Question about 1993 GMC Sierra K1500

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No heat. Changed the climate control in dash. Can hear the baffle cycle, but still no heat. No leaks in coolant system

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Are both heater hoses getting hot. Have you tried backflushing the heater core?

Posted on Nov 04, 2010

Testimonial: "Hose from intake is hot, return to radiator is not. Will try the flush this weekend. Thanks"

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Related Questions:

1 Answer

Climate control module has been replaced twice. Works correctly for several days and then blows heat only


Do you hear the compressor cycling on/ off regularly? Every couple of minutes. If not and it is cycling on/off every few seconds,I would suspect the system is low on freon. If it was serviced recently then I would suspect a leak in the system that relates to the lack of freon.
If just low on freon, shops have cans with gauges that can be purchased to top off the amount of freon in the system. Otherwise you'll need to find the leak.

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The heat does does not work in my 98 Tahoe at all its blows cold all the time I have done changed the there and put new coolent in it still have no heat so I by pasted the heat valve and ran it right in...


If you are getting hot water/coolant to the heater core and still no hot air coming out the vents, then it's a issue with the climate control or blend door. After running your engine and it reaching normal operating temp, locate your heater hoses that goes to the heater core. Carefully touch them to make sure both hoses are hot to the touch, if they are, you are getting hot water/coolant to and from the heater core. So, then it will have to be a issue with the climate control in the dash or either the blend door in the air box. It's a common problem for the climate control to go out on these models, hope this helps.

Nov 26, 2013 | Cars & Trucks

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I'm BAFFLED with a heater issue. Heat went off in my 1991 CRX SI with no apparent reason. Car is not overheating. Coolant in tank is full and it's clean. Top radiator hose is hot; bottom hose


Check the PUMP, there is apump that pumps the coolant from the radiator into the engine, if its broken you will have that problem.

Dec 29, 2012 | 1991 Honda CRX

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2003 Saab 9-5 2.3 leaks coolant (from engine cooling system-it's coolant/anitfreeze/water mix, not evap water, when ac on


Is it leaking inside the car? If so then it is more than likely the heater core is leaking antifreeze. You will need to replace the heater core under the dash.

May 12, 2017 | Saab 9 5 Cars & Trucks

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2003 Saab 9-5 2.3 leaks coolant when Climate Control on lower settings


Pressurize the cooling system to locate and repair the leak.

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Replaced a thermostat because i was getting no heat...still nit getting any heat and i replaced the heater core last year....what else should i look for


check to see if the hoses going to the heater are getting hot-you probably have a valve that is controlled by a vacuum hose and it may not be connected or is malfunctioning. It would be under the hood somewhere and inline with the hoses that allow coolant to go to and leave the heater core. The only other possibility is the blend door in the heater plenium is for whatever reason not hooked up properly. Check if you can hear a hissing under the dash-you may have a vacuum leak to a hose that goes to your climate controller.

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1999 Lincoln Navigator Heating Problem


if the heater core is getting hot then the problem is the air temp control blend door actuator, a common problem.

Mar 13, 2009 | 1999 Lincoln Navigator

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I have a 1994 Sunbird V6 that is Leaking Coolant from an Elbow coming out from the Firewall. How do I stop this?


Aside from disconnecting your heater hoses, the only fix is to replace the "heater core". The "heat" function of your climate control system relies on heated engine coolant to work. The small elbow that you describe, is most likely the condensate drain. The "heater core" and the "evaporator core(for the a/c)", are located beneath the dash assembly in an enclosed housing. The "heater core" should be serviceable without removing the complete housing as with some vehicles. I hope this helps

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1 Answer

1996 Ford Windstar-heater problems


chck te baffle in yor heater it could be stuck open

Nov 24, 2008 | 1996 Ford Windstar

1 Answer

Climate Control System Problem


The noise is most likely coming from a sticky temperature control blend door, ( they warp from heat, not an un-common issue) it is moved with a electric actuator. This is very expensive to fix, requires removal of the dash to repair, if the system works ok then if it was me I would "live with it".

Jul 16, 2008 | 2001 Cadillac DeVille

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