1999 GMC Safari "replace heater valve" Questions

...FORM REAR HEATER, FROUNT HEATER WORKS OK you eather have a bad fuse or you need a new rear van moter There is a valve up front that controls coolant flow to front and rear heater core. I'd replace

...heater ! you do not have to replace tha thing . its very well made and because you dont turn this often in summer it gets stuck. i had same problem. also make sure vacuum is working - Engine running ...

...checked the heater core and it is clear , Switches seem to work properly ! is there a valve of some sort between the motor and the heater core ? the walve is betven the radiator end the incoming ...

...heater control valve, if used on the model you're working on. Check for presence of a heater control valve by following the heater hoses back to the engine. Sometimes, a vacuum line could have a ...

...replace or flush the heater core multiple times to try and eliminate sediment build-up. Sounds Like Your Head Gasket Smoke Is Cause By Oil In The Fuel. You Can Try Buying Some Head Gasket Repair ...

...replace housing(liquid gasket OK) and coolant. now run engine, turn heater controls to hot leaving filler cap off, top up any water to max and replace cap now warm up to temp until fan comes on. if ...

...have someone adjust temperature from hot to cold and see if you can see the heater control valve operating if so replace the heater core, if its not doing anything replace it(heater control

...replace the heater control valve on the heater hose coming from the water pump. could be the heater core, blockage in the radiator Somewhere there will be a heater control valve on one of the heater ...

...heater core inlet. To replace the control valve, remove the heater core as outlined in this section. Remove the control valve from the heater core, being careful not to damage the core. Use new ...

...heater coil. Take off the thermostat, turn the heater control valve off and on. If it starts working, replace the thermostat. If not, it is probably the heater control valve which will need