2005 Chevy Suburban Coolant Issue - The 1947 - Present Chevrolet & GMC Truck Message Board Network

shultzee13 · 05-24-2019, 02:14 PM

I have a new to me 2005 chevy suburban LT 5.3L

I cant seem to keep dex cool in the reservoir. The top radiator hose is not hard. It is hot but not hard, easy to squeeze.

I do not see any visible leaks anywhere. I filled with dex cool last night and drove 30 miles to work and now coolant gone again.

I do not see any leaks or puddles anywhere. AC is ice cold.

Temp gauge runs straight up n down 12 o clock. It's never ran hot. The low coolant light has never came on.

I cannot speak for what the previous owner has done but I have owned it for 3 months now and runs great!

I guess I am noticing this issue now because it's getting hot outside in Texas.

Thanks guys for any suggestions.

**Palf70Step** · 05-24-2019, 02:55 PM

Check the oil and see if it is getting into there. Intake gaskets are know to leak on GM V8 and V6s after a bit of time.

shultzee13 · 05-24-2019, 03:35 PM

Nothing in the oil. All good there.

Just no pressure in top hose.

shultzee13 · 05-24-2019, 03:38 PM

Could a reservoir cap cause this? One where the oring has hardened?

406flyfish · 05-24-2019, 07:33 PM

The intake gasket doesn’t have coolant going thru it. You need to fill it up and pressure test it to find the leak. The most common leaks are the water pump and the plastic heater nipple fittings.
Good luck

**hatzie** · 05-24-2019, 08:32 PM

The 01-06 Suburbans with Castech cylinder heads lost coolant through cracks in the oil return wells.
TSB 06-06-01-019B
http://ww2.justanswer.com/uploads/Bl...t_loss_5.3.pdf

05-24-2019, 02:14 PM	#1
shultzee13 Registered User Join Date: Jan 2012 Location: Tyler Texas Posts: 223	2005 Chevy Suburban Coolant Issue I have a new to me 2005 chevy suburban LT 5.3L I cant seem to keep dex cool in the reservoir. The top radiator hose is not hard. It is hot but not hard, easy to squeeze. I do not see any visible leaks anywhere. I filled with dex cool last night and drove 30 miles to work and now coolant gone again. I do not see any leaks or puddles anywhere. AC is ice cold. Temp gauge runs straight up n down 12 o clock. It's never ran hot. The low coolant light has never came on. I cannot speak for what the previous owner has done but I have owned it for 3 months now and runs great! I guess I am noticing this issue now because it's getting hot outside in Texas. Thanks guys for any suggestions.

05-24-2019, 02:55 PM	#2
Palf70Step State of Confusion! Join Date: Jul 2002 Location: Gulfport, MS USA Posts: 47,249	Re: 2005 Chevy Suburban Coolant Issue Check the oil and see if it is getting into there. Intake gaskets are know to leak on GM V8 and V6s after a bit of time. __________________ Bill 1970 Chevy Custom/10 LWB Fleetside 2010 Toyota Tacoma PreRunner SR5 Double Cab - DD Member of Louisiana Classic Truck Club (LCTC) Bill's Gallery Life isn't tied with a bow, but it's still a gift. Live simply. Love generously. Care deeply. Speak kindly. Leave the rest to God!

05-24-2019, 03:35 PM	#3
shultzee13 Registered User Join Date: Jan 2012 Location: Tyler Texas Posts: 223	Re: 2005 Chevy Suburban Coolant Issue Nothing in the oil. All good there. Just no pressure in top hose.

05-24-2019, 03:38 PM	#4
shultzee13 Registered User Join Date: Jan 2012 Location: Tyler Texas Posts: 223	Re: 2005 Chevy Suburban Coolant Issue Could a reservoir cap cause this? One where the oring has hardened?

05-24-2019, 07:33 PM	#5
406flyfish Registered User Join Date: Jul 2017 Location: Montana Posts: 30	Re: 2005 Chevy Suburban Coolant Issue The intake gasket doesn’t have coolant going thru it. You need to fill it up and pressure test it to find the leak. The most common leaks are the water pump and the plastic heater nipple fittings. Good luck

05-24-2019, 08:32 PM	#6
hatzie Moderator Join Date: Oct 2008 Location: Wentworth, NH Posts: 4,977	Re: 2005 Chevy Suburban Coolant Issue The 01-06 Suburbans with Castech cylinder heads lost coolant through cracks in the oil return wells. TSB 06-06-01-019B http://ww2.justanswer.com/uploads/Bl...t_loss_5.3.pdf __________________ 1959 M35A2 LDT465-1D SOLD 1967 Dodge W200 B383, NP420/NP201 SOLD 1969 Dodge Polara 500 B383, A833 SOLD 1972 Ford F250 FE390, NP435/NP205 SOLD 1976 Chevy K20, 6.5L, NV4500/NP208 SOLD 1986 M1008 CUCV SOLD 2000 GMC C2500, TD6.5L, NV4500 2005 Chevy Silverado LS 2500HD 6.0L 4L80E/NP263 2009 Impala SS LS4 V8 RTFM... GM Parts Books, GM Schematics, GM service manuals, and GM training materials... 1973-1991 GM Light Truck Service, Unit/Overhaul, Wiring Manuals, Parts Books and Some 1968-1999 GM Service Training textbooks in PDF 1988-1998 GMT400 CK service manual project 1988-1993 GMT400 CK parts books. 1967-1972 GM Light, Medium, & Heavy Truck Service Manuals in PDF Please include at least the year and model in your threads. It'll be easier to answer your questions. And please let us know if and how your repairs were successful.



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