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Chevy Suburban

Tiny
WAYNE CURTIS
  • MEMBER
  • 1993 CHEVROLET SUBURBAN
  • V8
  • 2WD
  • AUTOMATIC
  • 222,222 MILES
I have a 93 chevy suburban that is not giving heat. It blows good but no heat. No heat in rear either. I have checked coolant level and replaced thermostat. Now what, any Help out there?
Saturday, December 18th, 2010 AT 10:55 PM

11 Replies

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,700 POSTS
Are both heater core hoses getting hot when the engine is hot and the heater is on?
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Wednesday, December 22nd, 2010 AT 5:19 PM
Tiny
WAYNE CURTIS
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  • 6 POSTS
The drivers side hose is really hot but the Passengers side hose is luke warm.
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Wednesday, December 22nd, 2010 AT 7:33 PM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,700 POSTS
Try flushing the heater core. It sounds like there isn't enough flow.
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Thursday, December 23rd, 2010 AT 12:39 PM
Tiny
WAYNE CURTIS
  • MEMBER
  • 6 POSTS
I flushed it forward and backward. Then I drove it and we had the best heat that we have had in years. Excellent, thank you so much. We are taking the suburban with my family of 6 and my in-laws for a drive to see the Christmas lights tomorrow. Timing was perfect. Merry Christmas and Happy New Year. May God bless you greatly and remember that Jesus is the reason for the season. Any idea why the rear unit does not give heat?
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Thursday, December 23rd, 2010 AT 8:24 PM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,700 POSTS
Great! I'm glad it worked. As far as the rear, are you getting any heat at all?

Merry Christmas to you too.

Joe
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Sunday, December 26th, 2010 AT 5:36 AM
Tiny
WAYNE CURTIS
  • MEMBER
  • 6 POSTS
No real heat. It feels very tepid.
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Monday, December 27th, 2010 AT 4:16 PM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
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I need you to check something for me. I can't remember on the 93 if it has seperate heater core hoses to the rear (under vehicle) or if they used one heater core for both areas. If it has the seperate heater core in the rear, chances are the same issue. Let me know.
Joe
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Monday, December 27th, 2010 AT 8:49 PM
Tiny
WAYNE CURTIS
  • MEMBER
  • 6 POSTS
Yes, I see 2 hoses going to the back. I will try to flush the rear heater core as well. Thanks! I will let you know how it comes out.
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Monday, December 27th, 2010 AT 10:29 PM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
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Check for any blockages in the lines when you are doing it. They rust over time (inside) and can cause a problem. Do the same thing you did to the front. I'll keep my fingers crossed.
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Tuesday, December 28th, 2010 AT 2:23 AM
Tiny
WAYNE CURTIS
  • MEMBER
  • 6 POSTS
When I went to flush the rear heater core, I could not get the hoses off. They have some kind of special clamp. It was a white plastic clamp that looked like if you could squeeze it, it would come off. I tried to no avail. Is there a special way to take the hoses off with this kind of clamp?
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Thursday, December 30th, 2010 AT 2:31 PM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,700 POSTS
I would need to see it. Is it possible to upload a picture for me?
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Thursday, December 30th, 2010 AT 8:52 PM

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