1993 chevy Silverado 4.3l xcab c1500 low heat problem - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Bob252 · 01-06-2018, 09:53 AM

My heater barely works but my temp is 195° the heater hoses seem to be at about the same temperature. No over heat problem present. Coolant level is good. But the heater just won't blow hot. This has been a problem for years but lately the temperature outside has hit record lows. Please help. 😩😩😩😩😩😩😩😩

b454rat · 01-06-2018, 11:25 AM

Heater core is prolly plugged. Pull lines off, blow air thru the return side of the core.

Bob252 · 01-06-2018, 01:11 PM

Did that. No change. Still only luke warm air coming out.

What mechanisms makes the cold air hot?

If there is a door that controls this. Where is it on a 1993 chevy truck?

b454rat · 01-06-2018, 04:24 PM

There is a door in there that controls air flow. Not sure how it works or where it is. Guess I've been lucky with the pre-95s that the heat works lol.

**mountie** · 01-06-2018, 07:07 PM

There is a door to allow heat to enter cab. located, sort of below / right side of radio. access by removing glove box..... to left of glove box opening....

Also ...maybe your heater core is covered with leaves & junk. The stuff that wiggles it's way down from the vent, at bottom of windshield.

( When I replaced my A/C, I found my heater core covered with crap )

( My '88 Sierra )

ninety6 · 01-06-2018, 10:04 PM

not really a lot to getting heat --- suggestions above will hopefully get you going. Its going to be either not enough hot coolant getting to/through the heater core (bad t-stat or clogged core or line), or the air going through the vents isn't going across the heater core due to a blend door issue, or as suggested, maybe even leaves!

diveplane · 01-15-2018, 11:35 PM

Quote:

Originally Posted by b454rat

There is a door in there that controls air flow. Not sure how it works or where it is. Guess I've been lucky with the pre-95s that the heat works lol.

called actuator flap controls all 3 modes in vent, sometimes the mechanism sticks ,some wd40 does the trick.

like someone mentioned heater core could be plugged up, or a hose but that in return would over heat your truck as well.

diveplane · 01-15-2018, 11:40 PM

my 94 this flap unit is drivers side under dash.

01-06-2018, 09:53 AM	#1
Bob252 Registered User Join Date: Mar 2017 Location: Jay Posts: 8	1993 chevy Silverado 4.3l xcab c1500 low heat problem My heater barely works but my temp is 195° the heater hoses seem to be at about the same temperature. No over heat problem present. Coolant level is good. But the heater just won't blow hot. This has been a problem for years but lately the temperature outside has hit record lows. Please help. 😩😩😩😩😩😩😩😩

01-06-2018, 11:25 AM	#2
b454rat Senior Member Join Date: May 2004 Location: Binghamton, NY Posts: 3,003	Re: 1993 chevy Silverado 4.3l xcab c1500 low heat problem Heater core is prolly plugged. Pull lines off, blow air thru the return side of the core.

01-06-2018, 01:11 PM	#3
Bob252 Registered User Join Date: Mar 2017 Location: Jay Posts: 8	Re: 1993 chevy Silverado 4.3l xcab c1500 low heat problem Did that. No change. Still only luke warm air coming out. What mechanisms makes the cold air hot? If there is a door that controls this. Where is it on a 1993 chevy truck?

01-06-2018, 04:24 PM	#4
b454rat Senior Member Join Date: May 2004 Location: Binghamton, NY Posts: 3,003	Re: 1993 chevy Silverado 4.3l xcab c1500 low heat problem There is a door in there that controls air flow. Not sure how it works or where it is. Guess I've been lucky with the pre-95s that the heat works lol.

01-06-2018, 07:07 PM	#5
mountie Senior Member Join Date: Jun 2011 Location: Bradenton, Fla. Posts: 1,017	Re: 1993 chevy Silverado 4.3l xcab c1500 low heat problem There is a door to allow heat to enter cab. located, sort of below / right side of radio. access by removing glove box..... to left of glove box opening.... Also ...maybe your heater core is covered with leaves & junk. The stuff that wiggles it's way down from the vent, at bottom of windshield. ( When I replaced my A/C, I found my heater core covered with crap ) ( My '88 Sierra ) __________________ '70 GTO Midnight Blue '88 GMC Sierra SLE 392,000 miles-(2018) sold to Classic car shop in Germany. '93 Cadillac STS Black '93 Mercedes SL 500 Teal '86 Yamaha FZ750 - 15,000 RPM '86 Yamaha FJ1200 - Criminally Fast 2016 Ferrari 488 GTB, I drive it - don't own it. '05 GMC Yukon XL , SLT 4wd ( just purchased 2018)

01-06-2018, 10:04 PM	#6
ninety6 Registered User Join Date: Feb 2016 Location: Mason, OH Posts: 85	Re: 1993 chevy Silverado 4.3l xcab c1500 low heat problem not really a lot to getting heat --- suggestions above will hopefully get you going. Its going to be either not enough hot coolant getting to/through the heater core (bad t-stat or clogged core or line), or the air going through the vents isn't going across the heater core due to a blend door issue, or as suggested, maybe even leaves!

01-15-2018, 11:40 PM	#8
diveplane Registered User Join Date: Nov 2016 Location: Tulsa Posts: 291	Re: 1993 chevy Silverado 4.3l xcab c1500 low heat problem my 94 this flap unit is drivers side under dash.

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