Heater problems...

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Heater problems...

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Blazer >> Mechanical & Maintenance >> General Tech Help >> 2nd Gen (1995-2005) Tech >> Heater problems...

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Heater problems... - 9/14/2004 12:08:17 PM

Maulsmasher

Posts: 1
Joined: 9/14/2004
Status: offline

I have a 1999 Blazer. The blower works...the A/C works, but the heater does not blow out hot air. I change the thermostate and now I don't know what else to do...anyone know what I should be checking?

Thanks

Post #: 1

RE: Heater problems... - 9/15/2004 2:14:22 AM

01xtreme

Posts: 420
Joined: 8/15/2004
From: United States
Status: offline

could be the heater coil....?

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Post #: 2

RE: Heater problems... - 12/19/2004 2:32:10 AM

dawne fischer

Posts: 2
Joined: 12/19/2004
Status: offline

did you find anything out about the heater problem. we have a 1996 4.3 chevy blazer, and it has the same problem. please reply

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Post #: 3

RE: Heater problems... - 12/20/2004 5:57:44 PM

zero psi

Site Moderator
Posts: 1075
Joined: 8/22/2004
From: maynard, MA
Status: offline

may be an air pocket in the radiator or block?

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Post #: 4

RE: Heater problems... - 12/20/2004 10:30:22 PM

jimmy91444

Posts: 14
Joined: 12/20/2004
From: Victoria B.C.
Status: offline

Probably the same probleme I had:

When your engine is warmed up doe's both heater hose get equaly hot? I had the same prob when i bought mine , and the hose from the engine to the heater core was somewhat hot but the one going to the radiator was almost cold.After replacing many parts like you did , I found out that the hole on the engine were the hose connect was almost block with residu. Leaving just a small amount of hot water going to the heater core. After cleaning out the hole i had all kind of heat ..... I ve got the 4.3 lt and the hose has a quick disconect to the engine it sit to te back of engine on pass side . Might be a bit different on yours, hope this help.

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Post #: 5

RE: Heater problems... - 2/26/2005 7:18:09 PM

astro

Posts: 2
Joined: 2/26/2005
Status: offline

I sure hope you got it fixed by now but if not, spend the money and get a full cooling system flush and refill done by a good mechanic. You probibly have restrictions in the system somewhere and need to clean them out.

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Post #: 6

RE: Heater problems... - 6/25/2005 6:50:18 PM

aspenpup

Posts: 29
Joined: 6/25/2005
Status: offline

Answering a bit late but for those who find this later...

I had exact same problem. I ended up removing both hoses going in/out of heater core (inside engine compartment). Using compressed air, I blew out the core. There was a big 'glob' of stuff in there that prevented water flow. Now, the heater works great!

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Post #: 7

RE: Heater problems... - 7/5/2005 12:35:56 AM

BLAZIN

Posts: 9
Joined: 3/4/2005
Status: offline

My a/c and heat don't blow at all, sometimes when i drive it might turn on, but then shuts off after a few mins. Any suggestions or ideas?

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Post #: 8

RE: Heater problems... - 7/7/2005 2:20:15 AM

dieselfumes

Posts: 36
Joined: 6/17/2005
Status: offline

might be electrical, or just the a/c clutch goin out.

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Post #: 9

RE: Heater problems... - 8/14/2005 5:14:43 PM

Swblazer

Posts: 17
Joined: 12/21/2004
From: Sweden
Status: offline

I had the same problem on my 99 Blazer LT....with electronic A/C

It was a bad solder on the bord in the motor that controlls the blending(airmixing) door for hot/cold air.

I took the motorassembly apart and solder all the connectionpoints and after that it worked again.
But it is very important to have the right position on the turn resistor inside the motor assembly.

Regards,
/Sverker from Sweden

(in reply to dieselfumes)

Post #: 10

RE: Heater problems... - 10/19/2005 8:19:48 PM

chessielex

Posts: 1
Joined: 10/10/2005
Status: offline

Thank you all for your input on the heater problems. I went looking for the answer to my heater problems on my 2001 blazer and found this site and my husband performed the task of blowing out the heater hoses and it worked. Save us a lot of money. Thank you once again.

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Post #: 11

RE: Heater problems... - 10/20/2005 4:35:52 PM

stmanser

Posts: 23
Joined: 10/10/2005
Status: offline

the only prob with getting a flush is it could break loose the deposits that have blocked off a hole or a small leak... i got a flush done on a grand am once and it blew the heater core out...

just fyi...

be careful with flushing a neglected system..

(in reply to chessielex)

Post #: 12

RE: Heater problems... - 10/29/2005 12:44:30 PM

gatopescado

Posts: 6
Joined: 10/29/2005
Status: offline

I just joined the forum. I'm having the same problem, no hot air blowing. I'm glad I joined as I might can fix this myself. Thanks to all who replied earlier.

(in reply to stmanser)

Post #: 13

RE: Heater problems... - 11/20/2005 9:44:56 PM

greenblazer72

Posts: 1
Joined: 11/20/2005
Status: offline

I have had that problem with my 97 for me it was a combo, my water pump was going out not putting out enough flow and my heater core was plugged, but do check the upper and lower radiator hoses for cold and hot , lower hose cooler.

(in reply to Maulsmasher)

Post #: 14