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#1 |
Registered User
Join Date: May 2011
Location: Austin, TX
Posts: 32
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Coolant in heater/AC question
So I tore down my ventilation system today and there was probably 16 oz of coolant that came out of the vents, not the hoses. Is this a lot?
As far as I know the ventilation hasn't been changed or cleaned in 40 years. The heat/air hasn't worked since I bought the truck about a year ago. I did change the coolant and replace the thermostat shortly after I bought it. Thoughts? Also, how difficult is it to switch to R134a from R12?
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1973 C10 350 700R4 |
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#2 |
Registered User
Join Date: Aug 2009
Location: S.C.
Posts: 1,593
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Re: Coolant in heater/AC question
Yes, my old '73 (heat only) had none until the heater core blew. My '86 is also dry.
Converting I don't know, but when I attempt to repair the system on the '86, I'll have to do the same, so I'll be watching.
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'86 C-30 dually, 454/tbh400 '73 K-20 350/350/205 (sold ![]() I'm kinda like duct tape- no real purpose, but handy to have around. |
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#3 |
Registered User
Join Date: May 2011
Location: Austin, TX
Posts: 32
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Re: Coolant in heater/AC question
So possibly the heater core?
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1973 C10 350 700R4 |
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#4 |
Registered User
Join Date: Aug 2009
Location: S.C.
Posts: 1,593
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Re: Coolant in heater/AC question
Yes, I'm not sure though if water can leak in anywhere else. Can you smell coolant? Does the AC work now?
I don't want to tell you to change the heater core if it's possibly condensation from the AC. But it will give you something to keep an eye on. I haven't shopped for one lately, but I think a new HC is 25-30 bucks.
__________________
'86 C-30 dually, 454/tbh400 '73 K-20 350/350/205 (sold ![]() I'm kinda like duct tape- no real purpose, but handy to have around. |
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#5 |
Registered User
Join Date: May 2011
Location: Austin, TX
Posts: 32
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Re: Coolant in heater/AC question
It was the coolant/H2O mixture from the radiator. A/C does not work.
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1973 C10 350 700R4 |
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#6 |
Registered User
Join Date: Aug 2011
Location: Winnsboro TX
Posts: 234
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Re: Coolant in heater/AC question
I'm wondering how water's going to get in the vents, especially that much, with a good leak somewhere. Do you notice you have to add coolant very often?
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1st - '68 long bed 2nd - '81 SWB Now - '86 SWB, Edelbrock 1406/stock 350/700r4 |
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#7 |
78K & 79C Jimmys
Join Date: Nov 2009
Location: Ottawa Ont CANADA
Posts: 7,901
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Re: Coolant in heater/AC question
that seems a lot ,for somewhere it shouldn't be
heater core should be only thing in there with coolant maybe the core connection is spraying back into the houseing?
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John 1978 GMCJimmy4X4-350/203 1979 GMCJimmy4X2-305/350 |
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