coolant problem - The 1947 - Present Chevrolet & GMC Truck Message Board Network

skeet85silverado · 04-21-2005, 09:07 AM

Has anyone out there had this problem. I have a 85 chevy truck with a 305 in it. I have a aftermarket temp gauge in it. I have a 190 themasatat in it and the temp gauge stays at 190 when the truck warms up all the way,but after i finish driving if i pop my hood both my upper and lower radiator hoses are sucked in like know coolant is getting to my block but my temp never goes above 190 why driving. Has anyone had this problem?

screwballl · 04-21-2005, 09:43 AM

sounds like time for new hoses and radiator cap... replace those then let us know if it is still over-pressurizing.. had a similar problem on a 79

86-C10-V6 · 04-21-2005, 02:10 PM

The cap should have a one way valve that allows fluid from the overflow to enter the radiator as the fluid cools and condenses. Sounds like the cap is broken.

piecesparts · 04-21-2005, 05:26 PM

I agree with the fact that new hoses and cap may be needed, BUT I would also look at what your coolant level is. The fact that the hoses are sucking in , relates to the fact that your radiator is NOT completely filled. When I fill my truck I work as much of the air out that I can and then I run it for awhile and then work the rest out. the hose is sucking in, because the system is not full and a vacuum is being drawn on the system, which causes the hoses to collapse.

screwballl · 04-21-2005, 08:37 PM

i was actually gonna reply with same info piecesparts just said... make sure it is full and if it has an overflow resivoir, fill that to cold level at least

white82 · 04-21-2005, 09:51 PM

the bottom hose should have a spring in it to keep it from sucking together if it is sucking together then the hose is bad

raceman6135 · 04-22-2005, 01:02 AM

I agree with replacing both radiator hoses and the radiator cap.

Even if the hoses weren't bad before and it was just the rad cap, once those hoses have been strained like yours have, spend the $20 to get new hoses. One less thing to worry about.

Perhaps throw in another $2 for four new stainless steel hose clamps, too.

DJS

skeet85silverado · 04-22-2005, 08:20 AM

Thanks guys. By the way my overflow tank has no cap on it it broke off. Do i really need a cap on it?

Nolowrider · 04-22-2005, 08:49 AM

Make sure the rad is completely full, make sure the cap is on right. Some caps have an arrow or a dot that has to be aligned with the overflow line. Make sure you have fluid in the overflow tank and the hose is down in the fluid. The rad will either suck fluid out of the tank or overflow into it as needed. I don't think the cap matters, but would be a good idea to put one on.

04-21-2005, 09:07 AM	#1
skeet85silverado Registered User Join Date: May 2004 Location: warner robins ga Posts: 158	coolant problem Has anyone out there had this problem. I have a 85 chevy truck with a 305 in it. I have a aftermarket temp gauge in it. I have a 190 themasatat in it and the temp gauge stays at 190 when the truck warms up all the way,but after i finish driving if i pop my hood both my upper and lower radiator hoses are sucked in like know coolant is getting to my block but my temp never goes above 190 why driving. Has anyone had this problem?

04-21-2005, 09:43 AM	#2
screwballl Tonawanda 454 Join Date: Mar 2004 Location: Liquid Sunshine State Posts: 2,755	sounds like time for new hoses and radiator cap... replace those then let us know if it is still over-pressurizing.. had a similar problem on a 79 __________________ 91 Chevy Suburban Tonawanda 454 R2500 - SOLD!!! 04 Dodge Durango 5.7L Hemi 2WD, 24K miles (as of July 2011) In the past 30 years about 90% of Fords are still on the road, the other 10% made it home. -------------------

04-21-2005, 02:10 PM	#3
86-C10-V6 Shadetree Mechanic Join Date: Oct 2002 Location: Youngsville, NC Posts: 100	Sounds like a radiator cap The cap should have a one way valve that allows fluid from the overflow to enter the radiator as the fluid cools and condenses. Sounds like the cap is broken. __________________ Dave M. (Hacksaw) 86 C10 Scottsdale LWB, 4.3L, Edelbrock 1904, K&N, 700R4, 3.08 Auburn Performance 89 GMC S-15 Extended Cab 4x4, 4.3L, FI 98 K1500 Xcab, 5.7L, 3.43 Gov-Lok

04-21-2005, 08:37 PM	#5
screwballl Tonawanda 454 Join Date: Mar 2004 Location: Liquid Sunshine State Posts: 2,755	i was actually gonna reply with same info piecesparts just said... make sure it is full and if it has an overflow resivoir, fill that to cold level at least __________________ 91 Chevy Suburban Tonawanda 454 R2500 - SOLD!!! 04 Dodge Durango 5.7L Hemi 2WD, 24K miles (as of July 2011) In the past 30 years about 90% of Fords are still on the road, the other 10% made it home. -------------------

04-21-2005, 09:51 PM	#6
white82 White 82 Join Date: Feb 2004 Location: Eustace, Texas Posts: 100	the bottom hose should have a spring in it to keep it from sucking together if it is sucking together then the hose is bad __________________ 1966 GTO 455 e-heads, 1982 Chevy k10 4'' lift 33’' tires, 2008 Pontiac g6 v6

04-21-2005, 05:26 PM	#4
piecesparts Parts and more parts Join Date: Nov 2003 Location: Lebo, Kansas (middle of nowhere Posts: 6,821	I agree with the fact that new hoses and cap may be needed, BUT I would also look at what your coolant level is. The fact that the hoses are sucking in , relates to the fact that your radiator is NOT completely filled. When I fill my truck I work as much of the air out that I can and then I run it for awhile and then work the rest out. the hose is sucking in, because the system is not full and a vacuum is being drawn on the system, which causes the hoses to collapse.

04-22-2005, 01:02 AM	#7
raceman6135 Dino burner Join Date: Nov 2002 Location: Calgary, Alberta, Canada Posts: 602	I agree with replacing both radiator hoses and the radiator cap. Even if the hoses weren't bad before and it was just the rad cap, once those hoses have been strained like yours have, spend the $20 to get new hoses. One less thing to worry about. Perhaps throw in another $2 for four new stainless steel hose clamps, too. DJS

04-22-2005, 08:20 AM	#8
skeet85silverado Registered User Join Date: May 2004 Location: warner robins ga Posts: 158	Thanks guys. By the way my overflow tank has no cap on it it broke off. Do i really need a cap on it?

04-22-2005, 08:49 AM	#9
Nolowrider Senior Member Join Date: Jan 2005 Location: New Orleans Posts: 1,365	Make sure the rad is completely full, make sure the cap is on right. Some caps have an arrow or a dot that has to be aligned with the overflow line. Make sure you have fluid in the overflow tank and the hose is down in the fluid. The rad will either suck fluid out of the tank or overflow into it as needed. I don't think the cap matters, but would be a good idea to put one on.



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