I have 1998 cadillac catara. I'm getting no heat from the heater.I have replaced the thermostat,electric pump in the hoses and checked the operation of the vaccum dyapham.The actuator doors seem to be operating properly and I have all the fan modes. Can you please give me any advice as were to look from here.
Has the vacuum diaphragm at the rear of the engine been replaced?
No it has not been replaced. But when vaccum is applied I can feel the hoses getting warmer and the hoses seem to get warm when the engine is running. For your information I'm also having a problem with a reacuring EVAP code.
Okay,the reason I asked is I have seen the heater hoses put on backwards when the hot water valve is replaced causing heater problems.Also there are 2 electric water pumps.The one for the heater core is on the passenger side of the engine,is this the one you replaced.Make sure the radiator cap is holding pressure as this can cause poor coolant flow.With the evap. code it is possible to swap the connectors at the electric water pump with the purge valve connector as they are the exact same connectors.
iac..New problem..heater..Engine temperature is normal.