Question about 1993 Chevrolet S-10 Blazer

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Just had my heater core replaced and do not see much difference.

Personally I thing there is a blockage some where. I get some heat now but it doesn't blow out good.I do not feel that im getting the heat it should be putting out my mechanic said the fans fine could it be that the heat switch needs to be replaced?

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  • t_mollison Jan 02, 2009

    thank you ever so much for your respones i have to clairify one aspect when my friend found this web site and posted question at hand my blazer is a97 and not a93

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  1. has the thermostat been changed lately? because they stick open sometimes and you do not build up good engine temp. so not to good of heat then.

Posted on Jan 01, 2009

  • Kevin J.Hochstein Jan 02, 2009

    Yes that makes a big differents, but that being the case with that year. I think your buddy has the right answer.

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  • Chevrolet Master
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The 1st thing to do is make sure the cooling system is full, if not u can get an air bubble blocking coolant flow.

Posted on Dec 18, 2008

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66 chrgr
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SOURCE: just had my heater core replaced and do not see much difference.

the unit were you turn on the fan leaks vacuum which causes the vents not to blow properly the unit is not expensive for it is plastic comes with fan switch ex..

Posted on Feb 27, 2009

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2 Answers

Truck doesn't heat while idling


Could be low on antifreeze. The heater core is the highest spot in the cooling system and it may develop an air pocket. Another possibility is the thermostat is stuck partially open and doesn't let the engine warm correctly, watch your temp gauge on the dash and see if it comes up to the middle like it should while idling. If it doesn't, it may need replacement.

Oct 19, 2014 | 2001 Dodge Ram 1500 Truck 2WD

1 Answer

Heater doesn't work


Make sure the coolant level is full in the reservoir.

If the coolant level is good feel the hoses that go to the heater core back by the firewall. If one is cold and one is hot that the heater core is plugged. I have had fairly good success back flushing the heater cores and getting them to work. If back flushing does not work than the heater core will need to be replaced. The entire dash will need to be removed to do this.

If both the hoses are hot than it may be the blend door actuator. You should hear a distinct difference in the air flow from the vents by moving the heat control from full hot to full cold.

The last thing is the t-stat could be stuck open. If this where the case than the temp gauge will also be reading low.

Check those out and let me know what you find.

Feb 14, 2012 | 1999 Mercury Sable

1 Answer

I have a 1995 GMC Yukon, last weekend my blower motor cut out than back on and since than I have not been getting any heat. I fluched the heater core, replaced the lines to the heater sore, sut the lines...


if you have 20 degrees difference that is quite a bit of a difference.i would say that the heater core is plugging up,remember the fan blowing air across the core is cooling the temp more and with a 20 degree difference its alot.you can try to run CLR through it a couple of times to see if it will help flush out more dirt.sometimes flushing just doesn`t do it.

Apr 08, 2011 | GMC Yukon Cars & Trucks

4 Answers

Mitsubishi Space star heater only blows cold air .


Check your coolant level. If your coolant level is good then look at your heater core. With the engine running touch both heater hoses that go through the firewall in your engine compartment. Both should be hot to the touch. If only one is hot, you have a blockage somewhere. Worst case scenario you'll need a new heater core.

Jan 02, 2010 | 2006 Mitsubishi Colt

1 Answer

Heat not working on 98 gmc jimmy. Replaced thermostat, checked fluids. Blows air but no heat. Have automatic temp controls and when put on auto nothing at all comes through vents but if put back to manual...


Flushing the heater core is fairly easy just remove the 2 hoses going to the heater core and use a different hose if you have to and use a garden hose to backflush the blockage out..this may take as much as 5-6 times also check for vacumn lines missing or disconnected or breaks pinched ect... some where in the vicinity of the passenger side under hood by the a/c lines ect. good luck hope this helps

Dec 06, 2009 | 1998 GMC Jimmy

1 Answer

No heat is there a fuse 2003 f250 is there a fuse for heater


i don't know realy if there is a fuse (though i doubt it) but issues with heatting may be this will help.

