Join Date: Jan 2012
Location: Coralville, IA
Clapps1775 is offline
Re: coolant won't drain back into radiator from reservoir
I am having the same problem right now. 2003 4.3 zr2. 120k. I replaced the water pump last year and have the e fan on. I noticed today when I started my truck, I had the gurgeling sound on my dash. Checked coolant level and its low where my reservoir is full. Drove 30 miles today to half price books. Recheck and reservoir is still full and cool. I opened the cap enough and it pushed air into the reservoir. I should replace my cap. Also, replaced my radiator last year and I did a flush on it before I installed it. I need to flush my system again. Has brown junk again. Thinking cap is failing. I do not see or smell coolant. I will inspect my reservoir hoses and see if they are clogged.
1994 Chevy S10 2.2 Auto 4X2 LS. Sold.
1995 Chevy S10 4.3W Auto CPI 4X4 LS. Traded off.
2003 Chevy S10 4.3X Auto 4X4 ZR2 LS current.