Question about 1994 GMC Sonoma
Just put in a new thermostat, there seems to be little or no flow in rad with cap off
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Posted on Jan 02, 2017
Cap cannot come off unless it was left loose. (most are a bit difficult even when removing on purpose) Refill with 50/50 mix right into the radiator while running, then re-fill bottle after closing cap. As always, don't open cap when radiator is hot.
Posted on Jul 11, 2009
The radiator might be clogged. Take it and have the system flushed out,and back flushed, that will tell if there is a clog somewhere. If the radiator is too clogged, it will need to be replaced.
Posted on Mar 28, 2010
i had a 95 blazer with ice cold heater i just backed flushed the heater core and it work like new, all you gotta do is find the 2 hoses going to the firewall and disconnect them from the motor and using a garden hose run water through 1 and see if you get some crud out of it.
Posted on Dec 15, 2010
SOURCE: Loosing small amount of coolant
Check your manifold(upper plenum) area. A leak in the gaskets is common in GM cars.
heater fittings where leaking bad in my 2000 impala and now I have to replace those gaskets.
The best recommendation I can give you if you wanna save money is get a Tech like myself not working for a company who rewards them for selling parts, and they should be able to find the direct leak(s) and not just guess.
I would start with a simple coolant leak detecting dye Kit.
Posted on Dec 16, 2010
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