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Re: need help to change thermostat in 1998 Chevy 2500...
The rad cap is on the top of the radiator on the passenger side,as for the thermostat....locate the upper rad hose(comes out of the top of the rad aprox 3" wide) it should be on the driver side of the rad. Follow the upper rad hose from the rad to the engine,the housing for the thermostat is at the end of the hose. 1:drain the radiator(there is a drain **** at the bottom of the radiator protrudes from rad looks similar to a wing nut) 2:Remove the two bolts in the thermostat housing(there may be some nuts holding some ground wires there that you have to remove before you can remove the thermostat housing bolts) 3:remove the housing ...........note: make note of the position of the thermostat before removal. 4:clean gasket surfaces install new gasket \ silicone (automotive grade silicone can be used with or without gasket) 5:insert new thermostat in the proper position. 6:replace housing and hose and top up the rad hope this helps.......Thanks for choosing FIX YA!
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either you have a bad thermostat or you have a air lock in your heater hoses remember your heater is fed by the hose by the upper rad hose return is the hose going to the water pump, to bleed the air out fill rad leave the rad cap off start engine run for 5 min. the check the coolant level,fill to top of neck replace rad cap tight, K-D tools make a special funnel to solve this air lock problem
Is the rad full? Sounds like your cooling system isn't full or has an air lock. Remove the cap and check. Top it up if it's not and leave the cap loose on the first catch. Leave it like this for a day or two and keep the heater on full while you drive the truck. Check and top up the rad as necessary. This will likely get your heat back.
there should be no air in the cooling system and the system can be bled by using a pressurising equipment . Ensure that the thermostat is placed in the motor the right way with the body facing the hot water (head or block). Air defeats the purpose of having a pressurised cap and system.
I'd start with replacing thermostat (that's the most common fault) Other possibilities; waterpump,leaky hose, radiator cap (not holding pressure), fan belt broken. I'd inspect for belt & leaks - if good replace thermostat.
Your rad may be blocking up. Make sure the flow of antifreeze is adequate through the rad. Check for loose fins & debris in front of the rad also. Remove the rad cap when cold & allow to heat up to operating temperature. Observe the flow when the thermostat opens. Check the serpentine belt for wear & replace if needed. If the flow is inadequate, replace the rad. Good luck!
Take rad cap off when cool & run it for a while with the heater on (not defrost) and top up coolant as needed in rad, about an inch or 2 from top of rad. Let it run until you see rad fan come on & off about 2 or 3 times at operating temperature. Then replace cap, top up return bottle to proper level, and try that. Probably still air in system. If that doesn't cure it, I'd look at faulty or incorrectly installed thermostat, which would be a trip to shop that installed it, if it were me.