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Heater blows cold

Heater blows cold

Postby WishinItWasAZ71 [OP] » Oct 24 2013, 4:15am

So I have a 2001 silverado. To start off, my ac blows super cold and all the electronics work fine. My problem is that my heater blows cold/barely warm on any setting. I replaced the radiator due to a leak. Since it was summer time and I had jus bought the truck I dont remember the heater workin or not before the replacement of the radiator.

The heater will blow somewhat hot air only when the engine is around 200 and the setting is off but set to heat.

My coolant is full also.

Hope I explained it good enough. Thanks for any help on what the problem could be.
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Re: Heater blows cold

Postby gmcultr » Oct 24 2013, 5:43am

My truck did this too after I swapped radiators... but mine won't barely reach 180 degrees.... I put a larger radiator to install oem style electric fans... :/

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Re: Heater blows cold

Postby SilverSurfer » Oct 24 2013, 9:15am

Since you feel some heat coming out I would suspect the blend door motor is the problem. Do you feel any difference whether you have it on hot or cold?
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Re: Heater blows cold

Postby filstoy » Oct 24 2013, 11:21am

You said all the electronics work fine but are you sure it's not the temperature actuator ? Fairly common problem on these trucks. Here's a video about it.
http://www.youtube.com/watch?v=_Suo7gNvLTM
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Re: Heater blows cold

Postby poncho62 » Oct 24 2013, 11:42am

Simplest thing to try is feel the hoses going into the heater core, If one is hot and the other cold, the heater core is plugged, If so, flush out the heater core....it may just be plugged.
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Re: Heater blows cold

Postby gmcultr » Oct 24 2013, 12:16pm

On my truck im pretty sure the temperature isnt getting high enough because at idle it works great and my temp builds to 200-210... going down the road though my temp is around 175-180 usually on the lower side... ive replaced my tstat like 10 times trying to correct this

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Re: Heater blows cold

Postby WishinItWasAZ71 [OP] » Oct 24 2013, 12:31pm

SilverSurfer wrote:Since you feel some heat coming out I would suspect the blend door motor is the problem. Do you feel any difference whether you have it on hot or cold?

This mornin it took until 200 to feel any heat fron the heater. It blew fairly warm for a few seconds then turned to cold.
When I have the setting on cold, its cold. When its on hot, its hot until I turn the blower on.
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Re: Heater blows cold

Postby red16 » Oct 24 2013, 2:41pm

As a previous poster said,feel the hoses coming from the heater core,under the hood.They should be the same temp.If not,you may have an air lock in the heater core.Make sure the coolant level is at the proper level,and not a little low.
I had this problem with my truck,and have seen it on others,after work on the coolant system.The heater core is at the highest point in the system,and is easily air locked.
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Re: Heater blows cold

Postby SilverSurfer » Oct 25 2013, 3:41am

gmcultr wrote:On my truck im pretty sure the temperature isnt getting high enough because at idle it works great and my temp builds to 200-210... going down the road though my temp is around 175-180 usually on the lower side... ive replaced my tstat like 10 times trying to correct this

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What temp t-stat are you using?
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Re: Heater blows cold

Postby gmcultr » Oct 25 2013, 1:55pm

186degree oem... tried several 186 stants... ive literally changed it 7 times last winter.

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