Question about 1999 GMC Safari

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My van does not give out any heat , I have replaced the thermostat and have checked the heater core and it is clear , Switches seem to work properly ! is there a valve of some sort between the motor and the heater core ?

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The walve is betven the radiator end the incoming pipes

Posted on Nov 15, 2010

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2001 Ford F250, have no heat, blows only cold air. Have changed heater core, thermostat is working properly. Have checked and tried everything it seems and still no heat.

Hi Shannon, IM AL the owner of Big As Auto Repair.

Shannon, it looks like you have ruled out the coolant side not heating properly with the thermostat replacement and coolant flow through the heater core because you replace it as well. Let's first make sure coolant is getting to the heater core. Here's an easy way to check this issue. Start the engine and drive it until completely warm then park and leave the engine running, open the hood and check each heater hose that is connected to the heater core at the firewall. If both hoses are equally hot then the coolant is getting to the core and working properly. If one is a lot cooler then the other then you could have a heater valve on the system "OR" a water pump flow issue. BUT, if they are equally hot, then you most like have a heater door issue inside a/c housing. If the heater door is not working properly and staying on the cold side you will not have heat. Lets stay in close contact buy you going to my auto-repair-website and work together. Just click on "CONTACT US" and I'll work with you until we resolve this issue.

Nov 27, 2016 | Ford Cars & Trucks

1 Answer


First off check your Coolant level. If it is low, you will not get any, or you may get a little heat. If the Coolant level is good, you will need to check, or have someone check to see if you Thermostat is stuck open. If Thermostat is working properly, then your heater core must me suspected of being blocked . Have someone back flush the cooling system with a chemical flushing additive. If this gets you some heat, but not as good as it should be, replace the heater core. Hope this helps.

Oct 20, 2013 | 2006 Chrysler Town and Country

1 Answer

Heat problems in 92 chevy van

If the heater valve operate properly then the line to the heater core is plug.
Check & replace or flush.

Good luck


Jun 28, 2017 | Cars & Trucks

1 Answer

I have no heat in my 2001 tracker. The thermostat is brand new and the switches and controls on the inside are funtioning properly.

Is your blower working properly?Is it blowing out the vents,good,Is the blend door open for heat.Click here to see how to adjust.If it's the heater core,brrr,then click here to see how to replace.

Jan 06, 2013 | 2001 Chevrolet Tracker

1 Answer

My heater in my 2003 dodge caravan does not work properly

More than likely you have a clogged and possibly leaking heater core in your van. The heater core is located in the cabin behind the dash and it runs off of the antifreeze after it has run through the engine. You will need to remove and replace it with a new one, the flush your cooling system and top it off with new fresh fluid. How to Replace the Heater Core on 2003 Dodge Caravan eHow

Jun 10, 2017 | Cars & Trucks

3 Answers

My cadillac is not giving me any hot air ,ive replaced the radiator, changed the thermostat, has a new water pump, where do istart to look.

Feel the 2 tubes at the firewall for the heater core. If they are not getting hot, the heater core needs to be flushed out or replaced. I had this problem with a 1990 Cadilac Deville, it was just a plugged up heater core.

Remember to install sealant after flushing out the system to prevent leaks.

Jan 25, 2011 | 1992 Cadillac DeVille

1 Answer

I cant get much heat in my 2000 chevy venture

check if your thermostate is working... is it having troubles getting to operating tempurature?
check your heater lines that run to the heater core and see if there is heat getting to and from the heater core if the thermostat is running properly...
if you have heat running to and from the heater core then check and make sure your heater controls in the van are switching between defrost and heat and floor properly
could be a heater box problem ....
when i had the same problem with my venture it turned out to be a plugged heater core and i replaced it

Dec 07, 2010 | 2001 Chevrolet Venture

2 Answers

98 sable -no heat. changed thermostat, new recovery tank, radiator flushed. heater core clear . if i run engine at 2500 rpm ,will give some heat

Since your blower is working and it is a heat issue,thats where we'll start,First thing is have you checked the coolant level in the radiator when engine is cold,make sure it is filled to top,next verify you have coolant in reserve ,Start your van and get it up to normal operation temperature,If your heat gauge on the dash works correctly it should be 190 degrees,Now lift the hood and locate the two heater hoses going into the heater assembly at the fire wall,Both hoses should be hot to hold on to,if both are hot and no heat inside your problem will be the blend air door in heater assembly.
if neither hose is that hot you need to replace the thermostat in the engine to get it up to 195 degrees.
if one hose is hot and one is luke warm then the heater core is blocked and to blame. hope this helps you.

Dec 29, 2009 | 1998 Mercury Sable

1 Answer

No heat in 97 mercury villager

your heater core may be getting blocked up, or the thermostat may be stuck open at times. you have a few options here, option 1 and 2 cost about the same, option 1: have the thermostat replaced just so you know its working properly, a 97 will most likely not have a telltale way of knowing if the thermostat is bad or going bad. option 2. have the cooling system flushed at a shop. this will try to clear out and debris in the cooling system that may be blocking passages or the heater core. option 3 is the most expensive. have the heater core replaced, the heater core is what provides heat to the hvac system in the dash. a few other things to check would be vacuum lines/actuator/temperature door on your hvac system.

Feb 16, 2009 | 1997 Mercury Villager

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