If the carpet under the heater core is damp, or if antifreeze vapor or steam is coming through the vents, the heater core is leaking.
Remove it and install a new unit (most radiator shops will not repair a leaking heater core.
If the air coming out of the heater vents isn't hot, the problem could stem from any of the following causes:
  • The thermostat is stuck open, previnting the engine coolant from warming enough to carry heat to the heater core. Replace the thermostat.
  • There is a blockage in the system, Preventing the flow of coolant through heater core. Feel both heater hoses the firewall. They should be hot.if one of them is cold, there is an obstruction in one of the hoses or in the heater core,or the heater control valve is shut. Detach the hoses and back flush the heater core with a water hose. If the heater core is clear but circulation is impeded, remove the two hoses and flush them out with a water hose.
  • If flushing fails to remove the blockage from the heater core, the coremust replaced.

Nov 27, 2009 | 2003 Ford F250 Super Duty Crew Cab

1 Answer

Heater not working (no heat)


If u have issues with heatting may be this will help.

1- If the carpet under the heater core is damp, or if antifreeze vapor or steam is coming through the vents, the heater core is leaking.Remove it and install a new unit (most radiator shops will not repair a leaking heater core.

1 - If the air coming out of the heater vents isn't hot, the problem could stem from any of the following causes:
  • The thermostat is stuck open, previnting the engine coolant from warming enough to carry heat to the heater core. Replace the thermostat.
  • There is a blockage in the system, Preventing the flow of coolant through heater core. Feel both heater hoses the firewall. They should be hot.if one of them is cold, there is an obstruction in one of the hoses or in the heater core,or the heater control valve is shut. Detach the hoses and back flush the heater core with a water hose. If the heater core is clear but circulation is impeded, remove the two hoses and flush them out with a water hose.
  • If flushing fails to remove the blockage from the heater core, the coremust replaced.

Nov 19, 2009 | 2003 Ford F250 Super Duty Crew Cab

2 Answers

Car will only have sometimes and i have replaced


If the car is not providing heat and thermostat is good, then your problem is a faulty heater core. Sometimes when heat cores wear out, they sometimes give off an anti-freeze smell.
You can go to autozone.com and register for full free online repair manual with everything you could need for your car.

Nov 15, 2009 | 1996 Ford Explorer

1 Answer

Just had my heater core replaced and do not see much difference.


the unit were you turn on the fan leaks vacuum which causes the vents not to blow properly the unit is not expensive for it is plastic comes with fan switch ex..

Feb 24, 2009 | 1995 Chevrolet Blazer

1 Answer

The heat system is broken


Hi,

You haven't said what is actually wrong with the heat system (there can be several different failures). For the time being I'll assume the fan blows plenty of air but the air is always cool/cold regardless of where the heat temperature selector is positioned.

The most common cause on these cars is a plugged heater core. With the engine at normal operating temperature, feel the heater core hoses (under-hood, mid/lower portion of firewall, access from passengers side). They should both be very warm. If not expect blockage in the heater core.

While a replacement heater core along with a good cooling system flush is the ultimate cure, reverse flushing the heater core will restore heat. This can be accomplished with a garden hose. Disconnect both heater core hoses (not with the engine hot as the coolant get very hot!!) and connect a garden hose. Turn on the water supply to flush the core. Flush the core in both directions (by hooking the hose to one side of the heater core and letting the water run, then disconnecting and connecting to other side of the heater core...). An old garden hose with end cut will work fine if your existing hose will not fit over the pipe (plumb it together anyway you can).

The heater core sits rather low in the cooling system. This means crud in the system will settle there eventually causing blockage. If you flush the core the crud will eventually cause blockage again. Reflushing will work over and over again if saving money is the primary goal.

If this is not the problem, the blend air door is probably not working.

Reply and we'll continue. I don't want to repeat things that have already been done, as $2000 should of covered both things I have mentioned.

Nov 19, 2008 | 1999 Ford Taurus

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