Question about 1989 Cadillac Seville

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Temp in my 1989 caddy seville 4.5ltr. goes fron 195 to 240 and when it does this the heater starts blowing cold.

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Engine is not full of coolant.

Posted on Jul 03, 2011

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2000 caddy Seville ...after starting and engine warm turn on the heater and it blows cold air. Fan works / waiting for hot air and then all the sudden it kicks in. Engine at normal temp


Low coolant, if there is an air pocket in the engine it will make it to the heater core. Once there , the air coming out is cold/cool. Once the coolant fills the heater core, it gets hot. If the coolant is fine hot or cold, then have the HVAC system scanned.

Oct 09, 2016 | 2000 Cadillac Seville

1 Answer

Heat goes in and out and the temp gauge goes up and down


Your temp sensor has nothing to do with your heater. The temp sensor needs coolant in order to work properly. So first check the coolant level because if it is low your heater will act the way you describe. Once the coolant gets low enough the heater will blow cold. Another possibility is the radiator cap. After the engine has warmed up it expands when it cools down it contracts. As it is contracting if the cap is weak air can be drawn into the system and cause air pockets to form and will cause the same problem

Feb 09, 2013 | 2000 Pontiac Grand Prix

1 Answer

89 cadillac seville temp goes up to 218 then falls back to 186 idling heater want work rightand water goes back to overflow can had to change T-fitting in heater hose does the T have to have the...


You just need to get the engine full of coolant. Disconnect the drivers side hose from the tee and fill motor full of coolant with a funnel until it starts running out of tee.while its cooled down.

Dec 01, 2010 | 1989 Cadillac Seville

1 Answer

Heater blows cold


ok there is a few things might be happening...first did you make sure when you put the intake gaskets in there was No ports plugged or covered...second is...are both heater hoses Cold or is one hot and other cold...if so you have a air lock in the heater core...if this is the problem you need to lossen off the cold one till antifrezze comes out.

Mar 06, 2010 | 1989 GMC Sierra

1 Answer

No heat coming from vents. Only cold air. 1998 caddy seville with climate control. No air coming from front vents at all, only defroster and heater vents.


Fuse has blown in the heater control unit, I had this on my audi last year most likely cause, get youe user manual and loacte the fuse box.

Jan 13, 2010 | 1998 Cadillac Seville

1 Answer

2004 Tahoe Heater Problem


check coolant level ,must be low ,chck for coolant loss

Mar 04, 2009 | 2004 Chevrolet Tahoe

1 Answer

Engine overheats when heater pipes connected


I think you could be right about there being air trapped in the system.
Or the heater core(radiator) is plugged.
Either way you need a pressurized radiator coolant pump to put the coolant in without air being trapped.
Although,i have seen it done by jacking the vehicle up high enough that the radiator was now higher than the heater core level, and then the coolant was put in.
But this is dangerous to try.

Jan 29, 2009 | 1999 Ford Escort

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