged)
Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
Check or replace thermostat again and also the heater core if its clogged-up if okay could be coming from behind the dash with doors/vacuum/actuators problems or the HVAC control module itself
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Monday, December 31st, 2018 AT 12:19 PM (Merged)
Tiny
SREMLAP5
  • MEMBER
  • 2 POSTS
  • 1999 CHEVROLET ASTRO
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 130,000 MILES
My Astro only blows cold air from the front. Rear heater works fine. The blower works as advertised, as does the selector (although I did replace a rotted section of vacuum tube across the intake a while back when it failed and I had defrost only). Coolant level is fine. Engine temp is normal.

Both hoses from the control valve to the front heater core remain cold. Would this be an indication of faulty control valve? Blocked heater core? Should I be looking at something else?

Any advice is greatly appreciated!
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Monday, December 31st, 2018 AT 12:19 PM (Merged)
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,700 POSTS
Hi:
If both hoses are cold, there is no circulation to the core. Check to see if there is a heater control valve on one of the heater core hoses. If not, you may want to try flushing the heater core.

Let me know if this helps.

Joe
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Monday, December 31st, 2018 AT 12:19 PM (Merged)

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