Replacing your Jetta heater core involves a figure of steps.
The heater core is mounted under the dashboard on the passenger side of your 1990 Jetta. When you switch on the heater on a biting date, the core produces heat and a fan blows the broiling air into the passenger compartment, warming up the occupants. The heater core is object of the heater meeting that besides includes coolant hoses, blower Engine, ducts and discipline flaps. Air conditioning systems are linked into the heater operation, further, and removing the heater core requires that the A/C refrigerant be discharged professionally before heater core repairs can be done.
Instructions
Remove the Heater Core
1. Extensive the hood of your 1990 Jetta. Loosen and remove the dissension battery cable from the battery using a socket or box wrench.
2. Remove the radiator cap by twisting in a counterclockwise line. District a plastic container under the radiator bleed plug. Loosen the plug at the backside of the radiator with your fingers or with a wrench whether needed and let the coolant void into the plastic container. Loosen and remove the engine block remove plugs with a wrench and permit coolant to withdraw from the engine block into the plastic container.
3. Loosen the hose clamps attached to the heater core on the engine side of the firewall using a screwdriver or wrench. Pull the hoses from the heater core and push the hoses up and away of the plan so they at the end free of charge of dirt and debris.
4. Remove the steering turn trim subsume by prying it off carefully with a extensive flat-head screwdriver. Loosen and remove the airbag retaining screws from the back of the steering rotate with a wrench. Carefully lift the airbag unit from the steering rotate and pull apart the two sides of its electrical connector.
5. Remove the upper and lower steering edge panels by prying them off with a flat-head screwdriver.
6.12. Reattach the instrument cluster electrical connectors and then install the cluster. Reinsert and tighten the screws that you removed earlier. Press the instrument cluster bezel in place and tap it so that the 10 spring clips are joined together again.
Loosen and remove the screws in the center console and left instrument panel tray with a screwdriver. Remove the console and panel tray.
8. Disconnect the speedometer cable from the instrument cluster by reaching behind the cluster, squeezing the clips on the speedometer cable and pulling the cable from the cluster.
9. Detach the 10 spring clips around the instrument cluster bezel by prying the bezel with a flat-head screwdriver. Remove the two screws in the front of the instrument cluster with a screwdriver. Pull the cluster from the dash and disconnect its electrical connectors.
10. Loosen and remove the screws that attach the heater core cover to the heater unit. Lift the heater core cover up. Lift the heater core up and remove it.
Install the Heater Core
11. Install the new or repaired heater core into position. Attach the heater core cover and tighten its screws with a screwdriver.
Loosen and remove the centre steering rotate kernel. Bring about a end on the steering spin and the steering rotate shaft so you'll be able to reinstate the steering wheel to its infant position. Wiggle and tap the steering circle with your artisan until it comes unpaid from the steering wheel shaft.7.
13. Push the speedometer cable into place on the back of the instrument cluster until the clips click into place. Install the center console instrument panel tray and tighten the retaining screws with a screwdriver.
14. Install the steering wheel on to the steering wheel shaft. Use your marks to line up the steering wheel and the shaft to their original position. Tighten the center steering wheel nut with a wrench.
15. Clip the upper and lower steering column panels in place. Install the airbag unit onto the steering wheel and tighten the airbag retaining screws with a wrench. Push the steering wheel cover back into place.
16. Install and tighten the coolant drain plugs on the engine block and radiator. Refill the radiator with coolant through the exposed opening at the top of the radiator. Also, fill the overflow bottle with coolant to the "Fill" line.
17.Reconnect the negative battery cable to the battery and tighten the nut with a wrench. Start the engine and let it run for a few minutes. Check the coolant level by looking into the radiator fill opening. Add more coolant as needed. Install and hand-tighten the radiator cap.
